src
stringlengths 95
64.6k
| complexity
stringclasses 7
values | problem
stringlengths 6
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| from
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.util.Arrays;
import java.util.Comparator;
public class Main {
private static StreamTokenizer in;
private static PrintWriter out;
static {
in = new StreamTokenizer(new BufferedReader(new InputStreamReader(
System.in)));
out = new PrintWriter(System.out);
}
private static int nextInt() throws Exception {
in.nextToken();
return (int) in.nval;
}
private static double nextDouble() throws Exception {
in.nextToken();
return in.nval;
}
private static String nextString() throws Exception {
in.nextToken();
return in.sval;
}
public static void main(String[] args) throws Exception {
int n = nextInt(), k = nextInt(), A = nextInt(), r = n + k - 1;
int[][] s = new int[n][];
for (int i = 0; i < n; i++) {
s[i] = new int[] { nextInt(), nextInt() };
}
double max = 0;
int[] prb = new int[n];
for (int u = (1 << r); u >= 0; u--) {
// проверим на n-1 единичек
int ones = 0;
for (int i = 0; i < r; i++) {
if ((u & (1 << i)) != 0) {
ones++;
}
}
if (ones != n - 1) {
continue;
}
// проверили. расставляем массив
ones = 0;
int p = 0;
for (int i = 0; i < r; i++) {
if ((u & (1 << i)) == 0) {
ones++;
} else {
prb[p] = ones * 10;
p++;
ones = 0;
}
}
prb[p] = ones * 10;
p++;
ones = 0;
double sum = 0;
for (int i = 0; i < n; i++) {
if (prb[i] > 100 - s[i][1])
prb[i] = 100 - s[i][1];
s[i][1] = prb[i] + s[i][1];
}
for (int i = (1 << n) - 1; i >= 0; i--) {
double prob = 1;
int lvl = 0;
int kill = 0;
for (int j = 0; j < n; j++) {
if ((i & (1 << j)) != 0) {
prob *= s[j][1] / 100.0;
kill--;
} else {
lvl += s[j][0];
prob *= (1 - s[j][1] / 100.0);
kill++;
}
}
if (kill >= 0) {
sum += prob * ((double) A / (A + lvl));
} else {
sum += prob;
}
}
for (int i = 0; i < n; i++) {
s[i][1] = -prb[i] + s[i][1];
}
max = Math.max(max, sum);
}
out.println(max);
out.flush();
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.util.*;
import java.io.*;
import java.math.*;
import static java.lang.Math.*;
public class Main{
public void go(){
int n=sc.nextInt(), k=sc.nextInt(), A=sc.nextInt();
ArrayList< ArrayList< Integer > > waysGiveCandies = doit1(n, k, new ArrayList< Integer >());
/*
System.out.printf("%d\n", waysGiveCandies.size());
for(ArrayList< Integer > x : waysGiveCandies){
for(int i : x)
System.out.printf("%d ", i);
System.out.printf("\n");
}
*/
int[] lvl = new int[n], loyal = new int[n];
for(int i=0; i<n; ++i){
lvl[i] = sc.nextInt();
loyal[i] = sc.nextInt();
}
double ret = 0;
for(ArrayList< Integer > distribution : waysGiveCandies){
double[] Loyal = new double[n];
for(int i=0; i<n; ++i) Loyal[i] = min(loyal[i]+10*distribution.get(i), 100)/100.0;
double pWin = 0;
for(int i=0; i<1<<n; ++i){
double pVoteOccurs = 1;
for(int j=0; j<n; ++j)
if((i&(1<<j))!=0) // if winner
pVoteOccurs *= Loyal[j];
else // if loser
pVoteOccurs *= 1-Loyal[j];
int B = 0;
for(int j=0; j<n; ++j) if((i&(1<<j))==0)
B += lvl[j];
double pWinFight = (double)A/(A+B);
// if win vote, don't need to fight
if(bit_count(i)*2 > n)
pWinFight = 1;
pWin += pVoteOccurs * pWinFight;
}
ret = max(ret, pWin);
}
System.out.printf("%.9f\n", ret);
}
ArrayList< ArrayList< Integer > > doit1(int n, int k, ArrayList< Integer > soFar){
ArrayList< ArrayList< Integer > > ret = new ArrayList< ArrayList< Integer > >();
// base case
if(n==1){
soFar.add(k);
ret.add(soFar);
return ret;
}
// general case
for(int i=0; i<k+1; ++i){
ArrayList< Integer > tmp = new ArrayList< Integer >(soFar);
tmp.add(i);
ret.addAll(doit1(n-1, k-i, tmp));
}
return ret;
}
// syntax
// ArrayList<Integer>[] myMat = (ArrayList<Integer>[]) new ArrayList[nB];
// Pairs
public class ii implements Comparable< ii >{
int x, y;
public ii(){}
public ii(int xx, int yy){ x=xx; y=yy; }
public int compareTo(ii p){ return x!=p.x ? x-p.x : y-p.y; }
public int hashCode(){ return 31*x+y; }
public boolean equals(Object o){
if(!(o instanceof ii)) return false;
ii p = (ii) o;
return x==p.x && y==p.y;
}
public String toString(){ return "("+x+", "+y+")"; }
}
/*
public class pair< X extends Comparable< X >,Y extends Comparable< Y > > implements Comparable< pair< X,Y > >{
X x;
Y y;
public pair(){}
public pair(X xx, Y yy){ x=xx; y=yy; }
public int compareTo(pair< X,Y > p){ return x.compareTo(p.x)!=0 ? x.compareTo(p.x) : y.compareTo(p.y); }
public int hashCode(){ return 31*x.hashCode()+y.hashCode(); }
public boolean equals(Object o){
if((o.getClass() != this.getClass())) return false;
pair< X,Y > p = (pair< X,Y >) o;
return x.equals(p.x) && y.equals(p.y);
}
public String toString(){ return "("+x+", "+y+")"; }
}
*/
// my stuff
public static final int INF = 1000*1000*1000+7;
public static final double EPS = 1e-9;
public static final double PI = 2*acos(0.0);
public void rev(Object[] a){ for(int i=0; i<a.length/2; ++i){ Object t=a[i]; a[i]=a[a.length-1-i]; a[a.length-1-i]=t; } }
public void rev(int[] a){ for(int i=0; i<a.length/2; ++i){ int t=a[i]; a[i]=a[a.length-1-i]; a[a.length-1-i]=t; } }
public int bit_count(long x){ return x==0 ? 0 : 1+bit_count(x&(x-1)); }
public int low_bit(int x){ return x&-x; } // 0011 0100 returns 0000 0100
public int sign(int x){ return x<0 ? -1 : x>0 ? 1 : 0; }
public int sign(double x){ return x<-EPS ? -1 : x>EPS ? 1 : 0; }
int[] unpack(ArrayList< Integer > a){
int[] ret = new int[a.size()];
for(int i=0; i<a.size(); ++i) ret[i] = a.get(i);
return ret;
}
// generic main stuff
static myScanner sc;
static PrintWriter pw;
static long startTime;
public static void main(String[] args) throws Exception{
// sc = new Scanner(System.in);
sc = (new Main()).new myScanner(new BufferedReader(new InputStreamReader(System.in)));
pw = new PrintWriter(System.out);
startTime = System.nanoTime();
(new Main()).go();
// errprintln("nanoTime="+(System.nanoTime()-startTime)/1000000/1000.0);
pw.flush();
System.exit(0);
}
// capable of reading 2.86M 6dp doubles per second
// 2.16M 12dp doubles per second
// 2.75M int per second
public class myScanner{
private BufferedReader f;
private StringTokenizer st;
public myScanner(BufferedReader ff){ f=ff; st=new StringTokenizer(""); }
public int nextInt(){ return Integer.parseInt(nextToken()); }
public double nextDouble(){ return Double.parseDouble(nextToken()); }
public String nextLine(){
st=new StringTokenizer("");
String ret="";
try{ ret=f.readLine(); }catch(Exception e){}
return ret;
}
public String nextToken(){
while(!st.hasMoreTokens()) try{ st=new StringTokenizer(f.readLine()); } catch(Exception e){}
return st.nextToken();
}
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
public class ProblemB {
public static int _gnum;
public static int _cnum;
public static int _needs;
public static int _level;
public static double _maxans = 0;
public static double votedfs(int[][] grl, int g, int votes) {
if (votes >= _needs) {
return 1.0d;
}
if (g >= _gnum) {
return 0.0d;
}
double agrees = (double)grl[g][1] / 100;
return agrees * votedfs(grl, g+1, votes+1) + (1.0d - agrees) * votedfs(grl, g+1, votes);
}
public static double battledfs(int[][] grl, int g, int votes, int levels) {
if (votes >= _needs) {
return 0.0d;
}
if (g >= _gnum) {
return (double)_level / (_level + levels);
}
double agrees = (double)grl[g][1] / 100;
return agrees * battledfs(grl, g+1, votes+1, levels) + (1.0d - agrees) * battledfs(grl, g+1, votes, levels + grl[g][0]);
}
public static void candydfs(int[][] grl, int g, int n) {
if (g >= _gnum) {
double na = votedfs(grl, 0, 0) + battledfs(grl, 0, 0, 0);
_maxans = Math.max(_maxans, na);
return;
}
int rem = grl[g][1];
candydfs(grl, g+1, n);
for (int i = 1 ; i <= n ; i++) {
if (grl[g][1] < 100) {
grl[g][1] += 10;
candydfs(grl, g+1, n-i);
}
}
grl[g][1] = rem;
}
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = br.readLine();
String[] d = line.split(" ");
int gnum = Integer.valueOf(d[0]);
int cnum = Integer.valueOf(d[1]);
int level = Integer.valueOf(d[2]);
_gnum = gnum;
_cnum = cnum;
_needs = (gnum + 1) / 2;
if (gnum % 2 == 0) {
_needs += 1;
}
_level = level;
int[][] grl = new int[gnum][2];
for (int g = 0 ; g < gnum ; g++) {
line = br.readLine();
String[] gg = line.split(" ");
grl[g][0] = Integer.valueOf(gg[0]);
grl[g][1] = Integer.valueOf(gg[1]);
}
for (int a = 0 ; a < gnum ; a++) {
for (int b = 0 ; b < gnum - 1 ; b++) {
if (grl[b][1] < grl[b+1][1]) {
int tmp = grl[b][0];
grl[b][0] = grl[b+1][0];
grl[b+1][0] = tmp;
tmp = grl[b][1];
grl[b][1] = grl[b+1][1];
grl[b+1][1] = tmp;
}
}
}
int ag = 0;
int xnum = cnum;
for (int g = 0 ; g < gnum ; g++) {
int needs = (100 - grl[g][1]) / 10;
int roy = 0;
if (needs <= xnum) {
xnum -= needs;
roy = 100;
} else {
roy = grl[g][1] + xnum * 10;
xnum = 0;
}
if (roy >= 100) {
ag++;
}
}
if (ag >= _needs) {
System.out.println(1.0);
return;
}
candydfs(grl, 0, _cnum);
System.out.println(_maxans);
br.close();
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import javax.print.Doc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.*;
public class taskB {
public static void main(String[] args) throws IOException {
new taskB().run();
}
BufferedReader reader;
StringTokenizer tokenizer;
PrintWriter writer;
static String TASK = "";
void run() throws IOException {
try {
// reader = new BufferedReader(new FileReader(TASK + ".in"));
reader = new BufferedReader(new InputStreamReader(System.in));
writer = new PrintWriter(System.out);
// writer = new PrintWriter(TASK + ".out");
tokenizer = null;
solve();
reader.close();
writer.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
int b[];
int l[];
int add[];
int n, k, A;
double ans = 0;
void solve() throws IOException {
n = nextInt();
k = nextInt();
A = nextInt();
b = new int[n];
l = new int[n];
add = new int[n];
for (int i = 0; i < n; ++i) {
b[i] = nextInt();
l[i] = nextInt();
}
brute(0, k);
writer.printf("%.10f", ans);
}
private void brute(int pos, int yet) {
if (pos == n) {
/*double prob[][] = new double[n + 1][n + 1];
prob[0][0] = 1;
for (int i = 1; i <= n; ++i) {
for (int sayYes = 1; sayYes <= i; ++sayYes) {
prob[i][sayYes] = p[i - 1] * prob[i - 1][sayYes - 1];
}
for (int sayYes = 0; sayYes <= i; ++sayYes) {
prob[i][sayYes] = (1 - p[i - 1]) * prob[i - 1][sayYes];
}
}
double nowYes = 0;
for (int i = 0; i <= n; ++i) {
if (i >= (n + 2) / 2 )
nowYes += prob[n][i];
} */
double p[] = new double[n];
for (int i = 0; i < n; ++i) {
p[i] = (l[i] + add[i]) / 100.0;
}
double r = 0;
for (int i =0; i < (1 << n); ++i) {
double pr =1 ;
int sm = 0;
for (int j =0 ; j < n; ++j) {
if ((i & (1 << j)) > 0) {
pr *= p[j];
} else {
pr *= (1 - p[j]);
sm += b[j];
}
}
int c = Integer.bitCount(i);
if (c >= (n + 2) / 2) {
r += pr;
} else {
r += pr * (1.0 * A / (A + sm));
}
}
ans = Math.max(ans, r);
} else {
for (int i = 0; i <= yet; ++i) {
if (l[pos] + 10 * i > 100) continue;
add[pos] = 10 * i;
brute(pos + 1, yet - i);
}
}
}
String nextToken() throws IOException {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
BigInteger nextBigInteger() throws IOException {
return new BigInteger(nextToken());
}
} | np | 105_B. Dark Assembly | CODEFORCES |
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
InputReader in = new InputReader(inputStream);
PrintWriter out = new PrintWriter(outputStream);
TaskB solver = new TaskB();
solver.solve(1, in, out);
out.close();
}
static class TaskB {
double ans = 0;
int[] candy;
int[] b;
int[] l;
int[] curLoyal;
int n;
int k;
int A;
public void solve(int testNumber, InputReader in, PrintWriter out) {
n = in.nextInt();
k = in.nextInt();
A = in.nextInt();
b = new int[n];
l = new int[n];
for (int i = 0; i < n; i++) {
b[i] = in.nextInt();
l[i] = in.nextInt();
}
candy = new int[n];
curLoyal = new int[n];
comb(0, k);
out.println(ans);
}
void comb(int ind, int unusedCandy) {
if (ind == n) {
for (int i = 0; i < n; i++) {
curLoyal[i] = Math.min(candy[i] * 10 + l[i], 100);
}
calc();
} else {
for (int i = 0; i <= unusedCandy; i++) {
candy[ind] = i;
comb(ind + 1, unusedCandy - i);
}
}
}
void calc() {
double res = 0;
int allBits = (1 << n) - 1;
for (int vote = 0; vote <= allBits; vote++) {
double curProb = 1;
int sumPower = A;
int enemyCnt = 0;
for (int voteInd = 0; voteInd < n; voteInd++) {
if ((vote & (1 << voteInd)) == 0) {
curProb *= 100 - curLoyal[voteInd];
sumPower += b[voteInd];
enemyCnt++;
} else {
curProb *= curLoyal[voteInd];
}
curProb /= 100;
}
if (2 * enemyCnt >= n) {
curProb *= A;
curProb /= sumPower;
}
res += curProb;
}
ans = Math.max(ans, res);
}
}
static class InputReader {
private BufferedReader reader;
private StringTokenizer stt;
public InputReader(InputStream stream) {
reader = new BufferedReader(new InputStreamReader(stream));
}
public String nextLine() {
try {
return reader.readLine();
} catch (IOException e) {
return null;
}
}
public String next() {
while (stt == null || !stt.hasMoreTokens()) {
stt = new StringTokenizer(nextLine());
}
return stt.nextToken();
}
public int nextInt() {
return Integer.parseInt(next());
}
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.io.*;
import java.util.*;
public class Main {
StreamTokenizer in;
PrintWriter out;
public static void main(String[] args) throws Exception {
new Main().run();
}
public void run() throws Exception {
Locale.setDefault(Locale.US);
in = new StreamTokenizer (new BufferedReader(new InputStreamReader(System.in)));
out = new PrintWriter(new OutputStreamWriter(System.out));
solve();
out.flush();
}
public int nextInt() throws Exception {
in.nextToken();
return (int) in.nval;
}
public String next() throws Exception {
in.nextToken();
return in.sval;
}
class Senator {
int b;
int l;
public Senator (int b,int l) {
this.b=b;
this.l=l;
}
}
int n,k,A;
double max=Integer.MIN_VALUE;
Senator[] a;
public void check (int step,int candy) {
if (step==n)
{
double tmp = 0.0;
for (int mask=0; mask<(1<<n);mask++)
{
double P = 1.0;
int q = 0;
for (int i=0; i<n;i++)
{
if ((mask>>i&1)!=0)
{
P*=a[i].l/100.;
} else
{
P*=1.0-a[i].l/100.;
q+=a[i].b;
}
}
if (Integer.bitCount(mask)>n/2)
{
tmp+=P;
} else
{
tmp+=P*A/(A+q);
}
max=Math.max(tmp,max);
}
} else
{
for (int i=0;i<=Math.min(k,(100-a[step].l)/10);i++)
{
a[step].l+=10*i;
check(step+1,k-i);
a[step].l-=10*i;
}
}
}
public void solve() throws Exception {
n=nextInt();
k=nextInt();
A=nextInt();
a = new Senator [n];
for (int i=0; i<n;i++) {
Senator q = new Senator(nextInt(),nextInt());
a[i]=q;
}
double ans=0;
for(int mask=0;mask<1<<(n+k-1);mask++)
{
if(Integer.bitCount(mask)!=k) continue;
int[] b = new int[n];
int x = mask;
for(int i=0;i<n;i++)
{
b[i] = a[i].l;
while(x%2==1)
{
b[i]+=10;
x/=2;
}
b[i]=Math.min(b[i],100);
x/=2;
}
double tmp=0;
for(int w=0; w<(1<<n);w++)
{
double p = 1.;
double B = 0;
for(int i = 0; i < n; i++)
if((w >> i & 1) != 0) p *= b[i] / 100.;
else
{
p *= 1- b[i]/100.;
B += a[i].b;
}
if(Integer.bitCount(w)> n/2) tmp += p;
else tmp += p * (A / (A + B));
}
ans = Math.max(ans, tmp);
}
out.printf("%.10f\n", ans);
}
} | np | 105_B. Dark Assembly | CODEFORCES |
import java.io.*;
import java.util.*;
public class TemnayaAssambleya implements Runnable {
public static void main(String[] args) {
new Thread(new TemnayaAssambleya()).run();
}
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer in;
PrintWriter out = new PrintWriter(System.out);
public String nextToken() throws IOException {
while (in == null || !in.hasMoreTokens()) {
in = new StringTokenizer(br.readLine());
}
return in.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
public double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
int[] l;
int[] ln;
int[] pw;
int[] p;
int A;
double max = 0;
public void gen(int n, int k) {
if (n == 0) {
n = p.length;
p[0] = k;
for (int i = 0; i < n; i++) {
ln[i] = l[i] + p[i] * 10;
if (ln[i] > 100)
ln[i] = 100;
}
double ans = 0;
for (int mask = 0; mask < 1 << n; mask++) {
int z = 0;
double pos = 1;
int power = 0;
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) > 0) {
z++;
pos *= ln[i] * 1. / 100;
} else {
pos *= (100 - ln[i]) * 1. / 100;
power += pw[i];
}
}
if (z > n / 2) {
ans += pos;
} else {
ans += pos * A / (A + power);
}
}
max = Math.max(ans, max);
return;
}
for (int i = 0; i <= Math.min(k, 10 - l[n] / 10); i++) {
p[n] = i;
gen(n - 1, k - i);
}
}
public void solve() throws IOException {
int n = nextInt();
int k = nextInt();
A = nextInt();
p = new int[n];
pw = new int[n];
l = new int[n];
ln = new int[n];
for (int i = 0; i < n; i++) {
pw[i] = nextInt();
l[i] = nextInt();
}
gen(n - 1, k);
out.println(max);
}
public void run() {
try {
solve();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class B implements Runnable {
int a;
int[] b;
int[] l;
public void solve() throws IOException {
int n = in.nextInt();
int k = in.nextInt();
a = in.nextInt();
b = new int[n];
l = new int[n];
for ( int i = 0; i < n; i ++ ) {
b[i] = in.nextInt();
l[i] = in.nextInt();
}
out.println( best( 0, k ));
}
double best( int cur, int left ) {
double r = 0.0;
if ( cur < l.length ) {
for ( int i = 0; i <= left && l[cur] + 10 * i <= 100; i ++ ) {
l[cur] += i * 10;
r = Math.max( r, best( cur + 1, left - i ) );
l[cur] -= i * 10;
}
} else {
for ( int m = 0; m < ( 1 << l.length ); m ++ ) {
int sum = 0;
double p = 1.0;
int pro = 0;
for ( int i = 0; i < l.length; i ++ ) {
if ( ( m & ( 1 << i ) ) == 0 ) {
p *= 1.0 - l[i] * 0.01;
sum += b[i];
} else {
p *= l[i] * 0.01;
pro ++;
}
}
if ( pro * 2 > l.length ) {
r += p;
} else {
r += ( p * a ) / ( a + sum );
}
}
}
return r;
}
public Scanner in;
public PrintWriter out;
B() throws IOException {
in = new Scanner(System.in);
// in = new StreamTokenizer( new InputStreamReader( System.in ) );
out = new PrintWriter(System.out);
}
// int nextInt() throws IOException {
// in.nextToken();
// return ( int ) in.nval;
// }
void check(boolean f, String msg) {
if (!f) {
out.close();
throw new RuntimeException(msg);
}
}
void close() throws IOException {
out.close();
}
public void run() {
try {
solve();
close();
} catch (Exception e) {
e.printStackTrace(out);
out.flush();
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws IOException {
new Thread(new B()).start();
}
} | np | 105_B. Dark Assembly | CODEFORCES |
/**
* Created by IntelliJ IDEA.
* User: Taras_Brzezinsky
* Date: 8/13/11
* Time: 6:10 PM
* To change this template use File | Settings | File Templates.
*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.*;
import java.io.IOException;
public class DarkAssembly extends Thread {
public DarkAssembly() {
this.input = new BufferedReader(new InputStreamReader(System.in));
this.output = new PrintWriter(System.out);
this.setPriority(Thread.MAX_PRIORITY);
}
static class Senator {
int loyalty;
int level;
public Senator(int level, int loyalty) {
this.level = level;
this.loyalty = loyalty;
}
}
private static double doIt(Senator[] senators, int A) {
double probability = .0;
for (int mask = 0; mask < (1 << senators.length); ++mask) {
int sum = A;
double current = 1.0;
for (int i = 0; i < senators.length; ++i) {
if ((mask & (1 << i)) != 0) {
current *= .01 * senators[i].loyalty;
} else {
current *= .01 * (100 - senators[i].loyalty);
sum += senators[i].level;
}
}
if (Integer.bitCount(mask) > senators.length / 2) {
probability += current;
} else {
probability += current * (double) A / sum;
}
}
return probability;
}
private static double go(Senator[] senators, int candies, int A, int current) {
if (current == senators.length) {
return doIt(senators, A);
} else {
double result = go(senators, candies, A, current + 1);
if (candies > 0 && senators[current].loyalty < 100) {
senators[current].loyalty += 10;
result = Math.max(result, go(senators, candies - 1, A, current));
senators[current].loyalty -= 10;
}
return result;
}
}
private void solve() throws Throwable {
int n = nextInt();
int k = nextInt();
int A = nextInt();
Senator[] senators = new Senator[n];
for (int i = 0; i < n; ++i) {
senators[i] = new Senator(nextInt(), nextInt());
}
output.printf("%.10f", go(senators, k, A, 0));
}
public void run() {
try {
solve();
} catch (Throwable e) {
System.err.println(e.getMessage());
e.printStackTrace();
} finally {
output.flush();
output.close();
}
}
public static void main(String[] args) {
new DarkAssembly().start();
}
private String nextToken() throws IOException {
while (tokens == null || !tokens.hasMoreTokens()) {
tokens = new StringTokenizer(input.readLine());
}
return tokens.nextToken();
}
private int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
private double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
private long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
private BufferedReader input;
private PrintWriter output;
private StringTokenizer tokens = null;
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.util.Scanner;
public class B {
static int n;
static double A;
static int[] L;
static int[] B;
static double max = 0;
public static void rec(int index, int k) {
if (k < 0)
return;
if (index == n) {
double prob = 0;
for (int i = 0; i < (1 << n); i++) {
double b = 0;
double temp = 1.0;
for (int j = 0; j < n; j++) {
if (L[j] > 100)
return;
if ((i & (1 << j)) == 0) {
b += B[j];
temp *= (100 - L[j]) / 100.0;
} else
temp *= L[j] / 100.0;
}
if (Integer.bitCount(i) * 2 <= n)
temp *= A / (A + b);
prob += temp;
}
max = Math.max(max, prob);
return;
}
L[index] += 10;
rec(index, k - 1);
L[index] -= 10;
rec(index + 1, k);
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
n = in.nextInt();
int k = in.nextInt();
A = in.nextDouble();
B = new int[n];
L = new int[n];
for (int i = 0; i < n; i++) {
B[i] = in.nextInt();
L[i] = in.nextInt();
}
rec(0, k);
System.out.println(max);
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.Map.Entry;
public class Solution implements Runnable {
public static void main(String[] args) {
(new Thread(new Solution())).start();
}
BufferedReader in;
PrintWriter out;
StringTokenizer st;
String nextToken() throws IOException {
while (st == null || !st.hasMoreTokens()) {
String r = in.readLine();
if (r == null) return null;
st = new StringTokenizer(r);
}
return st.nextToken();
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
int n;
int[] b, l;
double ans;
int[] sw;
int a;
void sol() {
for (int i = 0; i < n; i++) l[i] += sw[i] * 10;
double yes = 0;
for (int q = 0; q < (1 << n); q++) {
double p = 1;
int bb = 0;
int cnt = 0;
for (int i = 0; i < n; i++) {
if ((q & (1 << i)) == 0) {
p *= (1.0 - (double)l[i] / 100);
bb += b[i];
} else {
p *= 1.0 * (double)l[i] / 100;
cnt++;
}
}
if (cnt > n / 2) {
yes += p;
} else {
yes += p * (double)a / (double)(a + bb);
}
}
if (ans < yes) ans = yes;
for (int i = 0; i < n; i++) l[i] -= sw[i] * 10;
}
void rek(int i, int k) {
if (i == n) sol(); else {
for (int q = 0; q <= k && l[i] + q * 10 <= 100; q++) {
sw[i] = q;
rek(i + 1, k - q);
}
}
}
void solve() throws Exception {
n = nextInt();
int k = nextInt();
a = nextInt();
b = new int[n];
l = new int[n];
sw = new int[n];
for (int i = 0; i < n; i++) {
b[i] = nextInt();
l[i] = nextInt();
}
rek(0, k);
out.printf("%.10f", ans);
}
public void run() {
Locale.setDefault(Locale.UK);
try {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
// in = new BufferedReader(new FileReader("knights.in"));
// out = new PrintWriter("knights.out");
solve();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
} finally {
out.flush();
}
}
} | np | 105_B. Dark Assembly | CODEFORCES |
import java.io.*;
import java.util.*;
public class B {
BufferedReader br;
PrintWriter out;
StringTokenizer st;
boolean eof;
int[] level;
int[] loyal;
double ans;
int n, k, plLev, needVotes;
double check() {
//System.err.println(Arrays.toString(loyal));
double res = 0;
for (int mask = 0; mask < (1 << n); mask++) {
double prob = 1;
int vote = 0;
int kill = 0;
for (int i = 0; i < n; i++)
if (((mask >> i) & 1) == 1) {
prob *= loyal[i] / 100.0;
vote++;
}
else {
prob *= 1 - loyal[i] / 100.0;
kill += level[i];
}
if (vote >= needVotes)
res += prob;
else
res += prob * plLev / (kill + plLev);
}
return res;
}
void go(int ind, int candy) {
if (ind == n) {
ans = Math.max(ans, check());
return;
}
for (int i = 0; i <= candy; i++) {
loyal[ind] += 10 * i;
if (loyal[ind] > 100) {
loyal[ind] -= 10 * i;
break;
}
go(ind + 1, candy - i);
loyal[ind] -= 10 * i;
}
}
void solve() throws IOException {
n = nextInt();
k = nextInt();
plLev = nextInt();
needVotes = n / 2 + 1;
ans = 0;
level = new int[n];
loyal = new int[n];
for (int i = 0; i < n; i++) {
level[i] = nextInt();
loyal[i] = nextInt();
}
go(0, k);
out.printf("%.12f", ans);
}
void inp() throws IOException {
Locale.setDefault(Locale.US);
br = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
solve();
out.close();
}
public static void main(String[] args) throws IOException {
new B().inp();
}
String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
eof = true;
return "0";
}
}
return st.nextToken();
}
String nextString() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
eof = true;
return "0";
}
}
return st.nextToken("\n");
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.util.*;
import java.io.*;
import static java.lang.Math.*;
public class B{
public static void main(String[] args) throws Exception{
new B().run();
}
double ans = 0;
int n, candy, A, half;
void run() throws Exception{
Scanner sc = new Scanner(System.in);
//BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
// only sc.readLine() is available
n = sc.nextInt();
candy = sc.nextInt();
A = sc.nextInt();
half = n/2;
//int[] level = new int[n];
//int[] loyal = new int[n];
S[] ss = new S[n];
for(int i = 0; i < n; i++){
ss[i] = new S(sc.nextInt(), sc.nextInt());
}
Arrays.sort(ss);
int need = 0;
for(int i = n-1; i >= n-half-1; i--)
need += (100-ss[i].loyal)/10;
if(need <= candy){
System.out.println(1.0);
return;
}
tra(ss, 0, candy);
/*
while(candy > 0){
int ind = 0;
for(int i = 1; i < n; i++)
if(ss[i].loyal < 100 && ss[ind].level < ss[i].level)
ind = i;
ss[ind].loyal += 10;
ss[ind].loyal = min(100, ss[ind].loyal);
candy--;
}
*/
System.out.printf("%.10f\n", ans);
}
void tra(S[] ss, int pos, int rest){
if(pos == n){
double sum = 0;
int lim = 1<<n;
for(int m = 0; m < lim; m++){
int app = Integer.bitCount(m);
double p = 1;
int B = 0;
for(int i = 0; i < n; i++){
if(((m>>i) & 1) == 1){
p = p * ss[i].loyal / 100;
}else{
p = p * (100 - ss[i].loyal) / 100;
B += ss[i].level;
}
}
if(app > half)sum += p;
else{
sum += p * A / (A+B);
}
}
ans = max(ans, sum);
return;
}
for(int i = 0; i <= rest; i++){
int old = ss[pos].loyal;
int nl = ss[pos].loyal + i * 10;
if(nl > 100)break;
ss[pos].loyal = nl;
tra(ss, pos+1, rest-i);
ss[pos].loyal = old;
}
}
}
class S implements Comparable<S>{
int level, loyal;
S(int a, int b){
level = a;
loyal = b;
}
public int compareTo(S s){
return this.loyal - s.loyal;
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
import java.io.*;
import java.util.*;
import java.math.*;
public class Main implements Runnable {
int[] conf, L, B;
int n, k, A, sz;
double[] kill;
double best = 0;
double solv() {
double res = 0;
double[] a = new double[n];
for (int i=0; i<n; i++)
a[i] = Math.min(100, L[i]+10*conf[i])/100.0;
double[] dp1 = new double[sz];
double[] dp2 = new double[sz];
dp1[0] = 1;
for (int i=0; i<n; i++) {
for (int msk=0; msk<sz; msk++) {
dp2[msk] += dp1[msk]*a[i];
dp2[msk|(1<<i)] += dp1[msk]*(1-a[i]);
}
for (int msk=0; msk<sz; msk++) {
dp1[msk] = dp2[msk]; dp2[msk] = 0;
}
}
/*for (int msk=0; msk<sz; msk++) {
double p = 1;
int cnt = 0;
for (int i=0; i<n; i++)
if ((msk&(1<<i))>0) {
p *= (100-a[i])/100.0;
} else {
p *= a[i]/100.0;
cnt++;
}
if (cnt>n/2) res += p; else res += p*kill[msk];
}
res /= sz;*/
for (int msk=0; msk<sz; msk++){
if (n-Integer.bitCount(msk) > n/2) res += dp1[msk]; else res += dp1[msk]*kill[msk];
}
return res;
}
void gen(int n, int k) {
if (n==0) {
conf[0] = k;
//conf[0] = 2; conf[1] = 1; conf[2] = 3;
double x = solv();
if (x>best) best = x;
return;
}
for (int i=0; i<=k; i++) {
conf[n] = i;
gen(n-1, k-i);
}
conf[n] = 0;
}
void solve() throws IOException {
n = nextInt();
k = nextInt();
A = nextInt();
B = new int[n];
L = new int[n];
for (int i=0; i<n; i++) {
B[i] = nextInt();
L[i] = nextInt();
}
sz = 1<<n;
conf = new int[n];
kill = new double[sz];
for (int msk=0; msk<sz; msk++) {
int sum = 0;
for (int i=0; i<n; i++)
if ((msk&(1<<i))>0) {
sum += B[i];
}
kill[msk] = A*1./(A+sum);
}
gen(n-1, k);
out.printf(Locale.US, "%1.9f", best);
}
BufferedReader br;
StringTokenizer st;
PrintWriter out;
public void run() {
try {
br = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
// br = new BufferedReader(new FileReader("input.txt"));
// out = new PrintWriter("output.txt");
solve();
br.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
System.exit(123);
}
}
String next() throws IOException {
while (st == null || !st.hasMoreTokens()) {
String s = br.readLine();
if (s == null)
return null;
st = new StringTokenizer(s,", \t");
}
return st.nextToken();
}
double nextDouble() throws IOException {
return Double.parseDouble(next());
}
int nextInt() throws IOException {
return Integer.parseInt(next());
}
long nextLong() throws IOException {
return Long.parseLong(next());
}
public static void main(String[] args) {
new Thread(new Main()).start();
}
}
| np | 105_B. Dark Assembly | CODEFORCES |
//package contest10D;
import java.math.*;
import java.util.*;
import static java.math.BigInteger.*;
import static java.lang.Math.*;
import static java.util.Arrays.*;
import static java.util.Collections.*;
public class Main {
static void debug(Object... os) {
System.err.println(deepToString(os));
}
public static void main(String[] args) {
new Main().run();
}
void run() {
Scanner sc = new Scanner(System.in);
int n=sc.nextInt(),m=sc.nextInt();
boolean[][] bs=new boolean[n][n];
for (int i = 0; i < m; i++) {
int s=sc.nextInt()-1,t=sc.nextInt()-1;
bs[s][t] = bs[t][s] = true;
}
long res = 0;
for(int i=0;i<n;i++){
res += calc(bs,n-1-i);
}
System.out.println(res/2);
}
long calc(boolean[][] bs,int n){//start is n.
long[][] dp=new long[1<<n][n]; // set,last -> number of path n -> last.
for(int i=0;i<n;i++){
if(bs[i][n])
dp[1<<i][i] ++;
}
for(int i=1;i<1<<n;i++){
for(int j=0;j<n;j++)if(((i>>j)&1)==1)
for(int k=0;k<n;k++)if(((i>>k)&1)==0 && bs[j][k]){//add
dp[i|(1<<k)][k] += dp[i][j];
}
}
long res=0;
for(int i=0;i<1<<n;i++)for(int j=0;j<n;j++)if(Integer.bitCount(i)>=2&&bs[j][n])res+=dp[i][j];
return res;
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.awt.List;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.Locale;
import java.util.TimeZone;
public class Cycle {
public static void main(String[] args) {
Locale.setDefault(Locale.US);
InputStream inputstream = System.in;
OutputStream outputstream = System.out;
FastReader in = new FastReader(inputstream);
PrintWriter out = new PrintWriter(outputstream);
TaskA solver = new TaskA();
// int testcase = in.ni();
for (int i = 0; i < 1; i++)
solver.solve(i, in, out);
out.close();
}
}
class TaskA {
public void solve(int testnumber, FastReader in, PrintWriter out) {
int n = in.ni();
int m = in.ni();
boolean graph[][] = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = in.ni() - 1;
int b = in.ni() - 1;
graph[a][b] = true;
graph[b][a] = true;
}
/*
* dp[mask][i] be the number of Hamiltonian walks over the subset mask,
* starting at the vertex first(mask) and ending at the vertex i
*/
long dp[][] = new long[1 << n][n];
for (int i = 0; i < n; i++) {
dp[1 << i][i] = 1;
}
long answer = 0;
for (int mask = 1; mask < (1 << n); mask++) {
int start = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) == 0) {
continue;
}
for (int j = start + 1; j < n; j++) {
if (graph[i][j] && (mask & (1 << j)) == 0) {
dp[mask + (1 << j)][j] += dp[mask][i];
}
}
if (graph[i][start]) {
answer += dp[mask][i];
}
}
}
out.println((answer - m) / 2);
}
}
class FastReader {
public InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private SpaceCharFilter filter;
public FastReader(InputStream stream) {
this.stream = stream;
}
public FastReader() {
}
public int read() {
if (numChars == -1) {
throw new InputMismatchException();
}
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0) {
return -1;
}
}
return buf[curChar++];
}
public int ni() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9') {
throw new InputMismatchException();
}
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public String ns() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
public boolean isSpaceChar(int c) {
if (filter != null) {
return filter.isSpaceChar(c);
}
return isWhitespace(c);
}
public static boolean isWhitespace(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public int[] iArr(int n) {
int a[] = new int[n];
for (int i = 0; i < n; i++) {
a[i] = ni();
}
return a;
}
public String next() {
return ns();
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*
* @author Darshandarji
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
InputReader in = new InputReader(inputStream);
PrintWriter out = new PrintWriter(outputStream);
TaskD solver = new TaskD();
solver.solve(1, in, out);
out.close();
}
static class TaskD {
public void solve(int testNumber, InputReader in, PrintWriter out) {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] g = new boolean[n][n];
for (int i = 0; i < m; ++i) {
int a = in.nextInt() - 1;
int b = in.nextInt() - 1;
g[a][b] = true;
g[b][a] = true;
}
/*for (int i = 0; i < n; ++i)
for (int j = 0; j < n; ++j)
g[i][j] = true;*/
long[] am = new long[n + 1];
long[][] ways = new long[1 << n][n];
for (int start = 0; start < n; ++start) {
for (int mask = 0; mask < (1 << (n - start)); ++mask)
for (int last = start; last < n; ++last) {
ways[mask][last - start] = 0;
}
ways[1][0] = 1;
for (int mask = 0; mask < (1 << (n - start)); ++mask) {
int cnt = 0;
int tmp = mask;
while (tmp > 0) {
++cnt;
tmp = tmp & (tmp - 1);
}
for (int last = start; last < n; ++last)
if (ways[mask][last - start] > 0) {
long amm = ways[mask][last - start];
for (int i = start; i < n; ++i)
if ((mask & (1 << (i - start))) == 0 && g[last][i]) {
ways[mask | (1 << (i - start))][i - start] += amm;
}
if (g[last][start])
am[cnt] += ways[mask][last - start];
}
}
}
long res = 0;
for (int cnt = 3; cnt <= n; ++cnt) {
if (am[cnt] % (2) != 0)
throw new RuntimeException();
res += am[cnt] / (2);
}
out.println(res);
}
}
static class InputReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private InputReader.SpaceCharFilter filter;
public InputReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int nextInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
}
while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
/**
* Created by Tejas on 18-10-2018.
*/
public class Main {
static HashSet<Integer> adjList[];
public static void main(String[]args)throws IOException{
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(System.in));
StringBuilder stringBuilder=new StringBuilder();
String temp[]=bufferedReader.readLine().split(" ");
int V=Integer.parseInt(temp[0]);
int E=Integer.parseInt(temp[1]);
adjList=new HashSet[V];
for(int i=0;i<V;i++)
adjList[i]=new HashSet<>();
for(int i=0;i<E;i++){
temp=bufferedReader.readLine().split(" ");
int x=Integer.parseInt(temp[0])-1;
int y=Integer.parseInt(temp[1])-1;
adjList[y].add(x);
adjList[x].add(y);
}
stringBuilder.append(solve(V)+"\n");
System.out.println(stringBuilder);
}
private static long solve(int V) {
long dp[][]=new long[(1<<V)][V];
long count=0;
for(int i=0;i<V;i++)
dp[(1<<i)][i]=1;
for(int mask=1;mask<(1<<V);mask++){
// HW starting at pos first and ending at j.
int first = Integer.numberOfTrailingZeros(mask);
for(int i=0;i<V;i++){
if((mask&(1<<i))==0 || first==i) continue;
for (int j = 0; j < V; j++)
if (adjList[i].contains(j) && (mask & (1<<j))!=0)
dp[mask][i] += dp[mask ^ (1 << i)][j];
//Calculating simple cycles
if (Integer.bitCount(mask)>=3)
if(adjList[first].contains(i))
count+=dp[mask][i];
}
}
return count/2;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.util.ArrayList;
import java.io.InputStream;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*
* @author Alex
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
InputReader in = new InputReader(inputStream);
OutputWriter out = new OutputWriter(outputStream);
TaskD solver = new TaskD();
solver.solve(1, in, out);
out.close();
}
static class TaskD {
int n;
ArrayList<Integer>[] adj;
long[] mem;
int start;
long cycles(int cur, int visited) {
if (cur == start && visited > 0) {
return Integer.bitCount(visited) >= 3 ? 1 : 0;
}
int index = visited * n + cur;
if (mem[index] != -1) return mem[index];
long res = 0;
int newvisited = visited | (1 << cur);
for (int nxt : adj[cur]) {
if (nxt >= start && (nxt == start || ((visited >> nxt) & 1) == 0)) {
res += cycles(nxt, newvisited);
}
}
return mem[index] = res;
}
public void solve(int testNumber, InputReader in, OutputWriter out) {
n = in.readInt();
int m = in.readInt();
adj = new ArrayList[n];
mem = new long[n * (1 << n)];
for (int i = 0; i < adj.length; i++) adj[i] = new ArrayList<>();
for (int i = 0; i < m; i++) {
int a = in.readInt() - 1, b = in.readInt() - 1;
adj[a].add(b);
adj[b].add(a);
}
long res = 0;
for (int start = 0; start < n; start++) {
Arrays.fill(mem, -1);
this.start = start;
res += cycles(start, 0) / 2;
}
out.printLine(res);
}
}
static class OutputWriter {
private final PrintWriter writer;
public OutputWriter(OutputStream outputStream) {
writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
}
public OutputWriter(Writer writer) {
this.writer = new PrintWriter(writer);
}
public void close() {
writer.close();
}
public void printLine(long i) {
writer.println(i);
}
}
static class InputReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private InputReader.SpaceCharFilter filter;
public InputReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int readInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return isWhitespace(c);
}
public static boolean isWhitespace(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
new Main().run();
}
boolean[][] graph;
public void run() {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
graph = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = sc.nextInt() - 1;
int b = sc.nextInt() - 1;
graph[a][b] = true;
graph[b][a] = true;
}
long res = 0;
for (int i = 3; i <= n; i++) {
res += solve(i);
}
System.out.println(res);
}
long solve(int n) {
// [0, n)の頂点だけで、n-1 スタートだけ考える
long[][] dp = new long[1 << n][n];
dp[1 << (n-1)][n-1] = 1;
for (int i = 0; i < (1 << n); ++i) {
for (int l = 0; l < n; ++l) if (dp[i][l] > 0) {
for (int x = 0; x < n - 1; ++x) if (graph[l][x] && (i >> x & 1) == 0) {
dp[i | (1 << x)][x] += dp[i][l];
}
}
}
long res = 0;
for (int i = 0; i < (1 << n); ++i) if (Integer.bitCount(i) >= 3) {
for (int l = 0; l < n; ++l) {
if (graph[l][n-1]) res += dp[i][l];
}
}
return res / 2; // n-1 を含むサイクルを右回りと左回り数えてしまったので２で割る
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int m = in.nextInt();
boolean[][] graph = new boolean[n][n];
for(int i = 0; i < m; i++) {
int from = in.nextInt() - 1;
int to = in.nextInt() - 1;
graph[from][to] = true;
graph[to][from] = true;
}
int max = 1 << n;
long[][] dp = new long[max][n];
for(int mask = 1; mask < max; mask++) {
for(int i = 0; i < n; i++) {
int countMask = Integer.bitCount(mask);
boolean existSubSeti = (mask & (1 << i)) > 0;
if(countMask == 1 && existSubSeti) {
dp[mask][i] = 1;
}
else if(countMask > 1 && existSubSeti) {
int mask1 = mask ^ (1 << i);
for(int j = 0; j < n; j++) {
if(((mask1 & (1 << j)) > 0) && graph[j][i] && i != firstMask(mask, n)) {
dp[mask][i] += dp[mask1][j];
}
}
}
}
}
long counter = 0;
for(int mask = 1; mask < max; mask++) {
for(int i = 0; i < n; i++) {
if(Integer.bitCount(mask) >= 3 && graph[firstMask(mask, n)][i]) {
counter += dp[mask][i];
}
}
}
System.out.println(counter / 2);
in.close();
}
public static int firstMask(int mask, int n) {
for(int i = 0; i < n; i++) {
if((mask & (1 << i)) > 0) return i;
}
return -1;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
public class Solution {
public void doMain() throws Exception {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt(), m = sc.nextInt();
boolean[][] adj = new boolean[n][n];
for (int i=0; i<m; i++) {
int a = sc.nextInt()-1, b = sc.nextInt()-1;
adj[a][b] = adj[b][a] = true;
}
long res = 0;
for (int st=0; st+1<n; st++) {
//System.out.println("st="+st);
long[][] numWays = new long[1<<(n-st-1)][n-st-1];
for (int i=st+1; i<n; i++)
if (adj[st][i]) numWays[1<<(i-st-1)][i-st-1] = 1;
for (int mask=1; mask < (1<<(n-st-1)); mask++) {
boolean simple = ((mask & (mask-1)) == 0);
for (int last=0; last<n-st-1; last++) if (numWays[mask][last]!=0) {
if (adj[last+st+1][st] && !simple) res += numWays[mask][last];
for (int next=0; next<n-st-1; next++)
if (adj[last+st+1][next+st+1] && (mask & (1<<next)) == 0)
numWays[mask | (1<<next)][next] += numWays[mask][last];
}
}
}
System.out.println(res/2);
}
public static void main(String[] args) throws Exception {
(new Solution()).doMain();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int m = in.nextInt();
boolean[][] graph = new boolean[n][n];
for(int i = 0; i < m; i++) {
int from = in.nextInt() - 1;
int to = in.nextInt() - 1;
graph[from][to] = true;
graph[to][from] = true;
}
int max = 1 << n;
long[][] dp = new long[max][n];
for(int mask = 1; mask < max; mask++) {
for(int i = 0; i < n; i++) {
int countMask = Integer.bitCount(mask);
boolean existSubSeti = (mask & (1 << i)) > 0;
if(countMask == 1 && existSubSeti) {
dp[mask][i] = 1;
}
else if(countMask > 1 && existSubSeti) {
int mask1 = mask ^ (1 << i);
for(int j = 0; j < n; j++) {
if(graph[j][i] && i != firstMask(mask, n)) {
dp[mask][i] += dp[mask1][j];
}
}
}
}
}
long counter = 0;
for(int mask = 1; mask < max; mask++) {
for(int i = 0; i < n; i++) {
if(Integer.bitCount(mask) >= 3 && graph[firstMask(mask, n)][i]) {
counter += dp[mask][i];
}
}
}
System.out.println(counter / 2);
in.close();
}
public static int firstMask(int mask, int n) {
for(int i = 0; i < n; i++) {
if((mask & (1 << i)) > 0) return i;
}
return -1;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Arrays;
/**
* Created by IntelliJ IDEA.
* User: piyushd
* Date: 12/31/10
* Time: 1:30 PM
* To change this template use File | Settings | File Templates.
*/
public class SimpleCycle {
int first(int x){
return x - (x & (x - 1));
}
void run(){
int N = nextInt(), M = nextInt();
int[] graph = new int[N];
for(int i = 0; i < M; i++){
int a = nextInt() - 1, b = nextInt() - 1;
graph[a] |= (1<<b);
graph[b] |= (1<<a);
}
int[] bitcount = new int[1<<N];
for(int i = 0; i < (1<<N); i++){
bitcount[i] = bitcount[i>>1];
if(i % 2 == 1) bitcount[i]++;
}
long[][] dp = new long[1<<N][N];
for(long[] f : dp) Arrays.fill(f, 0);
long ans = 0;
for(int mask = 1; mask < (1<<N); mask++){
for(int i = 0; i < N; i++)if((mask & (1<<i)) > 0){
if(bitcount[mask] == 1) dp[mask][i] = 1;
else{
if(first(mask) != (1<<i)){
for(int j = 0; j < N; j++)if((graph[i] & (1<<j)) > 0 && (mask & (1<<j)) > 0){
dp[mask][i] += dp[mask - (1<<i)][j];
}
}
}
if(bitcount[mask] >= 3 && (graph[i] & first(mask)) > 0) ans += dp[mask][i];
}
}
System.out.println(ans / 2);
}
int nextInt(){
try{
int c = System.in.read();
if(c == -1) return c;
while(c != '-' && (c < '0' || '9' < c)){
c = System.in.read();
if(c == -1) return c;
}
if(c == '-') return -nextInt();
int res = 0;
do{
res *= 10;
res += c - '0';
c = System.in.read();
}while('0' <= c && c <= '9');
return res;
}catch(Exception e){
return -1;
}
}
long nextLong(){
try{
int c = System.in.read();
if(c == -1) return -1;
while(c != '-' && (c < '0' || '9' < c)){
c = System.in.read();
if(c == -1) return -1;
}
if(c == '-') return -nextLong();
long res = 0;
do{
res *= 10;
res += c-'0';
c = System.in.read();
}while('0' <= c && c <= '9');
return res;
}catch(Exception e){
return -1;
}
}
double nextDouble(){
return Double.parseDouble(next());
}
String next(){
try{
StringBuilder res = new StringBuilder("");
int c = System.in.read();
while(Character.isWhitespace(c))
c = System.in.read();
do{
res.append((char)c);
}while(!Character.isWhitespace(c=System.in.read()));
return res.toString();
}catch(Exception e){
return null;
}
}
String nextLine(){
try{
StringBuilder res = new StringBuilder("");
int c = System.in.read();
while(c == '\r' || c == '\n')
c = System.in.read();
do{
res.append((char)c);
c = System.in.read();
}while(c != '\r' && c != '\n');
return res.toString();
}catch(Exception e){
return null;
}
}
public static void main(String[] args){
new SimpleCycle().run();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class ProblemD {
static int N;
static boolean[][] graph;
public static void main(String[] args) throws IOException {
BufferedReader s = new BufferedReader(new InputStreamReader(System.in));
PrintWriter out = new PrintWriter(System.out);
String[] data = s.readLine().split(" ");
int n = Integer.valueOf(data[0]);
N = n;
int m = Integer.valueOf(data[1]);
graph = new boolean[n][n];
for (int i = 0 ; i < m ; i++) {
String[] line = s.readLine().split(" ");
int a = Integer.valueOf(line[0])-1;
int b = Integer.valueOf(line[1])-1;
graph[a][b] = true;
graph[b][a] = true;
}
long ans = 0;
for (int i = 0 ; i < n ; i++) {
ans += doit(i);
}
ans /= 2;
out.println(ans);
out.flush();
}
static long doit(int n) {
long[][] dp = new long[1<<n][n];
for (int i = 0 ; i < n ; i++) {
if (graph[i][n]) {
dp[1<<i][i] = 1;
}
}
for (int i = 0 ; i < (1<<n) ; i++) {
for (int j = 0 ; j < n ; j++) {
if (dp[i][j] >= 1) {
for (int k = 0 ; k < n ; k++) {
if (graph[j][k] && (i & (1<<k)) == 0) {
dp[i|1<<k][k] += dp[i][j];
}
}
}
}
}
long ret = 0;
for (int i = 0 ; i < (1<<n) ; i++) {
if (Integer.bitCount(i) >= 2) {
for (int j = 0 ; j < n ; j++) {
if (graph[j][n]) {
ret += dp[i][j];
}
}
}
}
return ret;
}
static void generateLarge() {
System.out.println("19 171");
for (int i = 1 ; i <= 19 ; i++) {
for (int j = i+1 ; j <= 19 ; j++) {
System.out.println(i + " " + j);
}
}
}
public static void debug(Object... os){
System.err.println(Arrays.deepToString(os));
}
} | np | 11_D. A Simple Task | CODEFORCES |
/**
* JUDGE_ID : 104262PN
* User : Денис
* Date : 09.05.11
* Time : 22:48
* ICQ : 785625
* Email : popokus@gmail.com
*/
import java.io.*;
public class s11_d {
public static void main(String[] args) throws IOException {
new s11_d().run();
}
int nextInt() throws IOException {
in.nextToken();
return (int) in.nval;
}
String nextString() throws IOException {
in.nextToken();
return (String) in.sval;
}
StreamTokenizer in;
Writer writer;
Reader reader;
void run() throws IOException {
boolean oj = System.getProperty("ONLINE_JUDGE") != null;
reader = oj ? new InputStreamReader(System.in, "ISO-8859-1") : new FileReader("input/is11_d.txt");
writer = new OutputStreamWriter(System.out, "ISO-8859-1");
in = new StreamTokenizer(new BufferedReader(reader));
PrintWriter out = new PrintWriter(writer);
int n = nextInt();
int e = nextInt();
boolean[][] is = new boolean[n + 1][n + 1];
for (int i = 0; i < e;i++) {
int a = nextInt() - 1;
int b = nextInt() - 1;
is[a][b] = true;
is[b][a] = true;
}
// calculating dp
long[] am = new long[n + 1];
long[][] ways = new long[1 << (n - 1)][n];
for (int start = 0; start < n; ++start) {
for (int mask = 0; mask < (1 << (n - start - 1)); ++mask)
for (int last = start; last < n; ++last) {
ways[mask][last - start] = 0;
}
ways[1 >> 1][0] = 1;
for (int mask = 1; mask < (1 << (n - start)); mask += 2) {
int cnt = 0;
int tmp = mask;
while (tmp > 0) {
++cnt;
tmp = tmp & (tmp - 1);
}
for (int last = start; last < n; ++last)
if (ways[mask >> 1][last - start] > 0) {
long amm = ways[mask >> 1][last - start];
for (int i = start; i < n; ++i)
if ((mask & (1 << (i - start))) == 0 && is[last][i]) {
ways[(mask | (1 << (i - start))) >> 1][i - start] += amm;
}
if (is[last][start])
am[cnt] += ways[mask >> 1][last - start];
}
}
}
long res = 0;
for (int cnt = 3; cnt <= n; ++cnt) {
if (am[cnt] % (2) != 0)
throw new RuntimeException();
res += am[cnt] / (2);
}
out.println(res);
out.flush();
out.close();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class SimpleTask {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
int m = scan.nextInt();
boolean[][] graph = new boolean[n][n];
for (int i = 0; i < m; i++) {
int u = scan.nextInt() - 1;
int v = scan.nextInt() - 1;
graph[u][v] = true;
graph[v][u] = true;
}
long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; i++)
dp[1 << i][i] = 1;
for (int mask = 1; mask < (1 << n); mask++) {
int first = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) == 0 || first == i)
continue;
for (int j = 0; j < n; j++) {
if (graph[i][j])
dp[mask][i] += dp[mask ^ 1 << i][j];
}
}
}
long answer = 0;
for (int mask = 1; mask < (1 << n); mask++) {
if (Integer.bitCount(mask) < 3)
continue;
int first = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if (graph[first][i])
answer += dp[mask][i];
}
}
System.out.println(answer / 2);
scan.close();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class CF {
void realSolve() {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] f = new boolean[n][n];
for (int i = 0; i < m; i++) {
int fr = in.nextInt() - 1;
int to = in.nextInt() - 1;
f[fr][to] = f[to][fr] = true;
}
long[][] dp = new long[n][1 << n];
for (int i = 0; i < n; i++)
dp[i][1 << i] = 1;
long res = 0;
int[] len = new int[n + 1];
for (int st = 0; st < 1 << n; st++) {
int from = Integer.lowestOneBit(st);
for (int i =0; i < n;i++)
if (((1<<i) & st) != 0) {
from =i;
break;
}
for (int to = 0; to < n; to++)
if (dp[to][st] != 0)
for (int next = from; next < n; next++)
if (f[to][next]
&& ((((1 << next) & st) == 0) || next == from))
if (next == from) {
if (Integer.bitCount(st) > 2) {
res += dp[to][st];
len[Integer.bitCount(st)] += dp[to][st];
}
} else {
dp[next][st | (1 << next)] += dp[to][st];
}
}
out.println(res / 2);
}
private class InputReader {
StringTokenizer st;
BufferedReader br;
public InputReader(File f) {
try {
br = new BufferedReader(new FileReader(f));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
public InputReader(InputStream f) {
br = new BufferedReader(new InputStreamReader(f));
}
String next() {
while (st == null || !st.hasMoreElements()) {
String s;
try {
s = br.readLine();
} catch (IOException e) {
return null;
}
if (s == null)
return null;
st = new StringTokenizer(s);
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
double nextDouble() {
return Double.parseDouble(next());
}
boolean hasMoreElements() {
while (st == null || !st.hasMoreElements()) {
String s;
try {
s = br.readLine();
} catch (IOException e) {
return false;
}
st = new StringTokenizer(s);
}
return st.hasMoreElements();
}
long nextLong() {
return Long.parseLong(next());
}
}
InputReader in;
PrintWriter out;
void solve() {
in = new InputReader(new File("object.in"));
try {
out = new PrintWriter(new File("object.out"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
realSolve();
out.close();
}
void solveIO() {
in = new InputReader(System.in);
out = new PrintWriter(System.out);
realSolve();
out.close();
}
public static void main(String[] args) {
new CF().solveIO();
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class SimpleTask {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
int m = scan.nextInt();
boolean[][] graph = new boolean[n][n];
for (int i = 0; i < m; i++) {
int u = scan.nextInt() - 1;
int v = scan.nextInt() - 1;
graph[u][v] = true;
graph[v][u] = true;
}
long[][] dp = new long[1 << n][n];
long sum = 0;
for (int i = 0; i < n; i++)
dp[1 << i][i] = 1;
for (int mask = 1; mask < (1 << n); mask++) {
int first = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) == 0 || first == i)
continue;
for (int j = 0; j < n; j++) {
if (graph[i][j] && (mask & (1 << j)) != 0)
dp[mask][i] += dp[mask ^ 1 << i][j];
}
if (Integer.bitCount(mask) >= 3 && graph[i][first])
sum += dp[mask][i];
}
}
System.out.println(sum / 2);
scan.close();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int m=sc.nextInt();
int x,y;
boolean graph[][]=new boolean[n][n];
for(int i=0;i<m;i++){
x=sc.nextInt()-1;
y=sc.nextInt()-1;
graph[x][y]=graph[y][x]=true;
}
long dp[][]=new long[1<<n][n];
long res=0;
for(int i=0;i<n;i++){
dp[1<<i][i]=1;
}
for(int mask=1;mask<(1<<n);mask++){
int first=-1;
for(int f=0;f<n;f++){
if((mask&(1<<f))!=0){
first=f;
break;
}
}
for(int i=0;i<n;i++){
if((mask&(1<<i))!=0&&i!=first){
for(int j=0;j<n;j++){
if(graph[j][i]&&((mask&1<<j)!=0)){
dp[mask][i]+=dp[mask^1<<i][j];
}
}
}
if(Integer.bitCount(mask)>2&&graph[first][i]){
res+=dp[mask][i];
}
}
}
System.out.println(res/2);
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.lang.*;
public class P11D{
static long mod=1000000007;
public static void main(String[] args) throws Exception{
InputReader in = new InputReader(System.in);
PrintWriter pw=new PrintWriter(System.out);
//int t=in.readInt();
//while(t-->0)
//{
int n=in.readInt();
int m=in.readInt();
boolean v[][]=new boolean[n][n];
for(int i=0;i<m;i++)
{
int x=in.readInt()-1;
int y=in.readInt()-1;
v[x][y]=true;
v[y][x]=true;
}
long dp[][]=new long[1<<n][n];
for(int i=0;i<n;i++)
{
dp[1<<i][i]=1;
}
long ans=0;
for(int mask=1;mask<(1<<n);mask++)
{
int s=-1;
for(int i=0;i<n;i++)
{
if((mask&(1<<i))!=0)
{
s=i;
break;
}
}
for(int i=0;i<n;i++)
{
if(i!=s&&((1<<i)&mask)!=0)
{
for(int j=0;j<n;j++)
{
if((1<<j)!=0&&i!=j&&v[i][j])
{
int rem=(1<<i)^mask;
dp[mask][i]+=dp[rem][j];
}
}
int c=Integer.bitCount(mask);
if(c>=3&&v[i][s])
{
ans+=dp[mask][i];
}
}
}
}
ans/=2;
pw.println(ans);
//}
pw.close();
}
public static long gcd(long x,long y)
{
if(x%y==0)
return y;
else
return gcd(y,x%y);
}
public static int gcd(int x,int y)
{
if(x%y==0)
return y;
else
return gcd(y,x%y);
}
public static int abs(int a,int b)
{
return (int)Math.abs(a-b);
}
public static long abs(long a,long b)
{
return (long)Math.abs(a-b);
}
public static int max(int a,int b)
{
if(a>b)
return a;
else
return b;
}
public static int min(int a,int b)
{
if(a>b)
return b;
else
return a;
}
public static long max(long a,long b)
{
if(a>b)
return a;
else
return b;
}
public static long min(long a,long b)
{
if(a>b)
return b;
else
return a;
}
public static long pow(long n,long p,long m)
{
long result = 1;
if(p==0)
return 1;
if (p==1)
return n;
while(p!=0)
{
if(p%2==1)
result *= n;
if(result>=m)
result%=m;
p >>=1;
n*=n;
if(n>=m)
n%=m;
}
return result;
}
public static long pow(long n,long p)
{
long result = 1;
if(p==0)
return 1;
if (p==1)
return n;
while(p!=0)
{
if(p%2==1)
result *= n;
p >>=1;
n*=n;
}
return result;
}
static class Pair implements Comparable<Pair>
{
int a,b;
Pair (int a,int b)
{
this.a=a;
this.b=b;
}
public int compareTo(Pair o) {
// TODO Auto-generated method stub
if(this.a!=o.a)
return Integer.compare(this.a,o.a);
else
return Integer.compare(this.b, o.b);
//return 0;
}
public boolean equals(Object o) {
if (o instanceof Pair) {
Pair p = (Pair)o;
return p.a == a && p.b == b;
}
return false;
}
public int hashCode() {
return new Integer(a).hashCode() * 31 + new Integer(b).hashCode();
}
}
static long sort(int a[])
{ int n=a.length;
int b[]=new int[n];
return mergeSort(a,b,0,n-1);}
static long mergeSort(int a[],int b[],long left,long right)
{ long c=0;if(left<right)
{ long mid=left+(right-left)/2;
c= mergeSort(a,b,left,mid);
c+=mergeSort(a,b,mid+1,right);
c+=merge(a,b,left,mid+1,right); }
return c; }
static long merge(int a[],int b[],long left,long mid,long right)
{long c=0;int i=(int)left;int j=(int)mid; int k=(int)left;
while(i<=(int)mid-1&&j<=(int)right)
{ if(a[i]<=a[j]) {b[k++]=a[i++]; }
else { b[k++]=a[j++];c+=mid-i;}}
while (i <= (int)mid - 1) b[k++] = a[i++];
while (j <= (int)right) b[k++] = a[j++];
for (i=(int)left; i <= (int)right; i++)
a[i] = b[i]; return c; }
public static int[] radixSort(int[] f)
{
int[] to = new int[f.length];
{
int[] b = new int[65537];
for(int i = 0;i < f.length;i++)b[1+(f[i]&0xffff)]++;
for(int i = 1;i <= 65536;i++)b[i]+=b[i-1];
for(int i = 0;i < f.length;i++)to[b[f[i]&0xffff]++] = f[i];
int[] d = f; f = to;to = d;
}
{
int[] b = new int[65537];
for(int i = 0;i < f.length;i++)b[1+(f[i]>>>16)]++;
for(int i = 1;i <= 65536;i++)b[i]+=b[i-1];
for(int i = 0;i < f.length;i++)to[b[f[i]>>>16]++] = f[i];
int[] d = f; f = to;to = d;
}
return f;
}
static class InputReader
{
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private SpaceCharFilter filter;
public InputReader(InputStream stream)
{
this.stream = stream;
}
public int read()
{
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars)
{
curChar = 0;
try
{
numChars = stream.read(buf);
} catch (IOException e)
{
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int readInt()
{
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-')
{
sgn = -1;
c = read();
}
int res = 0;
do
{
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public String readString()
{
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do
{
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
public String readLine() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isEndOfLine(c));
return res.toString();
}
public double readDouble() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
double res = 0;
while (!isSpaceChar(c) && c != '.') {
if (c == 'e' || c == 'E')
return res * Math.pow(10, readInt());
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
}
if (c == '.') {
c = read();
double m = 1;
while (!isSpaceChar(c)) {
if (c == 'e' || c == 'E')
return res * Math.pow(10, readInt());
if (c < '0' || c > '9')
throw new InputMismatchException();
m /= 10;
res += (c - '0') * m;
c = read();
}
}
return res * sgn;
}
public long readLong() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
long res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c)
{
if (filter != null)
return filter.isSpaceChar(c);
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public String next()
{
return readString();
}
public interface SpaceCharFilter
{
public boolean isSpaceChar(int ch);
}
public boolean isEndOfLine(int c) {
return c == '\n' || c == '\r' || c == -1;
}
}
//BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
//StringBuilder sb=new StringBuilder("");
//InputReader in = new InputReader(System.in);
//PrintWriter pw=new PrintWriter(System.out);
//String line=br.readLine().trim();
//int t=Integer.parseInt(br.readLine());
// while(t-->0)
//{
//int n=Integer.parseInt(br.readLine());
//long n=Long.parseLong(br.readLine());
//String l[]=br.readLine().split(" ");
//int m=Integer.parseInt(l[0]);
//int k=Integer.parseInt(l[1]);
//String l[]=br.readLine().split(" ");
//l=br.readLine().split(" ");
/*int a[]=new int[n];
for(int i=0;i<n;i++)
{
a[i]=Integer.parseInt(l[i]);
}*/
//System.out.println(" ");
//}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
for (int i = 0; i < n; ++i) {
for (int j = i + 1; j < n; ++j) {
if (adj[i][j]) {
--res;
}
}
}
for (int i = 0; i < n; ++i) {
long[][] dp = new long[1 << (n - i)][n - i];
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
if (dp[mask][j] != 0) {
for (int k = 0; k < n - i; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += dp[mask][j];
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[mask][0];
}
}
}
out.println(res / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
int m = scan.nextInt();
boolean[][] graph = new boolean[n][n];
for (int i = 0; i < m; i++) {
int u = scan.nextInt() - 1;
int v = scan.nextInt() - 1;
graph[u][v] = true;
graph[v][u] = true;
}
long[][] dp = new long[1 << n][n];
long sum = 0;
for (int i = 0; i < n; i++)
dp[1 << i][i] = 1;
for (int mask = 1; mask < (1 << n); mask++) {
int first = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) == 0 || first == i)
continue;
for (int j = 0; j < n; j++) {
if (graph[i][j] && (mask & (1 << j)) != 0)
dp[mask][i] += dp[mask ^ 1 << i][j];
}
if (Integer.bitCount(mask) >= 3 && graph[i][first])
sum += dp[mask][i];
}
}
System.out.println(sum / 2);
scan.close();
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.InputMismatchException;
/**
* @author Egor Kulikov (egor@egork.net)
* Created on 14.03.2010
*/
public class TaskD implements Runnable {
private InputReader in;
private PrintWriter out;
private int n;
private int m;
private boolean[][] e;
private long[][] qp;
private static class InputReader {
private InputStream stream;
private byte[] buf = new byte[1000];
private int curChar, numChars;
public InputReader(InputStream stream) {
this.stream = stream;
}
private int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int readInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public long readLong() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
long res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public String readString() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuffer res = new StringBuffer();
do {
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
private boolean isSpaceChar(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
private String readLine0() {
StringBuffer buf = new StringBuffer();
int c = read();
while (c != '\n' && c != -1) {
buf.appendCodePoint(c);
c = read();
}
return buf.toString();
}
public String readLine() {
String s = readLine0();
while (s.trim().length() == 0)
s = readLine0();
return s;
}
public String readLine(boolean ignoreEmptyLines) {
if (ignoreEmptyLines)
return readLine();
else
return readLine0();
}
public BigInteger readBigInteger() {
try {
return new BigInteger(readString());
} catch (NumberFormatException e) {
throw new InputMismatchException();
}
}
public char readCharacter() {
int c = read();
while (isSpaceChar(c))
c = read();
return (char) c;
}
public double readDouble() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
double res = 0;
while (!isSpaceChar(c) && c != '.') {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
}
if (c == '.') {
c = read();
double m = 1;
while (!isSpaceChar(c)) {
if (c < '0' || c > '9')
throw new InputMismatchException();
m /= 10;
res += (c - '0') * m;
c = read();
}
}
return res * sgn;
}
}
public static void main(String[] args) {
// new Thread(new Template()).start();
new TaskD().run();
}
public TaskD() {
// String id = getClass().getName().toLowerCase();
// try {
// System.setIn(new FileInputStream(id + ".in"));
// System.setOut(new PrintStream(new FileOutputStream(id + ".out")));
// } catch (FileNotFoundException e) {
// throw new RuntimeException();
// }
in = new InputReader(System.in);
out = new PrintWriter(System.out);
}
public void run() {
// int numTests = in.readInt();
// for (int testNumber = 0; testNumber < numTests; testNumber++) {
// }
n = in.readInt();
m = in.readInt();
e = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = in.readInt() - 1;
int b = in.readInt() - 1;
e[a][b] = e[b][a] = true;
}
// n = 19;
// e = new boolean[n][n];
// for (int i = 0; i < n; i++) {
// for (int j = 0; j < n; j++)
// e[i][j] = i != j;
// }
int msk = (1 << n) - 1;
qp = new long[n - 1][1 << (n - 1)];
long ans = 0;
for (int i = n - 1; i >= 0; i--) {
msk -= (1 << i);
for (int k = 0; k < i; k++)
Arrays.fill(qp[k], 0, 1 << i, -1);
for (int j = 0; j < i; j++) {
if (e[i][j]) {
e[i][j] = e[j][i] = false;
ans += go(j, msk - (1 << j), i);
e[i][j] = e[j][i] = true;
}
}
}
out.println(ans / 2);
out.close();
}
private long go(int v, int msk, int u) {
if (qp[v][msk] != -1)
return qp[v][msk];
qp[v][msk] = 0;
if (e[v][u])
qp[v][msk] = 1;
for (int i = 0; i < u; i++) {
if (e[v][i] && ((msk >> i) & 1) != 0)
qp[v][msk] += go(i, msk - (1 << i), u);
}
return qp[v][msk];
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
public class Main {
public static BufferedReader in;
public static PrintWriter out;
public static void main(String[] args) throws IOException {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
boolean showLineError = true;
if (showLineError) {
solve();
out.close();
} else {
try {
solve();
} catch (Exception e) {
} finally {
out.close();
}
}
}
static void debug(Object... os) {
out.println(Arrays.deepToString(os));
}
private static void solve() throws IOException {
String[] line = nss();
int n = Integer.parseInt(line[0]);
int m = Integer.parseInt(line[1]);
boolean[][] matrix = new boolean[n][n];
for (int i = 0; i < m; i++) {
line = nss();
int u = Integer.parseInt(line[0]) - 1;
int v = Integer.parseInt(line[1]) - 1;
matrix[u][v] = matrix[v][u] = true;
}
long[][] dp = new long[1<<n][n];
for(int i=0;i<n;i++)
dp[1<<i][i]=1;
long ret=0;
for(int mask =0;mask< 1<<n;mask++){
for(int last =0;last<n;last++)
if((mask & (1<<last))!=0){
int first=-1;
for(first=0;first<n;first++)
if((mask & (1<<first))!=0)
break;
for(int add =first;add<n;add++)
if((mask & (1<<add))==0 && matrix[last][add])
dp[mask+ (1<<add)][add]+=dp[mask][last];
if(Long.bitCount(mask)>2 && matrix[first][last])
ret+=dp[mask][last];
}
}
out.println(ret/2L);
}
private static String[] nss() throws IOException {
return in.readLine().split(" ");
}
private static int ni() throws NumberFormatException, IOException {
return Integer.parseInt(in.readLine());
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class CF11D {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int n = Integer.parseInt(st.nextToken());
int m = Integer.parseInt(st.nextToken());
boolean[][] ee = new boolean[n][n];
while (m-- > 0) {
st = new StringTokenizer(br.readLine());
int i = Integer.parseInt(st.nextToken()) - 1;
int j = Integer.parseInt(st.nextToken()) - 1;
ee[i][j] = ee[j][i] = true;
}
long cnt = 0;
// how many cycles through i with intermediate vertices before i
for (int i = 2; i < n; i++) {
long[][] dp = new long[1 << i][i];
for (int j = 0; j < i; j++)
dp[0][j] = ee[i][j] ? 1 : 0;
// dp[b][j]: how many paths from i to j with intermediate vertices in b
for (int b = 1; b < 1 << i; b++)
for (int j = 0; j < i; j++) {
if ((b & 1 << j) > 0)
continue;
for (int k = 0; k < i; k++) {
if ((b & 1 << k) == 0)
continue;
if (ee[k][j])
dp[b][j] += dp[b ^ 1 << k][k];
}
if (dp[b][j] > 0 && ee[j][i])
cnt += dp[b][j];
}
}
System.out.println(cnt / 2);
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.math.*;
public class task
{
public static void main(String args[])
{
Scanner a = new Scanner(System.in);
while(a.hasNext())
{
int n = a.nextInt();
int m = a.nextInt();
if(n == 0 && m == 0) break;
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = a.nextInt();
int y = a.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
for (int i = 0; i < n; ++i)
for (int j = i + 1; j < n; ++j)
if (adj[i][j])
--res;
for (int i = 0; i < n; ++i)
{
long[][] dp = new long[n - i][1 << (n - i)];
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask)
{
for (int j = 0; j < n - i; ++j)
{
if (dp[j][mask] != 0)
{
for (int k = 0; k < n - i; ++k)
{
if (((mask >> k) & 1) == 0 && adj[j + i][k + i])
dp[k][mask | (1 << k)] += dp[j][mask];
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[0][mask];
}
}
}
System.out.println(res/2);
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class D {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
int[][]a = new int[n][n];
for (int i = 1; i <= m; i++) {
int v1 = sc.nextInt();
int v2 = sc.nextInt();
v1--;
v2--;
a[v1][v2] = a[v2][v1] = 1;
}
long[][]dp = new long[1 << n][n];
for (int i = 0; i < n; i++) {
dp[1 << i][i] = 1;
}
for (int mask = 0; mask < (1 << n); mask++) {
if (Integer.bitCount(mask) > 1) {
for (int i = 0; i < n; i++) {
if (i==Integer.numberOfTrailingZeros(mask))
continue;
if ((mask & (1 << i)) != 0) {
for (int j = 0; j < n; j++) {
if ((mask & (1 << j)) != 0 && a[j][i]==1) {
dp[mask][i] += dp[(mask ^ (1 << i))][j];
}
}
}
}
}
}
long ans = 0;
for (int mask = 0; mask < (1 << n); mask++) {
if (Integer.bitCount(mask) >= 3) {
int t = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if (a[t][i]==1)
ans += dp[mask][i];
}
}
}
ans /= 2;
System.out.println(ans);
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.util.Arrays;
public class D11 {
static StreamTokenizer in;
static PrintWriter out;
static int nextInt() throws IOException {
in.nextToken();
return (int)in.nval;
}
static String nextString() throws IOException {
in.nextToken();
return in.sval;
}
public static void main(String[] args) throws IOException {
in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
out = new PrintWriter(System.out);
n = nextInt();
m = nextInt();
g = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = nextInt()-1, b = nextInt()-1;
g[a][b] = g[b][a] = true;
}
long ans = 0;
for (int i = n; i > 0; i--) {
//long cur = solve(i);
long cur = calc(g, i-1);
ans += cur;
}
out.println(ans/2);
out.flush();
}
static int n, m, V;
static boolean[][] g;
/*static long solve(int V) {
int v = V-1;
long[][] memo = new long[V][1 << V];
memo[v][1 << v] = 1;
for (int mask = 1; mask < (1 << V); mask++)
for (int i = 0; i < V; i++) if ((mask&(1 << i)) != 0)
for (int j = 0; j < V; j++) if (g[i][j] && (mask&(1 << j)) == 0)
memo[j][mask|(1 << j)] += memo[i][mask];
long res = 0;
for (int mask = 1; mask < (1 << V); mask++)
for (int i = 0; i < V; i++)
if (Integer.bitCount(mask) > 2 && g[v][i]) res += memo[i][mask];
return res/2;
}*/
static long calc(boolean[][] bs,int n){
long[][] dp=new long[1<<n][n];
for(int i=0;i<n;i++){
if(bs[i][n])
dp[1<<i][i] ++;
}
for(int i=1;i<1<<n;i++){
for(int j=0;j<n;j++)if(((i>>j)&1)==1)
for(int k=0;k<n;k++)if(((i>>k)&1)==0 && bs[j][k]){//add
dp[i|(1<<k)][k] += dp[i][j];
}
}
long res=0;
for(int i=0;i<1<<n;i++)for(int j=0;j<n;j++)if(Integer.bitCount(i)>=2&&bs[j][n])res+=dp[i][j];
return res;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
final long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
dp[mask][j] = 0;
}
}
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
if (dp[mask][j] != 0) {
long am = dp[mask][j];
for (int k = 0; k < n - i; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += am;
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[mask][0];
}
}
}
out.println((res - m) / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.StringTokenizer;
/**
* Created by Darren on 14-10-21.
*/
public class D {
Reader in = new Reader(System.in);
PrintWriter out = new PrintWriter(System.out);
public static void main(String[] args) throws IOException {
new D().run();
}
int n, m;
boolean[][] adjacency;
void run() throws IOException {
n = in.nextInt();
m = in.nextInt();
adjacency = new boolean[n+1][n];
for (int i = 0; i < m; i++) {
int u = in.nextInt(), v = in.nextInt();
adjacency[u-1][v-1] = adjacency[v-1][u-1] = true;
}
final int MAX_MASK = (1 << n) - 1;
long[][] dp = new long[MAX_MASK+1][n];
for (int i = 0; i < n; i++)
dp[1<<i][i] = 1;
long sum = 0;
for (int mask = 1; mask <= MAX_MASK; mask++) {
int lowestBit = first(mask);
for (int i = 0; i < n; i++) {
if (bit(i, mask) && i != lowestBit) {
for (int j = 0; j < n; j++) {
if (adjacency[j][i]) {
dp[mask][i] += dp[mask^(1<<i)][j];
}
}
if (count(mask) >= 3 && adjacency[lowestBit][i])
sum += dp[mask][i];
} else {
// dp[mask][i] = 0
}
}
}
out.println(sum / 2);
out.flush();
}
int count(int mask) {
int count = 0;
while (mask > 0) {
if ((mask & 1) == 1)
count++;
mask >>= 1;
}
return count;
}
int first(int mask) {
int index = 0;
while (mask > 0) {
if ((mask & 1) == 1)
return index;
mask >>= 1;
index++;
}
return -1;
}
boolean bit(int index, int mask) {
return ((1 << index) & mask) > 0;
}
static class Reader {
BufferedReader reader;
StringTokenizer tokenizer;
public Reader(InputStream input) {
reader = new BufferedReader(new InputStreamReader(input));
tokenizer = new StringTokenizer("");
}
/** get next word */
String nextToken() throws IOException {
while ( ! tokenizer.hasMoreTokens() ) {
//TODO add check for eof if necessary
tokenizer = new StringTokenizer( reader.readLine() );
}
return tokenizer.nextToken();
}
String readLine() throws IOException {
return reader.readLine();
}
int nextInt() throws IOException {
return Integer.parseInt( nextToken() );
}
long nextLong() throws IOException {
return Long.parseLong( nextToken() );
}
double nextDouble() throws IOException {
return Double.parseDouble( nextToken() );
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Main {
/**
* @param args
*/
static int N, M;
static long[] C;
static int[][] g;
static long[][] DP;
public static void main(String[] args) {
InputReader r = new InputReader(System.in);
N = r.nextInt();
M = r.nextInt();
g = new int[N][N];
C = new long[N + 1];
DP = new long[1 << N][N];
for(int k = 0; k < M; k++){
int i = r.nextInt() - 1;
int j = r.nextInt() - 1;
g[i][j] = g[j][i] = 1;
}
for(long[] i : DP)
Arrays.fill(i, -1);
long ret = 0;
for(int s = 0; s < N; s++){
ret += go(s, 1 << s, s);
}
System.out.println(ret / 2);
}
private static long go(int s, int m, int e) {
if(DP[m][e] != -1)return DP[m][e];
long cnt = 0;
for(int j = s; j < N; j++)if(g[e][j] == 1){
if((m & (1 << j)) != 0){
if(s == j && Integer.bitCount(m) >= 3){
cnt++;
}
}else{
cnt += go(s, m | 1 << j, j);
}
}
return DP[m][e] = cnt;
}
static class InputReader {
private BufferedReader reader;
private StringTokenizer tokenizer;
public InputReader(InputStream stream) {
reader = new BufferedReader(new InputStreamReader(stream));
tokenizer = null;
}
public String nextLine() {
try {
return reader.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}
public String next() {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
try {
tokenizer = new StringTokenizer(reader.readLine());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
public int nextInt() {
return Integer.parseInt(next());
}
public long nextLong() {
return Long.parseLong(next());
}
public double nextDouble(){
return Double.parseDouble(next());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class D implements Runnable {
public static void main(String[] args) {
new D().run();
}
class FastScanner {
BufferedReader br;
StringTokenizer st;
boolean eof;
String buf;
public FastScanner(String fileName) throws FileNotFoundException {
br = new BufferedReader(new FileReader(fileName));
nextToken();
}
public FastScanner(InputStream stream) {
br = new BufferedReader(new InputStreamReader(stream));
nextToken();
}
String nextToken() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
eof = true;
break;
}
}
String ret = buf;
buf = eof ? "-1" : st.nextToken();
return ret;
}
int nextInt() {
return Integer.parseInt(nextToken());
}
long nextLong() {
return Long.parseLong(nextToken());
}
double nextDouble() {
return Double.parseDouble(nextToken());
}
void close() {
try {
br.close();
} catch (Exception e) {
}
}
boolean isEOF() {
return eof;
}
}
FastScanner sc;
PrintWriter out;
public void run() {
Locale.setDefault(Locale.US);
try {
sc = new FastScanner(System.in);
out = new PrintWriter(System.out);
solve();
sc.close();
out.close();
} catch (Throwable e) {
e.printStackTrace();
System.exit(1);
}
}
int nextInt() {
return sc.nextInt();
}
String nextToken() {
return sc.nextToken();
}
long nextLong() {
return sc.nextLong();
}
double nextDouble() {
return sc.nextDouble();
}
void solve() {
// long time = System.currentTimeMillis();
int n = nextInt();
int m = nextInt();
boolean[][] edges = new boolean[n][n];
boolean[] edge = new boolean[(n << 5) | n];
for (int i = 0; i < m; i++) {
int x = nextInt() - 1;
int y = nextInt() - 1;
edges[x][y] = edges[y][x] = true;
edge[(x << 5) | y] = edge[(y << 5) | x] = true;
}
long[][] dp = new long[n][1 << n];
long ans = 0;
for (int i = 0; i < n; i++) {
for (int mask2 = 1; mask2 < 1 << (n - i - 1); ++mask2) {
for (int j = i + 1; j < n; j++) {
dp[j][mask2 << i << 1] = 0;
}
}
for (int j = i + 1; j < n; j++) {
if (edges[i][j]) {
dp[j][1 << j] = 1;
}
}
for (int mask2 = 1; mask2 < 1 << (n - i - 1); ++mask2) {
int mask = (mask2 << i << 1);
if ((mask & (mask - 1)) == 0) {
continue;
}
for (int j = i + 1; j < n; j++) {
if (((mask >> j) & 1) == 0) {
continue;
}
dp[j][mask] = 0;
for (int k = i + 1; k < n; k++) {
if (((mask >> k) & 1) == 0 || !edge[(j << 5) | k]) {
continue;
}
dp[j][mask] += dp[k][mask & ~(1 << j)];
}
if (edge[(i << 5) | j]) {
ans += dp[j][mask];
}
}
}
}
// if (n >= 3) {
// if (edges[n - 3][n - 2] && edges[n - 3][n - 1]
// && edges[n - 2][n - 1]) {
// ans += 2;
// }
// }
out.println(ans / 2);
// System.err.println(System.currentTimeMillis() - time);
// out.println(19 + " " + 19 * 9);
// for (int i = 0; i < 19; ++i) {
// for (int j = i + 1; j < 19; ++j) {
// out.println((i + 1) + " " + (j + 1));
// }
// }
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Inet4Address;
import java.util.Arrays;
import java.util.StringTokenizer;
/**
* Created by shirsh.bansal on 07/08/16.
*/
public class Main {
public static void main(String[] args) throws IOException {
FastScanner scanner = new FastScanner();
int n = scanner.nextInt();
int m = scanner.nextInt();
boolean graph[][] = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = scanner.nextInt();
int b = scanner.nextInt();
graph[a-1][b-1] = true;
graph[b-1][a-1] = true;
}
if(n <= 2) {
System.out.println(0);
return;
}
long dp[][] = new long[1<<n][n];
for (int i = 0; i < (1<<n); i++) {
Arrays.fill(dp[i], -1);
}
for (int i = 1; i < (1<<n); i++) {
for (int j = 0; j < n; j++) {
f(i, j, dp, graph, n);
}
}
long sum = 0;
// for (int i = 7; i < (1 << n); i++) {
// if(Integer.bitCount(i) < 3) continue;
// for (int j = 0; j < n; j++) {
// int startNode = Integer.numberOfTrailingZeros(Integer.highestOneBit(i));
// int endNode = j;
//
// if(graph[startNode][endNode] && dp[i][j] != -1) {
//// System.out.println(i + " " + startNode + " " + endNode + " " + dp[i][j]);
// sum += dp[i][j];
// }
// }
// }
for (int i = 0; i < n; i++) {
for (int j = 0; j < (1 << n); j++) {
if(Integer.bitCount(j) >= 3 && graph[Integer.numberOfTrailingZeros(j)][i]) {
sum += dp[j][i];
}
}
}
System.out.println(sum/2);
}
private static long f(int mask, int i, long[][] dp, boolean[][] graph, int n) {
if(dp[mask][i] != -1) return dp[mask][i];
if(Integer.bitCount(mask) == 1 && (mask&(1<<i)) != 0) {
dp[mask][i] = 1;
} else if(Integer.bitCount(mask) > 1 && (mask&(1<<i)) != 0 && i != Integer.numberOfTrailingZeros(mask)) {
dp[mask][i] = 0;
for (int j = 0; j < n; j++) {
if(graph[i][j]) dp[mask][i] = dp[mask][i] + f(mask^(1<<i), j, dp, graph, n);
}
} else {
dp[mask][i] = 0;
}
// int tmpMask = mask ^ (1<<i);
// for (int j = 0; j <= firstNode; j++) {
// if(((1<<j)&tmpMask) != 0 && graph[i][j]) {
// dp[mask][i] += f(tmpMask, j, dp, graph, n, firstNode);
// }
// }
//
return dp[mask][i];
}
static class FastScanner {
BufferedReader br;
StringTokenizer st;
FastScanner() {
br = new BufferedReader(new InputStreamReader(System.in));
}
String next() throws IOException {
while (st == null || !st.hasMoreTokens()) {
st = new StringTokenizer(br.readLine());
}
return st.nextToken();
}
int nextInt() throws IOException {
return Integer.parseInt(next());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws IOException {
InputStream fin = System.in;
//fin = new FileInputStream("in.txt");
Scanner cin = new Scanner(fin);
int n = cin.nextInt();
int m = cin.nextInt();
int bound = 1 << n;
boolean[][] mp = new boolean[n][n];
long[][] dp = new long[bound][n];
int used = 0;
long ret = 0;
for (int i = 0; i < n; i++) {
Arrays.fill(mp[i], false);
}
for (int i = 0; i < m; i++) {
int u = cin.nextInt() - 1;
int v = cin.nextInt() - 1;
mp[u][v] = mp[v][u] = true;
}
for (int k = 0; k < n; k++) {
for (int i = k; i < bound; i++) {
Arrays.fill(dp[i], 0);
}
dp[1 << k][k] = 1;
for (int mask = 1 << k; mask < bound; mask++) {
if ((mask & used) != 0)
continue;
for (int i = k; i < n; i++) {
if (dp[mask][i] != 0) {
if (mp[k][i] && bitcount(mask) > 2)
ret += dp[mask][i];
for (int j = k; j < n; j++) {
if ((mask & (1 << j)) == 0 && mp[i][j]) {
dp[mask ^ (1 << j)][j] += dp[mask][i];
}
}
}
}
}
used |= 1 << k;
}
System.out.println(ret / 2);
fin.close();
cin.close();
}
private static int bitcount(int mask) {
// TODO Auto-generated method stub
int ret = 0;
while (mask > 0) {
ret += mask & 1;
mask >>= 1;
}
return ret;
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class Template implements Runnable {
private void solve() throws IOException {
int n = nextInt();
int m = nextInt();
boolean[][] g = new boolean[n][n];
for (int i = 0; i < m; ++i) {
int a = nextInt() - 1;
int b = nextInt() - 1;
g[a][b] = true;
g[b][a] = true;
}
/*for (int i = 0; i < n; ++i)
for (int j = 0; j < n; ++j)
g[i][j] = true;*/
long[] am = new long[n + 1];
long[][] ways = new long[1 << n][n];
for (int start = 0; start < n; ++start) {
for (int mask = 0; mask < (1 << (n - start)); ++mask)
for (int last = start; last < n; ++last) {
ways[mask][last - start] = 0;
}
ways[1][0] = 1;
for (int mask = 0; mask < (1 << (n - start)); ++mask) {
int cnt = 0;
int tmp = mask;
while (tmp > 0) {
++cnt;
tmp = tmp & (tmp - 1);
}
for (int last = start; last < n; ++last)
if (ways[mask][last - start] > 0) {
long amm = ways[mask][last - start];
for (int i = start; i < n; ++i)
if ((mask & (1 << (i - start))) == 0 && g[last][i]) {
ways[mask | (1 << (i - start))][i - start] += amm;
}
if (g[last][start])
am[cnt] += ways[mask][last - start];
}
}
}
long res = 0;
for (int cnt = 3; cnt <= n; ++cnt) {
if (am[cnt] % (2) != 0)
throw new RuntimeException();
res += am[cnt] / (2);
}
writer.println(res);
}
public static void main(String[] args) {
new Template().run();
}
BufferedReader reader;
StringTokenizer tokenizer;
PrintWriter writer;
public void run() {
try {
reader = new BufferedReader(new InputStreamReader(System.in));
tokenizer = null;
writer = new PrintWriter(System.out);
solve();
reader.close();
writer.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
String nextToken() throws IOException {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.util.ArrayList;
import java.io.InputStream;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*
* @author Alex
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
InputReader in = new InputReader(inputStream);
OutputWriter out = new OutputWriter(outputStream);
TaskD solver = new TaskD();
solver.solve(1, in, out);
out.close();
}
static class TaskD {
int n;
ArrayList<Integer>[] adj;
long[] mem;
long cycles(int cur, int start, int visited) {
if (cur == start && visited > 0) {
return Integer.bitCount(visited) >= 3 ? 1 : 0;
}
int index = n * visited + cur;
if (mem[index] != -1) return mem[index];
long res = 0;
int newvisited = visited | (1 << cur);
for (int nxt : adj[cur]) {
if (nxt >= start && (nxt == start || ((visited >> nxt) & 1) == 0)) {
res += cycles(nxt, start, newvisited);
}
}
return mem[index] = res;
}
public void solve(int testNumber, InputReader in, OutputWriter out) {
n = in.readInt();
int m = in.readInt();
adj = new ArrayList[n];
mem = new long[n * (1 << n)];
for (int i = 0; i < adj.length; i++) adj[i] = new ArrayList<>();
for (int i = 0; i < m; i++) {
int a = in.readInt() - 1, b = in.readInt() - 1;
adj[a].add(b);
adj[b].add(a);
}
long res = 0;
for (int start = 0; start < n; start++) {
Arrays.fill(mem, -1);
res += cycles(start, start, 0) / 2;
}
out.printLine(res);
}
}
static class OutputWriter {
private final PrintWriter writer;
public OutputWriter(OutputStream outputStream) {
writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
}
public OutputWriter(Writer writer) {
this.writer = new PrintWriter(writer);
}
public void close() {
writer.close();
}
public void printLine(long i) {
writer.println(i);
}
}
static class InputReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private InputReader.SpaceCharFilter filter;
public InputReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int readInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return isWhitespace(c);
}
public static boolean isWhitespace(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class ASimpleTask
{
/************************ SOLUTION STARTS HERE ***********************/
private static void solve(FastScanner s1, PrintWriter out){
int V = s1.nextInt();
int E = s1.nextInt();
int graph[] = new int[V];
long DP[][] = new long[1 << V][V];
while(E-->0) {
int u = s1.nextInt() - 1;
int v = s1.nextInt() - 1;
graph[u] |= (1 << v);
graph[v] |= (1 << u);
}
for(int i=0;i<V;i++)
DP[1 << i][i] = 1;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
for(int fromSet = mask ^ (1 << u);fromSet > 0; fromSet ^= Integer.lowestOneBit(fromSet)) {
int v = Integer.numberOfTrailingZeros(fromSet);
// System.out.printf("mask = %s , u = %d , v = %d\n" , Integer.toBinaryString(mask) , u , v);
if((graph[u] & (1 << v)) != 0)
DP[mask][u] += DP[mask ^ (1 << u)][v];
}
}
}
long totalCycles = 0;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
if(Integer.bitCount(mask) >= 3) {
int start = Integer.numberOfTrailingZeros(mask);
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
if((graph[u] & (1 << start)) != 0)
totalCycles += DP[mask][u];
}
}
}
totalCycles /= 2;
/* for(long l[] : DP)
out.println(Arrays.toString(l));*/
out.println(totalCycles);
}
/************************ SOLUTION ENDS HERE ************************/
/************************ TEMPLATE STARTS HERE *********************/
public static void main(String []args) throws IOException {
FastScanner in = new FastScanner(System.in);
PrintWriter out =
new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), false);
solve(in, out);
in.close();
out.close();
}
static class FastScanner{
BufferedReader reader;
StringTokenizer st;
FastScanner(InputStream stream){reader=new BufferedReader(new InputStreamReader(stream));st=null;}
String next()
{while(st == null || !st.hasMoreTokens()){try{String line = reader.readLine();if(line == null){return null;}
st = new StringTokenizer(line);}catch (Exception e){throw new RuntimeException();}}return st.nextToken();}
String nextLine() {String s=null;try{s=reader.readLine();}catch(IOException e){e.printStackTrace();}return s;}
int nextInt() {return Integer.parseInt(next());}
long nextLong() {return Long.parseLong(next());}
double nextDouble(){return Double.parseDouble(next());}
char nextChar() {return next().charAt(0);}
int[] nextIntArray(int n) {int[] a= new int[n]; int i=0;while(i<n){a[i++]=nextInt();} return a;}
long[] nextLongArray(int n) {long[]a= new long[n]; int i=0;while(i<n){a[i++]=nextLong();} return a;}
int[] nextIntArrayOneBased(int n) {int[] a= new int[n+1]; int i=1;while(i<=n){a[i++]=nextInt();} return a;}
long[] nextLongArrayOneBased(int n){long[]a= new long[n+1];int i=1;while(i<=n){a[i++]=nextLong();}return a;}
void close(){try{reader.close();}catch(IOException e){e.printStackTrace();}}
}
/************************ TEMPLATE ENDS HERE ************************/
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class ASimpleTask
{
/************************ SOLUTION STARTS HERE ***********************/
static long memo[][];
static int graph[];
static long hamiltonianPath(int mask , int u) {
if(memo[mask][u] != -1)
return memo[mask][u];
else if(u == Integer.numberOfTrailingZeros(mask))
return 0;
else {
long sum = 0;
for(int fromSet = mask ^ (1 << u);fromSet > 0; fromSet ^= Integer.lowestOneBit(fromSet)) {
int v = Integer.numberOfTrailingZeros(fromSet);
// System.out.printf("mask = %s , u = %d , v = %d\n" , Integer.toBinaryString(mask) , u , v);
if((graph[u] & (1 << v)) != 0)
sum += hamiltonianPath(mask ^ (1 << u), v);
}
return memo[mask][u] = sum;
}
}
private static void solveBottomUp(FastScanner s1, PrintWriter out){
int V = s1.nextInt();
int E = s1.nextInt();
graph = new int[V];
long DP[][] = new long[1 << V][V];
while(E-->0) {
int u = s1.nextInt() - 1;
int v = s1.nextInt() - 1;
graph[u] |= (1 << v);
graph[v] |= (1 << u);
}
for(int i=0;i<V;i++)
DP[1 << i][i] = 1;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
for(int fromSet = mask ^ (1 << u);fromSet > 0; fromSet ^= Integer.lowestOneBit(fromSet)) {
int v = Integer.numberOfTrailingZeros(fromSet);
// System.out.printf("mask = %s , u = %d , v = %d\n" , Integer.toBinaryString(mask) , u , v);
if((graph[u] & (1 << v)) != 0)
DP[mask][u] += DP[mask ^ (1 << u)][v];
}
}
}
long totalCycles = 0;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
if(Integer.bitCount(mask) >= 3) {
int start = Integer.numberOfTrailingZeros(mask);
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
if((graph[u] & (1 << start)) != 0)
totalCycles += DP[mask][u];
}
}
}
totalCycles /= 2;
/* for(long l[] : DP)
out.println(Arrays.toString(l));*/
out.println(totalCycles);
}
private static void solveTopDown(FastScanner s1, PrintWriter out){
int V = s1.nextInt();
int E = s1.nextInt();
graph = new int[V];
memo = new long[1 << V][V];
for(long l[] : memo)
Arrays.fill(l, -1);
while(E-->0) {
int u = s1.nextInt() - 1;
int v = s1.nextInt() - 1;
graph[u] |= (1 << v);
graph[v] |= (1 << u);
}
for(int i=0;i<V;i++)
memo[1 << i][i] = 1;
long totalCycles = 0;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
if(Integer.bitCount(mask) >= 3) {
int start = Integer.numberOfTrailingZeros(mask);
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
if((graph[u] & (1 << start)) != 0)
totalCycles += hamiltonianPath(mask, u);
}
}
}
totalCycles /= 2;
out.println(totalCycles);
}
/************************ SOLUTION ENDS HERE ************************/
/************************ TEMPLATE STARTS HERE *********************/
public static void main(String []args) throws IOException {
FastScanner in = new FastScanner(System.in);
PrintWriter out =
new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), false);
solveTopDown(in, out);
in.close();
out.close();
}
static class FastScanner{
BufferedReader reader;
StringTokenizer st;
FastScanner(InputStream stream){reader=new BufferedReader(new InputStreamReader(stream));st=null;}
String next()
{while(st == null || !st.hasMoreTokens()){try{String line = reader.readLine();if(line == null){return null;}
st = new StringTokenizer(line);}catch (Exception e){throw new RuntimeException();}}return st.nextToken();}
String nextLine() {String s=null;try{s=reader.readLine();}catch(IOException e){e.printStackTrace();}return s;}
int nextInt() {return Integer.parseInt(next());}
long nextLong() {return Long.parseLong(next());}
double nextDouble(){return Double.parseDouble(next());}
char nextChar() {return next().charAt(0);}
int[] nextIntArray(int n) {int[] a= new int[n]; int i=0;while(i<n){a[i++]=nextInt();} return a;}
long[] nextLongArray(int n) {long[]a= new long[n]; int i=0;while(i<n){a[i++]=nextLong();} return a;}
int[] nextIntArrayOneBased(int n) {int[] a= new int[n+1]; int i=1;while(i<=n){a[i++]=nextInt();} return a;}
long[] nextLongArrayOneBased(int n){long[]a= new long[n+1];int i=1;while(i<=n){a[i++]=nextLong();}return a;}
void close(){try{reader.close();}catch(IOException e){e.printStackTrace();}}
}
/************************ TEMPLATE ENDS HERE ************************/
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.PrintWriter;
import java.util.Scanner;
public class D {
public void run(Scanner in, PrintWriter out) {
int n = in.nextInt();
int[][] graph = new int[n][n];
int m = in.nextInt();
for (int i = 0; i < m; i++) {
int x = in.nextInt() - 1;
int y = in.nextInt() - 1;
graph[x][y] = 1;
graph[y][x] = 1;
}
long[][] dyn = new long[1 << n][n];
for (int i = 0; i < n; i++) {
dyn[1 << i][i] = 1;
}
long answer = 0;
for (int mask = 1; mask < 1 << n; mask++) {
int start = Integer.numberOfTrailingZeros(mask);
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) == 0) continue;
for (int j = start + 1; j < n; j++) {
if (graph[i][j] > 0 && (mask & (1 << j)) == 0) {
dyn[mask + (1 << j)][j] += dyn[mask][i];
}
}
if (graph[i][start] > 0) {
answer += dyn[mask][i];
}
}
}
out.println((answer - m)/ 2);
}
public static void main(String[] args) {
try (Scanner in = new Scanner(System.in);
PrintWriter out = new PrintWriter(System.out)
) {
new D().run(in, out);
} catch (Exception e) {
e.printStackTrace();
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
for (int i = 0; i < n; ++i) {
for (int j = i + 1; j < n; ++j) {
if (adj[i][j]) {
--res;
}
}
}
long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
dp[mask][j] = 0;
}
}
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
if (dp[mask][j] != 0) {
for (int k = 0; k < n - i; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += dp[mask][j];
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[mask][0];
}
}
}
out.println(res / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
final long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
int Limit = 1 << (n - i);
int nn = n - i;
for (int mask = 0; mask < Limit; ++mask) {
for (int j = 0; j < nn; ++j) {
dp[mask][j] = 0;
}
}
dp[0][0] = 1;
for (int mask = 0; mask < Limit; ++mask) {
if ((mask & 1) == 0) {
for (int j = 0; j < nn; ++j) {
if (dp[mask][j] != 0) {
long am = dp[mask][j];
for (int k = 0; k < nn; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += am;
}
}
}
}
} else {
res += dp[mask][0];
}
}
}
out.println((res - m) / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.StringTokenizer;
/**
* Codeforces 11D - A Simple Task
* Created by Darren on 14-10-21.
* O(2^n * n^2) time and O(2^n * n) space.
*
* Tag: dynamic programming, bitmask, graph
*/
public class D {
Reader in = new Reader(System.in);
PrintWriter out = new PrintWriter(System.out);
public static void main(String[] args) throws IOException {
new D().run();
}
int n, m;
boolean[][] adjacency; // Adjacency matrix
void run() throws IOException {
n = in.nextInt();
m = in.nextInt();
adjacency = new boolean[n+1][n];
for (int i = 0; i < m; i++) {
int u = in.nextInt(), v = in.nextInt();
adjacency[u-1][v-1] = adjacency[v-1][u-1] = true; // Converted to 0-based
}
final int MASK_BOUND = (1 << n);
// dp[i][j]: the number of Hamiltonian walks over the subgraph formed by
// the mask i, starting at the smallest vertex and ending at vertex j
// dp[1<<i][i] = 1;
// dp[i][j] = sum_k{dp[i^j][k]} if j is within the mask i and (k,j) is an edge
long[][] dp = new long[MASK_BOUND][n];
for (int i = 0; i < n; i++)
dp[1<<i][i] = 1;
long sum = 0;
for (int mask = 1; mask < MASK_BOUND; mask++) {
int lowestVertex = (int) (Math.log(lowest(mask)) / Math.log(2));
for (int i = 0; i < n; i++) {
if (bit(i, mask) && i != lowestVertex) {
for (int j = 0; j < n; j++) {
if (adjacency[j][i]) {
dp[mask][i] += dp[mask^(1<<i)][j];
}
}
// A simple cycle with length not smaller than 3
if (count(mask) >= 3 && adjacency[lowestVertex][i])
sum += dp[mask][i];
} else {
// dp[mask][i] = 0
}
}
}
out.println(sum / 2); // A cycle is counted twice
out.flush();
}
// Return the number of '1's in the binary representation of the mask
int count(int mask) {
int count = 0;
while (mask > 0) {
if ((mask & 1) == 1)
count++;
mask >>= 1;
}
return count;
}
// Return an integer with only one '1' in its binary form and the position of the
// only '1' is the same with the lowest '1' in mask
int lowest(int mask) {
// mask = x1b where b is a sequence of zeros;
// -mask = x'1b', where x' and b' is formed by reversing digits in x and b;
// mask & (-mask) = 0...010...0, where the only 1 is the lowest 1 in mask
return mask & (-mask);
}
// Check whether the digit at the given index of the mask is '1'
boolean bit(int index, int mask) {
return ((1 << index) & mask) > 0;
}
static class Reader {
BufferedReader reader;
StringTokenizer tokenizer;
public Reader(InputStream input) {
reader = new BufferedReader(new InputStreamReader(input));
tokenizer = new StringTokenizer("");
}
/** get next word */
String nextToken() throws IOException {
while ( ! tokenizer.hasMoreTokens() ) {
//TODO add check for eof if necessary
tokenizer = new StringTokenizer( reader.readLine() );
}
return tokenizer.nextToken();
}
String readLine() throws IOException {
return reader.readLine();
}
int nextInt() throws IOException {
return Integer.parseInt( nextToken() );
}
long nextLong() throws IOException {
return Long.parseLong( nextToken() );
}
double nextDouble() throws IOException {
return Double.parseDouble( nextToken() );
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.io.BufferedWriter;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*
* @author Alex
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
InputReader in = new InputReader(inputStream);
OutputWriter out = new OutputWriter(outputStream);
TaskD solver = new TaskD();
solver.solve(1, in, out);
out.close();
}
static class TaskD {
int n;
boolean[][] adj;
long[] mem;
int start;
long cycles(int cur, int visited) {
if (cur == start && visited > 0) {
return Integer.bitCount(visited) >= 3 ? 1 : 0;
}
int index = visited * n + cur;
if (mem[index] != -1) return mem[index];
long res = 0;
int newvisited = visited | (1 << cur);
for (int nxt = 0; nxt < n; nxt++)
if (adj[cur][nxt]) {
if (nxt >= start && (nxt == start || ((visited >> nxt) & 1) == 0)) {
res += cycles(nxt, newvisited);
}
}
return mem[index] = res;
}
public void solve(int testNumber, InputReader in, OutputWriter out) {
n = in.readInt();
int m = in.readInt();
mem = new long[n * (1 << n)];
adj = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = in.readInt() - 1, b = in.readInt() - 1;
adj[a][b] = true;
adj[b][a] = true;
}
long res = 0;
for (int start = 0; start < n; start++) {
Arrays.fill(mem, -1);
this.start = start;
res += cycles(start, 0) / 2;
}
out.printLine(res);
}
}
static class OutputWriter {
private final PrintWriter writer;
public OutputWriter(OutputStream outputStream) {
writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
}
public OutputWriter(Writer writer) {
this.writer = new PrintWriter(writer);
}
public void close() {
writer.close();
}
public void printLine(long i) {
writer.println(i);
}
}
static class InputReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
private InputReader.SpaceCharFilter filter;
public InputReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public int readInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return isWhitespace(c);
}
public static boolean isWhitespace(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class D11 {
static boolean[][] g;
static int n, m;
public static void main(String[] args) throws IOException {
input.init(System.in);
PrintWriter out = new PrintWriter(System.out);
n = input.nextInt();
m = input.nextInt();
g = new boolean[n][n];
for(int i = 0; i<m; i++)
{
int a = input.nextInt()-1, b = input.nextInt()-1;
g[a][b] = g[b][a] = true;
}
long res = 0;
map = new HashMap<Integer, Long>();
for(int i = n-1; i>=0; i--)
{
memo = new long[i+1][1<<(i+1)];
for(long[] A : memo) Arrays.fill(A, -1);
res += count(i, i, 1<<i)/2;
}
out.println(res);
out.close();
}
static long[][] memo;
static HashMap<Integer, Long> map;
static long count(int at, int start, int mask)
{
if(memo[at][mask] != -1) return memo[at][mask];
int bits = Integer.bitCount(mask);
if(at == start && bits > 2) return 1;
long res = 0;
for(int i = 0; i<=start; i++)
{
if(!g[at][i]) continue;
if(i != start && (mask & (1<<i)) > 0) continue;
if(i == start && bits <= 2) continue;
res += count(i, start, mask | (1<<i));
}
return memo[at][mask] = res;
}
public static class input {
static BufferedReader reader;
static StringTokenizer tokenizer;
static void init(InputStream input) {
reader = new BufferedReader(new InputStreamReader(input));
tokenizer = new StringTokenizer("");
}
static String next() throws IOException {
while (!tokenizer.hasMoreTokens())
tokenizer = new StringTokenizer(reader.readLine());
return tokenizer.nextToken();
}
static int nextInt() throws IOException {
return Integer.parseInt(next());
}
static double nextDouble() throws IOException {
return Double.parseDouble(next());
}
static long nextLong() throws IOException {
return Long.parseLong(next());
}
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while ( sc.hasNextInt() ) {
int n = sc.nextInt();
long m = sc.nextInt();
boolean edge[][] = new boolean[n][n];
long dp[][] = new long[1<<n][n];
for ( long i = 1 ; i<=m ; ++i ) {
int u = sc.nextInt();
int v = sc.nextInt();
-- u;
-- v;
edge[u][v] = edge[v][u] = true;
}
for ( int i = 0 ; i<n ; ++i ) {
dp[1<<i][i] = 1;
}
long res = 0;
for ( int i = 1 ; i<(1<<n) ; ++i ) {
int first = cal(i);
for ( int j = first ; j<n ; ++j ) {
if ( dp[i][j]==0 ) {
continue;
}
for ( int k = first ; k<n ; ++k ) {
if ( j==k || !edge[j][k] ) {
continue;
}
if ( k==first && judge(i) ) {
res += dp[i][j];
}
if ( (i&(1<<k))==0 ) {
dp[i|(1<<k)][k] += dp[i][j];
}
}
}
}
System.out.println(res/2);
}
}
public static int cal( int x ) {
int ord = 0;
while ( true ) {
if ( (x&(1<<ord))!=0 ) {
break;
}
++ ord;
}
return ord;
}
public static boolean judge( int x ) {
int cnt = 0;
while ( x>=1 ) {
if ( (x&1)==1 ) {
++ cnt;
}
x >>= 1;
}
return cnt >= 3;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
public class Hello {
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
int n = scan.nextInt();
int m = scan.nextInt();
boolean[][] graph = new boolean[n][n];
for(int i = 0; i < m; i++) {
int from = scan.nextInt() - 1;
int to = scan.nextInt() - 1;
graph[from][to] = graph[to][from] = true;
}
int max = 1 << n;
long[][] dp = new long[max][n];
for(int mask = 1; mask < max; mask++) {
for(int i = 0; i < n; i++) {
boolean existI = (mask & (1 << i)) > 0;
if(Integer.bitCount(mask) == 1 && existI) {
dp[mask][i] = 1;
} else if(Integer.bitCount(mask) > 1 && existI && first(mask) != i) {
long sum = 0;
for(int j = 0; j < n; j++) {
if(graph[i][j]) sum += dp[mask ^ (1 << i)][j];
}
dp[mask][i] = sum;
}
}
}
long countCycles = 0;
for(int mask = 7; mask < max; mask++) {
for(int i = 0; i < n; i++) {
if(Integer.bitCount(mask) >= 3 && graph[first(mask)][i]) {
countCycles += dp[mask][i];
}
}
}
System.out.println(countCycles / 2);
}
public static int first(int mask) {
int i = 0;
while((mask & (1 << i++)) == 0);
return i - 1;
}
} | np | 11_D. A Simple Task | CODEFORCES |
/**
* Codeforces Beta Round #10
*
* @author ProjectYoung
*/
import java.util.Scanner;
public class CF11D {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
boolean[][] map = new boolean[n][n];
long[][] dp = new long[1 << n][n];
for (int i = 0; i < m; i++) {
int a = sc.nextInt() - 1;
int b = sc.nextInt() - 1;
map[a][b] = map[b][a] = true;
dp[(1 << a) + (1 << b)][Math.max(a, b)] = 1;
}
long ans = 0;
for (int mask = 1; mask < (1 << n); mask++) {
int lowbit = 0;
for (; (mask & (1 << lowbit)) == 0; lowbit++);
for (int i = lowbit + 1; i < n; i++) {
if ((mask & (1 << i)) == 0) {
continue;
}
for (int j = lowbit + 1; j < n; j++) {
if ((mask & (1 << j)) == 0 || j == i) {
continue;
}
if (map[i][j]) {
dp[mask][i] += dp[mask ^ (1 << i)][j];
}
}
if (map[lowbit][i]) {
ans += dp[mask][i];
}
}
}
System.out.println((ans - m) / 2);
sc.close();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
public class D11 {
static StreamTokenizer in;
static PrintWriter out;
static int nextInt() throws IOException {
in.nextToken();
return (int)in.nval;
}
static String nextString() throws IOException {
in.nextToken();
return in.sval;
}
public static void main(String[] args) throws IOException {
in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
out = new PrintWriter(System.out);
n = nextInt();
m = nextInt();
g = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = nextInt()-1, b = nextInt()-1;
g[a][b] = g[b][a] = true;
}
long ans = 0;
for (int i = n-1; i >= 0; i--) {
long cur = solve(i);
ans += cur;
}
out.println(ans/2);
out.flush();
}
static int n, m;
static boolean[][] g;
static long solve(int v) {
long[][] memo = new long[v][1 << v];
for (int i = 0; i < v; i++)
if (g[v][i])
memo[i][1 << i] = 1;
for (int mask = 1; mask < (1 << v); mask++)
for (int i = 0; i < v; i++) if ((mask&(1 << i)) != 0)
for (int j = 0; j < v; j++) if (g[i][j] && (mask&(1 << j)) == 0)
memo[j][mask|(1 << j)] += memo[i][mask];
long res = 0;
for (int mask = 1; mask < (1 << v); mask++)
for (int i = 0; i < v; i++)
if (Integer.bitCount(mask) > 1 && g[v][i]) res += memo[i][mask];
return res;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
for (int i = 0; i < n; ++i) {
for (int j = i + 1; j < n; ++j) {
if (adj[i][j]) {
--res;
}
}
}
for (int i = 0; i < n; ++i) {
long[][] dp = new long[n - i][1 << (n - i)];
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
if (dp[j][mask] != 0) {
for (int k = 0; k < n - i; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[k][mask | (1 << k)] += dp[j][mask];
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[0][mask];
}
}
}
out.println(res / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.math.BigInteger;
import java.util.*;
public class Template implements Runnable {
BufferedReader in;
PrintWriter out;
StringTokenizer tok = new StringTokenizer("");
void init() throws FileNotFoundException {
try {
in = new BufferedReader(new FileReader("input.txt"));
out = new PrintWriter("output.txt");
} catch (Exception e) {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
}
}
class GraphBuilder {
int n, m;
int[] x, y;
int index;
int[] size;
GraphBuilder(int n, int m) {
this.n = n;
this.m = m;
x = new int[m];
y = new int[m];
size = new int[n];
}
void add(int u, int v) {
x[index] = u;
y[index] = v;
size[u]++;
size[v]++;
index++;
}
int[][] build() {
int[][] graph = new int[n][];
for (int i = 0; i < n; i++) {
graph[i] = new int[size[i]];
}
for (int i = index - 1; i >= 0; i--) {
int u = x[i];
int v = y[i];
graph[u][--size[u]] = v;
graph[v][--size[v]] = u;
}
return graph;
}
}
String readString() throws IOException {
while (!tok.hasMoreTokens()) {
try {
tok = new StringTokenizer(in.readLine());
} catch (Exception e) {
return null;
}
}
return tok.nextToken();
}
int readInt() throws IOException {
return Integer.parseInt(readString());
}
int[] readIntArray(int size) throws IOException {
int[] res = new int[size];
for (int i = 0; i < size; i++) {
res[i] = readInt();
}
return res;
}
long[] readLongArray(int size) throws IOException {
long[] res = new long[size];
for (int i = 0; i < size; i++) {
res[i] = readLong();
}
return res;
}
long readLong() throws IOException {
return Long.parseLong(readString());
}
double readDouble() throws IOException {
return Double.parseDouble(readString());
}
<T> List<T>[] createGraphList(int size) {
List<T>[] list = new List[size];
for (int i = 0; i < size; i++) {
list[i] = new ArrayList<>();
}
return list;
}
public static void main(String[] args) {
new Template().run();
// new Thread(null, new Template(), "", 1l * 200 * 1024 * 1024).start();
}
long timeBegin, timeEnd;
void time() {
timeEnd = System.currentTimeMillis();
System.err.println("Time = " + (timeEnd - timeBegin));
}
long memoryTotal, memoryFree;
void memory() {
memoryFree = Runtime.getRuntime().freeMemory();
System.err.println("Memory = " + ((memoryTotal - memoryFree) >> 10)
+ " KB");
}
public void run() {
try {
timeBegin = System.currentTimeMillis();
memoryTotal = Runtime.getRuntime().freeMemory();
init();
solve();
out.close();
if (System.getProperty("ONLINE_JUDGE") == null) {
time();
memory();
}
} catch (Exception e) {
e.printStackTrace();
System.exit(-1);
}
}
void solve() throws IOException {
int n = readInt();
int m = readInt();
int max = 1 << n;
long[][] dp = new long[n][max];
for (int i = 0; i < n; i++) {
dp[i][1 << i] = 1;
}
GraphBuilder gb = new GraphBuilder(n, m);
for (int i = 0; i < m; i++) {
gb.add(readInt() - 1, readInt() - 1);
}
int[][] graph = gb.build();
for (int mask = 1; mask < max; mask++) {
int firstBit = -1;
for (int i = 0; i < n; i++) {
if (hasBit(mask, i)) {
firstBit = i;
break;
}
}
for (int last = 0; last < n; last++) {
if (dp[last][mask] == 0) continue;
for (int y : graph[last]) {
if (!hasBit(mask, y) && y > firstBit) {
dp[y][mask | (1 << y)] += dp[last][mask];
}
}
}
}
long answer = 0;
for (int i = 1; i < max; i++) {
if (Integer.bitCount(i) < 3) continue;
int firstBit = -1;
for (int j = 0; j < n; j++) {
if (hasBit(i, j)) {
firstBit = j;
break;
}
}
for (int y : graph[firstBit]) {
answer += dp[y][i];
}
}
out.println(answer / 2);
}
boolean hasBit(int mask, int bit) {
return (mask & (1 << bit)) != 0;
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.StringTokenizer;
public class Main {
private FastScanner in;
private PrintWriter out;
public void solve() throws IOException {
int N = in.nextInt();
int M = in.nextInt();
int[][] edges = new int[N][N];
for (int i = 0; i < M; i++) {
int a = in.nextInt() - 1;
int b = in.nextInt() - 1;
edges[a][b] = 1;
edges[b][a] = 1;
}
int globalCountMasks = 1 << N;
int[][] masks = new int[N + 1][];
int[] countMasks = new int[N + 1];
for (int i = 0; i <= N; i++) {
masks[i] = new int[combinations(N, i)];
}
for (int i = 0; i < globalCountMasks; i++) {
int c = countBit1(i);
masks[c][countMasks[c]] = i;
countMasks[c]++;
}
long globalCountCycles = 0;
long[][] count = new long[globalCountMasks][N];
for (int a = 0; a < N - 2; a++) {
int aBit = 1 << a;
count[aBit][a] = 1;
long countCycles = 0;
for (int i = 2; i <= N; i++) {
for (int m = 0; m < countMasks[i]; m++) {
int mask = masks[i][m];
if ((mask & aBit) == 0)
continue;
if ((mask & (aBit - 1)) > 0)
continue;
count[mask][a] = 0;
for (int v = a + 1; v < N; v++) {
int vBit = 1 << v;
if ((mask & vBit) == 0)
continue;
count[mask][v] = 0;
for (int t = a; t < N; t++) {
if ((mask & (1 << t)) == 0 || t == v
|| edges[v][t] == 0)
continue;
count[mask][v] += count[mask ^ vBit][t];
}
if (edges[a][v] == 1 && mask != (aBit | vBit)) {
countCycles += count[mask][v];
}
}
}
}
globalCountCycles += countCycles / 2;
}
out.println(globalCountCycles);
}
private int countBit1(int k) {
int c = 0;
while (k > 0) {
c += k & 1;
k >>= 1;
}
return c;
}
private int combinations(int n, int k) {
if (k > n || k < 0) {
throw new IllegalArgumentException();
}
int r = 1;
for (int i = 1; i <= k; i++) {
r = r * (n + 1 - i) / i;
}
return r;
}
public void run() {
try {
in = new FastScanner(System.in);
out = new PrintWriter(System.out);
solve();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
class FastScanner {
BufferedReader br;
StringTokenizer st;
FastScanner(InputStream is) {
br = new BufferedReader(new InputStreamReader(is));
}
String next() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
}
public static void main(String[] arg) {
new Main().run();
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class Template implements Runnable {
private void solve() throws IOException {
int n = nextInt();
int m = nextInt();
boolean[][] g = new boolean[n][n];
for (int i = 0; i < m; ++i) {
int a = nextInt() - 1;
int b = nextInt() - 1;
g[a][b] = true;
g[b][a] = true;
}
/*for (int i = 0; i < n; ++i)
for (int j = 0; j < n; ++j)
g[i][j] = true;*/
long[] am = new long[n + 1];
long[][] ways = new long[1 << (n - 1)][n];
for (int start = 0; start < n; ++start) {
for (int mask = 0; mask < (1 << (n - start - 1)); ++mask)
for (int last = start; last < n; ++last) {
ways[mask][last - start] = 0;
}
ways[1 >> 1][0] = 1;
for (int mask = 1; mask < (1 << (n - start)); mask += 2) {
int cnt = 0;
int tmp = mask;
while (tmp > 0) {
++cnt;
tmp = tmp & (tmp - 1);
}
for (int last = start; last < n; ++last)
if (ways[mask >> 1][last - start] > 0) {
long amm = ways[mask >> 1][last - start];
for (int i = start; i < n; ++i)
if ((mask & (1 << (i - start))) == 0 && g[last][i]) {
ways[(mask | (1 << (i - start))) >> 1][i - start] += amm;
}
if (g[last][start])
am[cnt] += ways[mask >> 1][last - start];
}
}
}
long res = 0;
for (int cnt = 3; cnt <= n; ++cnt) {
if (am[cnt] % (2) != 0)
throw new RuntimeException();
res += am[cnt] / (2);
}
writer.println(res);
}
public static void main(String[] args) {
new Template().run();
}
BufferedReader reader;
StringTokenizer tokenizer;
PrintWriter writer;
public void run() {
try {
reader = new BufferedReader(new InputStreamReader(System.in));
tokenizer = null;
writer = new PrintWriter(System.out);
solve();
reader.close();
writer.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
String nextToken() throws IOException {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
/**
* 4 6
* 1 2
* 1 3
* 1 4
* 2 3
* 2 4
* 3 4
*
*
*
*
*
*
* @author pttrung
*/
public class D {
public static long [][]dp;
public static boolean [][]map;
public static void main(String[] args) {
Scanner in = new Scanner();
PrintWriter out = new PrintWriter(System.out);
// int N = 19;
// System.out.println(N + " " + ((N - 1) * N / 2));
// for (int i = 1; i
// <= N; i++) {
// for (int j = i + 1; j <= N; j++) {
// System.out.println(i + " " + j);
// }
// }
int n = in.nextInt();
int m = in.nextInt();
dp = new long[n][1 << n + 1] ;
map = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = in.nextInt() - 1;
int b = in.nextInt() - 1;
map[a][b] = true;
map[b][a] = true;
}
for(long []temp : dp){
Arrays.fill(temp, -1);
}
long result = 0;
for(int i = 0; i < n; i++){
result += cal((1<<i),i,i,1);
}
out.println((result/2));
out.close();
}
public static long cal(int mask, int from, int to, int len){
if(dp[to][mask]!= -1){
return dp[to][mask];
}
long result = 0;
if(len > 2 && map[from][to]){
result++;
}
for(int i = from+1; i< map.length; i++){
if(map[to][i] && (mask & (1<<i)) == 0){
result += cal(mask|(1<<i), from,i,len + 1);
}
}
dp[to][mask] = result;
return result;
}
public static class FT {
int[] data;
FT(int n) {
data = new int[n];
}
public void update(int index, int value) {
while (index < data.length) {
data[index] += value;
index += (index & (-index));
}
}
public int get(int index) {
int result = 0;
while (index > 0) {
result += data[index];
index -= (index & (-index));
}
return result;
}
}
public static long gcd(long a, long b) {
if (b == 0) {
return a;
}
return gcd(b, a % b);
}
public static long pow(long a, long b) {
if (b == 0) {
return 1;
}
if (b == 1) {
return a;
}
long val = pow(a, b / 2);
if (b % 2 == 0) {
return val * val ;
} else {
return val * (val * a) ;
}
}
static class Scanner {
BufferedReader br;
StringTokenizer st;
public Scanner() {
// System.setOut(new PrintStream(new BufferedOutputStream(System.out), true));
br = new BufferedReader(new InputStreamReader(System.in));
}
public String next() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (Exception e) {
throw new RuntimeException();
}
}
return st.nextToken();
}
public long nextLong() {
return Long.parseLong(next());
}
public int nextInt() {
return Integer.parseInt(next());
}
public double nextDouble() {
return Double.parseDouble(next());
}
public String nextLine() {
st = null;
try {
return br.readLine();
} catch (Exception e) {
throw new RuntimeException();
}
}
public boolean endLine() {
try {
String next = br.readLine();
while (next != null && next.trim().isEmpty()) {
next = br.readLine();
}
if (next == null) {
return true;
}
st = new StringTokenizer(next);
return st.hasMoreTokens();
} catch (Exception e) {
throw new RuntimeException();
}
}
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Main implements Runnable {
private int n;
private int nn;
private long[][] dp;
private boolean[][] gr;
// ////////////////////////////////////////////////////////////////////
// Solution
private void solve() throws Throwable {
n = nextInt();
nn = 1 << n;
gr = new boolean[n][n];
dp = new long[n][nn];
for (int i = 0; i < n; i++) {
Arrays.fill(dp[i], -1);
}
int m = nextInt();
for (int i = 0; i < m; i++) {
int a = nextInt() - 1, b = nextInt() - 1;
gr[a][b] = gr[b][a] = true;
}
for (int i = 0; i < n; i++) {
dp[i][0] = 0;
}
for (int mask = 1; mask < nn; mask++) {
int bCount = Integer.bitCount(mask);
if (bCount < 2) {
dp[Integer.numberOfTrailingZeros(mask)][mask] = 0;
} else if (bCount == 2) {
int msk = mask;
int one = Integer.numberOfTrailingZeros(msk);
msk ^= (1 << one);
int two = Integer.numberOfTrailingZeros(msk);
dp[two][mask] = gr[one][two] ? 1 : 0;
}
}
long count = 0;
for (int mask = 1; mask < nn; mask++) {
if (Integer.bitCount(mask) < 3) continue;
int i = Integer.numberOfTrailingZeros(mask);
for (int j = i + 1; j < n; j++) {
int jj = 1 << j;
if (gr[i][j] && ((jj & mask) != 0)) {
count += Dp(j, mask);
}
}
}
pw.println(count / 2);
}
private long Dp(int j, int mask) {
if (dp[j][mask] != -1) return dp[j][mask];
int i = Integer.numberOfTrailingZeros(mask);
assert i < j;
int m = mask ^ (1 << j);
long ans = 0;
for (int p = i + 1; p < n; p++) {
if (!gr[p][j]) continue;
if ((mask & (1 << p)) == 0) continue;
ans += Dp(p, m);
}
dp[j][mask] = ans;
return ans;
}
// ////////////////////////////////////////////////////////////////////
// Utility functions
PrintWriter pw;
BufferedReader in;
StringTokenizer st;
void initStreams() throws FileNotFoundException {
//System.setIn(new FileInputStream("2"));
in = new BufferedReader(new InputStreamReader(System.in));
pw = new PrintWriter(System.out);
}
String nextString() throws IOException {
while (st == null || !st.hasMoreTokens()) {
st = new StringTokenizer(in.readLine());
}
return st.nextToken();
}
int nextInt() throws NumberFormatException, IOException {
return Integer.parseInt(nextString());
}
long nextLong() throws NumberFormatException, IOException {
return Long.parseLong(nextString());
}
double nextDouble() throws NumberFormatException, IOException {
return Double.parseDouble(nextString());
}
static Throwable sError;
public static void main(String[] args) throws Throwable {
Thread t = new Thread(new Main());
t.start();
t.join();
if (sError != null) {
throw sError;
}
}
public void run() {
try {
initStreams();
solve();
} catch (Throwable e) {
sError = e;
} finally {
if (pw != null)
pw.close();
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
public class Main {
private int n;
private int m;
private boolean[][] g;
private long[][] dp;
private int[] count;
private int[] first;
private void solve() throws IOException {
n = nextInt();
m = nextInt();
g = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = nextInt() - 1;
int b = nextInt() - 1;
g[a][b] = true;
g[b][a] = true;
}
count = new int[1 << n];
first = new int[1 << n];
dp = new long[1 << n][n];
for (int mask = 0; mask < (1 << n); mask++) {
count[mask] = bitCount(mask);
for (int i = 0; i < n; i++) {
if (bit(i, mask) == 1) {
first[mask] = i;
break;
}
}
}
for (int mask = 0; mask < (1 << n); mask++) {
for (int i = 0; i < n; i++) {
if ((count[mask] == 1) && (bit(i, mask) == 1)) {
dp[mask][i] = 1;
} else {
for (int j = 0; j < n; j++) {
if (g[j][i] && (count[mask] > 1) && (bit(i, mask) == 1)
&& (first[mask] != i)) {
dp[mask][i] += dp[mask ^ (1 << i)][j];
}
}
}
}
}
long ans = 0;
for (int i = 0; i < n; i++) {
for (int mask = 0; mask < (1 << n); mask++) {
if ((count[mask] >= 3) && (first[mask] != i)
&& (g[i][first[mask]])) {
ans += dp[mask][i];
}
}
}
if (ans % 2 != 0) {
throw new RuntimeException("SHIT!!!");
}
out.println(ans / 2);
}
private final int bit(int i, int mask) {
return (mask & (1 << i)) != 0 ? 1 : 0;
}
private final int bitCount(int mask) {
int ret = 0;
while (mask != 0) {
ret++;
mask -= mask & (-mask);
}
return ret;
}
private BufferedReader in;
private PrintWriter out;
private StringTokenizer st;
private Main() throws IOException {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
eat("");
solve();
in.close();
out.close();
}
private void eat(String s) {
st = new StringTokenizer(s);
}
String next() throws IOException {
while (!st.hasMoreTokens()) {
String line = in.readLine();
if (line == null) {
return null;
}
eat(line);
}
return st.nextToken();
}
int nextInt() throws IOException {
return Integer.parseInt(next());
}
public static void main(String[] args) throws IOException {
new Main();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int V = in.nextInt();
int E = in.nextInt();
boolean [][] G = new boolean [V][V];
for (int i = 0; i < E; i++) {
int u = in.nextInt()-1;
int v = in.nextInt()-1;
G[u][v] = true;
G[v][u] = true;
}
int pset = 1 << V;
long [][] dp = new long [pset][V];
long cycles = 0;
for (int set = 1; set < pset; set++) {
int bit = Integer.bitCount(set);
int src = first(set);
if (bit == 1) {
dp[set][src] = 1;
}
else if(bit > 1) {
for (int i = 0; i < V; i++) {
if(i == src) continue;
// Check if i is in set
if ((set & (1 << i)) != 0) {
int S_1 = set ^ (1 << i);
for (int v = 0; v < V; v++) {
if (G[v][i] == true) {
dp[set][i] += dp[S_1][v];
}
}
}
//Count Cycles:
if (bit >= 3 && G[src][i]) {
cycles += dp[set][i];
}
}
}
}
System.out.println(cycles/2);
}
public static int first(int n) {
int cnt = 0;
while ((n & 1) != 1) {
cnt++;
n >>= 1;
}
return cnt;
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
for (int i = 0; i < n; ++i) {
for (int j = i + 1; j < n; ++j) {
if (adj[i][j]) {
--res;
}
}
}
final long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
dp[mask][j] = 0;
}
}
dp[0][0] = 1;
for (int mask = 0; mask < (1 << (n - i)); ++mask) {
for (int j = 0; j < n - i; ++j) {
if (dp[mask][j] != 0) {
for (int k = 0; k < n - i; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += dp[mask][j];
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[mask][0];
}
}
}
out.println(res / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
import static java.lang.Math.*;
import static java.util.Arrays.fill;
import static java.util.Arrays.binarySearch;
import static java.util.Arrays.sort;
public class Main {
public static void main(String[] args) throws IOException {
// try {
// if (new File("input.txt").exists())
// System.setIn(new FileInputStream("input.txt"));
// } catch (SecurityException e) {}
// long time1 = System.currentTimeMillis();
new Main().run();
// checkMemory();
// long time2 = System.currentTimeMillis();
// System.err.println((time2 - time1) + " ms");
}
BufferedReader in;
PrintWriter out;
StringTokenizer st = new StringTokenizer("");
int vNum;
int eNum;
boolean[][] g;
void run() throws IOException {
in = new BufferedReader(new InputStreamReader(System.in));
out = new PrintWriter(System.out);
vNum = nextInt();
eNum = nextInt();
g = new boolean [vNum][vNum];
for (int e = 0; e < eNum; e++) {
int u = nextInt() - 1;
int v = nextInt() - 1;
g[u][v] = g[v][u] = true;
}
// for (int v = 7; v <= 11; v++) {
// genFullGraph(v);
// if (naiveDP() != optimizedDP())
// System.err.println("Error on " + v);
// }
out.println(optimizedDP());
out.close();
}
/***************************************************************
* Test
**************************************************************/
long naiveDP() {
long[] count = new long [vNum + 1];
int size = 1 << vNum;
long[][] dp = new long [size][vNum];
for (int begin = 0; begin < vNum; begin++) {
for (long[] row : dp) fill(row, 0L);
dp[1 << begin][begin] = 1L;
for (int mask = 0; mask < size; mask++) {
int len = Integer.bitCount(mask);
for (int v = 0; v < vNum; v++) {
long cval = dp[mask][v];
if (cval == 0L) continue;
if (g[v][begin]) count[len] += cval;
for (int nv = 0; nv < vNum; nv++) {
if (g[v][nv]) {
int nmask = mask | (1 << nv);
if (nmask != mask)
dp[nmask][nv] += cval;
}
}
}
}
}
long ret = 0L;
for (int len = 3; len <= vNum; len++) {
if (count[len] % (len * 2) != 0) System.err.println("ERROR!");
ret += count[len] / len / 2;
}
return ret;
}
long optimizedDP() {
long[] count = new long [vNum + 1];
long[][] dp = new long [1 << vNum][vNum];
for (int last = vNum - 1; last >= 0; last--) {
int size = 1 << last;
for (int mask = 0; mask < size; mask++)
fill(dp[mask], 0, last, 0L);
for (int nv = 0; nv < last; nv++)
if (g[last][nv]) dp[1 << nv][nv] = 1L;
for (int mask = 0; mask < size; mask++) {
int len = Integer.bitCount(mask) + 1;
for (int v = 0; v < last; v++) {
long cval = dp[mask][v];
if (cval == 0L) continue;
if (g[v][last]) count[len] += cval;
for (int nv = 0; nv < last; nv++) {
if (g[v][nv]) {
int nmask = mask | (1 << nv);
if (nmask != mask)
dp[nmask][nv] += cval;
}
}
}
}
}
long ret = 0L;
for (int len = 3; len <= vNum; len++) {
if (count[len] % 2 != 0) System.err.println("ERROR!");
ret += count[len] >> 1;
}
return ret;
}
void genFullGraph(int vNum) {
this.vNum = vNum;
this.eNum = vNum * (vNum - 1) / 2;
g = new boolean [vNum][vNum];
for (int i = 0; i < vNum; i++)
for (int j = i + 1; j < vNum; j++)
g[i][j] = g[j][i] = true;
}
/***************************************************************
* Utility
**************************************************************/
static long b2mb(long b) {
return b >> 20;
}
static void checkMemory() {
System.err.println(b2mb(Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) + "/" + b2mb(Runtime.getRuntime().totalMemory()) + " MB");
}
/***************************************************************
* Input
**************************************************************/
String nextToken() throws IOException {
while (!st.hasMoreTokens())
st = new StringTokenizer(in.readLine());
return st.nextToken();
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
String nextLine() throws IOException {
st = new StringTokenizer("");
return in.readLine();
}
boolean EOF() throws IOException {
while (!st.hasMoreTokens()) {
String s = in.readLine();
if (s == null)
return true;
st = new StringTokenizer(s);
}
return false;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.IOException;
import java.io.InputStream;
public class Cycles
{
public static FastInputStream fis;
public static void main(String[] args) throws IOException
{
fis = new FastInputStream(System.in);
System.out.println(solve(fis.nextInt(), fis.nextInt()));
fis.close();
}
public static long solve(int n, int m) throws IOException
{
boolean[][] graph = new boolean[n][];
long[][] state = new long[1 << n][n];
for (int i = 0; i < n; i++)
graph[i] = new boolean[n - i];
for (int i = 0; i < m; i++)
{
int a = fis.nextInt() - 1;
int b = fis.nextInt() - 1;
setConnected(graph, a, b);
state[(1 << a) | (1 << b)][a > b ? a : b] = 1;
}
long res = 0;
for (int i = 2; i < n; i++)
{
int baseCombination = (2 << i) - 1;
while (baseCombination < (1 << n))
{
int min = getFirstOne(baseCombination);
int bits = baseCombination;
while (bits != 0)
{
int firstBit = bits & (-bits);
int firstBitPos = getFirstOne(firstBit);
bits &= bits - 1;
if (firstBitPos == min)
continue;
int leftOverBits = baseCombination - firstBit;
int nextBits = leftOverBits;
while (nextBits != 0)
{
int nextBit = nextBits & (-nextBits);
int nextBitPos = getFirstOne(nextBit);
nextBits &= nextBits - 1;
if (nextBitPos == min)
continue;
if (!isConnected(graph, firstBitPos, nextBitPos))
continue;
/*System.out.println("Comb: " + Integer.toBinaryString(baseCombination));
System.out.println("Bit: " + Integer.toBinaryString(firstBit));
System.out.println("(pos): " + firstBitPos);
System.out.println("Left over: " + Integer.toBinaryString(leftOverBits));
System.out.println("Next bit: " + Integer.toBinaryString(nextBit));
System.out.println("(pos): " + nextBitPos);
System.out.println();*/
state[baseCombination][firstBitPos] += state[leftOverBits][nextBitPos];
}
if (isConnected(graph, firstBitPos, min))
res += state[baseCombination][firstBitPos];
}
baseCombination = nextCombination(baseCombination);
}
}
/*for (int i = 0; i < state.length; i++)
{
if ((i & (i - 1)) == 0)
continue;
System.out.print(String.format("%4s:", Integer.toBinaryString(i)).replace(' ', '0') + " ");
for (int j = 0; j < state[i].length; j++)
System.out.print(state[i][j] + " ");
System.out.println();
}*/
return res >> 1;
}
public static boolean isConnected(boolean[][] graph, int a, int b)
{
if (b < a || graph[a].length <= (b - a))
return graph[b][a - b];
return graph[a][b - a];
}
public static void setConnected(boolean[][] graph, int a, int b)
{
if (b < a || graph[a].length <= (b - a))
graph[b][a - b] = true;
else
graph[a][b - a] = true;
}
public static int nextCombination(int x)
{
int smallest = x & -x;
int ripple = x + smallest;
int ones = ((x ^ ripple) >> 2) / smallest;
return ripple | ones;
}
public static boolean on(int bitmask, int pos)
{
return ((bitmask >> pos) & 1) == 1;
}
public static int setOn(int bitmask, int pos)
{
return bitmask | (1 << pos);
}
public static int setOff(int bitmask, int pos)
{
return bitmask & ~(1 << pos);
}
public static int getOns(int bitmask)
{
int amt = 0;
while (bitmask != 0)
{
bitmask &= bitmask - 1;
amt++;
}
return amt;
}
public static int getFirstOne(int bitmask)
{
if (bitmask == 0)
return -1;
int first = 0;
while ((bitmask & 1) != 1)
{
first++;
bitmask = bitmask >> 1;
}
return first;
}
public static class FastInputStream extends InputStream
{
private InputStream in;
private byte[] buffer = new byte[512];
private int loaded = 0;
private int pointer = 0;
public FastInputStream(InputStream in)
{
this.in = in;
}
@Override
public int read() throws IOException
{
if (hasNext())
return buffer[pointer++];
else
return -1;
}
public void skipWhitespace() throws IOException
{
while (hasNext())
{
char c = (char) buffer[pointer];
if (c == ' ' || c == '\t' || c == '\n' || c == '\r') pointer++;
else return;
}
}
public Integer nextInt() throws IOException
{
skipWhitespace();
if (!hasNext()) return null;
byte multiplier = 1;
int number = 0;
if (buffer[pointer] == '-')
{
multiplier = -1;
pointer++;
}
while (hasNext())
{
char c = (char) buffer[pointer];
if (c >= '0' && c <= '9')
{
number = (number << 3) + (number << 1) + c - '0';
pointer++;
} else break;
}
return number * multiplier;
}
public void close() throws IOException
{
in.close();
}
public boolean hasNext() throws IOException
{
while (pointer == loaded)
{
loaded = in.read(buffer);
pointer = 0;
if (loaded == -1) return false;
}
return loaded != -1;
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Ok_Simple {
static BufferedReader reader;
static StringTokenizer tokenizer;
static boolean am[][];
static long dp[][];
static int n;
public static void main(String[] args) throws IOException {
reader = new BufferedReader(new InputStreamReader(System.in));
int m;
n = NextInt();
m = NextInt();
am = new boolean[n][n];
dp = new long[n][1 << n];
for (int i = 0; i < n; ++i)
Arrays.fill(dp[i], -1);
for (int i = 0; i < m; ++i) {
int a = NextInt() - 1;
int b = NextInt() - 1;
am[a][b] = am[b][a] = true;
};
long res = 0;
for (int a = 0; a < n; ++a)
res += solve(a, (1 << a));
System.out.println(res / 2);
}
private static long solve(int b, int mask) {
int a = 0;
for (int i = 0 ;i < n; ++i)
if (((mask >> i) & 1) != 0)
{
a = i;
break;
}
if (dp[b][mask] >= 0)
return dp[b][mask];
long res = 0;
if (am[b][a] && Integer.bitCount(mask) > 2)
res = 1;
for (int i = a + 1; i < n; ++i)
if (((mask >> i) & 1) == 0 && am[b][i])
res += solve(i, mask ^ (1 << i));
return dp[b][mask] = res;
}
static int NextInt() throws NumberFormatException, IOException {
return Integer.parseInt(NextToken());
}
static double NextDouble() throws NumberFormatException, IOException {
return Double.parseDouble(NextToken());
}
static long NextLong() throws NumberFormatException, IOException {
return Long.parseLong(NextToken());
}
static String NextToken() throws IOException {
while(tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class Main {
public static void main(String[] args) throws java.lang.Exception {
BufferedReader kek = new BufferedReader(new InputStreamReader(System.in));
//Scanner skek = new Scanner(System.in);
PrintWriter outkek = new PrintWriter(System.out);
String[] input = kek.readLine().split(" ");
int N = Integer.parseInt(input[0]), M = Integer.parseInt(input[1]);
boolean[][] connected = new boolean[N + 1][N];
long[][] walks = new long[1 << N][N];
long res = 0;
for(int i = 0; i < M; i++){
input = kek.readLine().split(" ");
int A = Integer.parseInt(input[0]) - 1, B = Integer.parseInt(input[1]) - 1;
connected[A][B] = connected[B][A] = true;
}
for(int i = 0; i < N; i++){
walks[1 << i][i] = 1;
}
for(int i = 1; i < 1 << N; i++){
int temp = (int) (Math.log(i & -(i)) / 0.6931471805599453);
for(int j = 0; j < N; j++){
if(((1 << j) & i) > 0 && j != temp){
for(int k = 0; k < N; k++){
if(connected[k][j]){
walks[i][j] += walks[i ^ (1 << j)][k];
}
}
int count = 0, track = i;
while(track > 0){
if(track % 2 == 1){
count++;
}
track /= 2;
}
if(count >= 3 && connected[temp][j]){
res += walks[i][j];
}
}
}
}
outkek.println(res / 2);
kek.close();
outkek.close();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;
public class ASimpleTask {
static StreamTokenizer st;
static int nextInt() {
try {
st.nextToken();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return (int) st.nval;
}
static int[][] edges;
static long[][] dp;
public static void main(String[] args) {
st = new StreamTokenizer(new BufferedReader(new InputStreamReader(
System.in)));
int n = nextInt();
int m = nextInt();
edges = new int[n][n];
for (int i = 0; i < m; i++) {
int from = nextInt() - 1;
int to = nextInt() - 1;
edges[from][to] = edges[to][from] = 1;
}
dp = new long[(1 << n) + 1][n + 1];
for (int mask = 1; mask < (1 << n); mask++) {
for (int i = 0; i < n; i++) {
if (Integer.bitCount(mask) == 1 && (mask & (1 << i)) != 0) {
dp[mask][i] = 1;
continue;
}
if (Integer.bitCount(mask) > 1 && (mask & (1 << i)) != 0
&& first(mask, n) != i) {
for (int j = 0; j < n; j++) {
if (edges[i][j] == 1) {
dp[mask][i] += dp[mask ^ (1 << i)][j];
}
}
}
}
}
long count = 0;
for (int mask = 1; mask < (1 << n); mask++) {
for (int i = 0; i < n; i++) {
if (Integer.bitCount(mask) >= 3
&& edges[i][first(mask, n)] != 0)
count += dp[mask][i];
}
}
System.out.println(count / 2);
}
static int first(int mask, int n) {
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) != 0)
return i;
}
return -1;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Main implements Runnable {
private int n;
private int nn;
private boolean[][] gr;
private long[][] D;
// ////////////////////////////////////////////////////////////////////
// Solution
private void solve() throws Throwable {
n = nextInt();
nn = 1 << n;
gr = new boolean[n][n];
int m = nextInt();
for (int i = 0; i < m; i++) {
int a = nextInt() - 1, b = nextInt() - 1;
gr[a][b] = gr[b][a] = true;
}
D = new long[n][nn];
for (int i = 0; i < n; i++) {
Arrays.fill(D[i], -1);
}
long count = 0;
for (int i = 0; i < n; i++) {
count += getD(i, i, 1, 1 << i);
}
pw.println(count / 2);
}
private long getD(int first, int last, int cnt, int mask) {
if (D[last][mask] != -1) return D[last][mask];
long ans = 0;
if (cnt >= 3 && gr[first][last])
ans++;
for (int i = first + 1; i < n; i++) {
if (gr[last][i] && (mask & (1 << i)) == 0) {
ans += getD(first, i, cnt + 1, mask | (1 << i));
}
}
D[last][mask] = ans;
return ans;
}
// ////////////////////////////////////////////////////////////////////
// Utility functions
PrintWriter pw;
BufferedReader in;
StringTokenizer st;
void initStreams() throws FileNotFoundException {
//System.setIn(new FileInputStream("2"));
in = new BufferedReader(new InputStreamReader(System.in));
pw = new PrintWriter(System.out);
}
String nextString() throws IOException {
while (st == null || !st.hasMoreTokens()) {
st = new StringTokenizer(in.readLine());
}
return st.nextToken();
}
int nextInt() throws NumberFormatException, IOException {
return Integer.parseInt(nextString());
}
long nextLong() throws NumberFormatException, IOException {
return Long.parseLong(nextString());
}
double nextDouble() throws NumberFormatException, IOException {
return Double.parseDouble(nextString());
}
static Throwable sError;
public static void main(String[] args) throws Throwable {
Thread t = new Thread(new Main());
t.start();
t.join();
if (sError != null) {
throw sError;
}
}
public void run() {
try {
initStreams();
solve();
} catch (Throwable e) {
sError = e;
} finally {
if (pw != null)
pw.close();
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class ASimpleTask
{
/************************ SOLUTION STARTS HERE ***********************/
static long memo[][];
static int graph[];
static long hamiltonianPath(int mask , int u) {
if(memo[mask][u] != -1)
return memo[mask][u];
else if(u == Integer.numberOfTrailingZeros(mask)) // according to our convention A simple path is not allowed to end at the lowest vertex
return 0;
else {
long sum = 0;
for(int fromSet = mask ^ (1 << u);fromSet > 0; fromSet ^= Integer.lowestOneBit(fromSet)) {
int v = Integer.numberOfTrailingZeros(fromSet);
// System.out.printf("mask = %s , u = %d , v = %d\n" , Integer.toBinaryString(mask) , u , v);
if((graph[u] & (1 << v)) != 0)
sum += hamiltonianPath(mask ^ (1 << u), v);
}
return /*memo[mask][u] = */sum;
}
}
private static void solveBottomUp(FastScanner s1, PrintWriter out){
int V = s1.nextInt();
int E = s1.nextInt();
graph = new int[V];
long DP[][] = new long[1 << V][V];
while(E-->0) {
int u = s1.nextInt() - 1;
int v = s1.nextInt() - 1;
graph[u] |= (1 << v);
graph[v] |= (1 << u);
}
for(int i=0;i<V;i++)
DP[1 << i][i] = 1;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
for(int fromSet = mask ^ (1 << u);fromSet > 0; fromSet ^= Integer.lowestOneBit(fromSet)) {
int v = Integer.numberOfTrailingZeros(fromSet);
// System.out.printf("mask = %s , u = %d , v = %d\n" , Integer.toBinaryString(mask) , u , v);
if((graph[u] & (1 << v)) != 0)
DP[mask][u] += DP[mask ^ (1 << u)][v];
}
}
}
long totalCycles = 0;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
if(Integer.bitCount(mask) >= 3) {
int start = Integer.numberOfTrailingZeros(mask);
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
if((graph[u] & (1 << start)) != 0)
totalCycles += DP[mask][u];
}
}
}
totalCycles /= 2;
/* for(long l[] : DP)
out.println(Arrays.toString(l));*/
out.println(totalCycles);
}
private static void solveTopDown(FastScanner s1, PrintWriter out){
int V = s1.nextInt();
int E = s1.nextInt();
graph = new int[V];
memo = new long[1 << V][V];
for(long l[] : memo)
Arrays.fill(l, -1);
while(E-->0) {
int u = s1.nextInt() - 1;
int v = s1.nextInt() - 1;
graph[u] |= (1 << v);
graph[v] |= (1 << u);
}
for(int i=0;i<V;i++)
memo[1 << i][i] = 1;
long totalCycles = 0;
for(int mask = 1 , end = 1 << V;mask < end;mask++) {
if(Integer.bitCount(mask) >= 3) {
int start = Integer.numberOfTrailingZeros(mask);
for(int set = mask;Integer.bitCount(set) > 1;set ^= Integer.highestOneBit(set)) {
int u = Integer.numberOfTrailingZeros(Integer.highestOneBit(set));
if((graph[u] & (1 << start)) != 0)
totalCycles += hamiltonianPath(mask, u);
}
}
}
totalCycles /= 2;
out.println(totalCycles);
}
/************************ SOLUTION ENDS HERE ************************/
/************************ TEMPLATE STARTS HERE *********************/
public static void main(String []args) throws IOException {
FastScanner in = new FastScanner(System.in);
PrintWriter out =
new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)), false);
solveBottomUp(in, out);
in.close();
out.close();
}
static class FastScanner{
BufferedReader reader;
StringTokenizer st;
FastScanner(InputStream stream){reader=new BufferedReader(new InputStreamReader(stream));st=null;}
String next()
{while(st == null || !st.hasMoreTokens()){try{String line = reader.readLine();if(line == null){return null;}
st = new StringTokenizer(line);}catch (Exception e){throw new RuntimeException();}}return st.nextToken();}
String nextLine() {String s=null;try{s=reader.readLine();}catch(IOException e){e.printStackTrace();}return s;}
int nextInt() {return Integer.parseInt(next());}
long nextLong() {return Long.parseLong(next());}
double nextDouble(){return Double.parseDouble(next());}
char nextChar() {return next().charAt(0);}
int[] nextIntArray(int n) {int[] a= new int[n]; int i=0;while(i<n){a[i++]=nextInt();} return a;}
long[] nextLongArray(int n) {long[]a= new long[n]; int i=0;while(i<n){a[i++]=nextLong();} return a;}
int[] nextIntArrayOneBased(int n) {int[] a= new int[n+1]; int i=1;while(i<=n){a[i++]=nextInt();} return a;}
long[] nextLongArrayOneBased(int n){long[]a= new long[n+1];int i=1;while(i<=n){a[i++]=nextLong();}return a;}
void close(){try{reader.close();}catch(IOException e){e.printStackTrace();}}
}
/************************ TEMPLATE ENDS HERE ************************/
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
import java.io.*;
public class Main implements Runnable {
private void solution() throws IOException {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] adj = new boolean[n][n];
long res = 0;
for (int i = 0; i < m; ++i) {
int x = in.nextInt();
int y = in.nextInt();
adj[x - 1][y - 1] = true;
adj[y - 1][x - 1] = true;
}
final long[][] dp = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
int Limit = 1 << (n - i);
int nn = n - i;
for (int mask = 0; mask < Limit; ++mask) {
for (int j = 0; j < nn; ++j) {
dp[mask][j] = 0;
}
}
dp[0][0] = 1;
for (int mask = 0; mask < Limit; ++mask) {
for (int j = 0; j < nn; ++j) {
if (dp[mask][j] != 0) {
long am = dp[mask][j];
for (int k = 0; k < nn; ++k) {
if (((mask >> k) & 1) == 0 && adj[j + i][k + i]) {
dp[mask | (1 << k)][k] += am;
}
}
}
}
if (((mask >> 0) & 1) != 0) {
res += dp[mask][0];
}
}
}
out.println((res - m) / 2);
}
public void run() {
try {
solution();
in.reader.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
private class Scanner {
BufferedReader reader;
StringTokenizer tokenizer;
public Scanner(Reader reader) {
this.reader = new BufferedReader(reader);
this.tokenizer = new StringTokenizer("");
}
public boolean hasNext() throws IOException {
while (!tokenizer.hasMoreTokens()) {
String next = reader.readLine();
if (next == null) {
return false;
}
tokenizer = new StringTokenizer(next);
}
return true;
}
public String next() throws IOException {
hasNext();
return tokenizer.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public String nextLine() throws IOException {
tokenizer = new StringTokenizer("");
return reader.readLine();
}
public double nextDouble() throws IOException {
return Double.parseDouble(next());
}
}
public static void main(String[] args) throws IOException {
new Thread(null, new Main(), "", 1 << 28).start();
}
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
Scanner in = new Scanner(new InputStreamReader(System.in));
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.InputMismatchException;
import java.io.*;
import java.util.HashMap;
/**
* Generated by Contest helper plug-in
* Actual solution is at the bottom
*/
public class Main {
public static void main(String[] args) {
InputReader in = new StreamInputReader(System.in);
PrintWriter out = new PrintWriter(System.out);
run(in, out);
}
public static void run(InputReader in, PrintWriter out) {
Solver solver = new SimpleCycles();
solver.solve(1, in, out);
Exit.exit(in, out);
}
}
class StreamInputReader extends InputReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar, numChars;
public StreamInputReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
@Override
public void close() {
try {
stream.close();
} catch (IOException ignored) {
}
}
}
abstract class InputReader {
private boolean finished = false;
public abstract int read();
public int nextInt() {
return Integer.parseInt(nextToken());
}
public String nextToken() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuffer res = new StringBuffer();
do {
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
private boolean isSpaceChar(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
public void setFinished(boolean finished) {
this.finished = finished;
}
public abstract void close();
}
interface Solver {
public void solve(int testNumber, InputReader in, PrintWriter out);
}
class Exit {
private Exit() {
}
public static void exit(InputReader in, PrintWriter out) {
in.setFinished(true);
in.close();
out.close();
}
}
class SimpleCycles implements Solver {
public void solve(int testNumber, InputReader in, PrintWriter out) {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] g = new boolean[n][n];
for (int i = 0; i < m; ++i) {
int u = in.nextInt();
int v = in.nextInt();
--u;
--v;
g[u][v] = g[v][u] = true;
}
HashMap<Integer, Integer> pointer = new HashMap<Integer, Integer> () ;
for (int i =0 ; i < n; ++i) {
pointer.put(1 << i, i);
}
long[][] dm = new long[1 << n][n];
for (int i = 0; i < n; ++i) {
dm[1 << i][i] = 1;
}
for (int i = 0; i < (1 << n); ++i) {
for (int j = 0; j < n; ++j) {
if (dm[i][j] == 0) continue;
int k = pointer.get(i - (i & (i - 1)));
for (int u = k + 1; u < n; ++u) {
if (g[j][u] && (i & (1 << u)) == 0) {
dm[i | (1 << u)][u] += dm[i][j];
}
}
}
}
long res = 0;
for (int i = 0; i < (1 << n); ++i) {
for (int j = 0; j < n; ++j)
if (Integer.bitCount(i) >= 3) {
int c = pointer.get(i - (i & (i - 1)));
if (g[c][j]) res += (long) dm[i][j];
}
}
out.print(res / 2);
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
public class SimpleTask {
public static void main(String[] args) throws Exception {
InputReader in = new InputReader(System.in);
int n = in.nextInt();
int m = in.nextInt();
int[] g = new int[n];
long[][] dp = new long[1 << n][n];
for (int i = 0; i < m; i++) {
int a = in.nextInt() - 1, b = in.nextInt() - 1;
g[a] |= (1 << b);
g[b] |= (1 << a);
}
int all = (1 << n) - 1;
for (int i = 0; i < n; i++) {
int l = (1 << i);
int left = all ^ (l - 1) ^ l;
for (int j = left; j > 0; j = (j - 1) & left)
if ((j & (j - 1)) != 0) {
dp[j | l][i] = 1;
}
}
for (int i = (1 << n) - 1; i > 0; i--) {
int last = i & -i;
for (int j = 0; j < n; j++) {
if (((1 << j) == last && (i & (i - 1)) != 0)
|| ((1 << j) & i) == 0)
continue;
for (int k = 0; k < n; k++) {
if ((1 << k) >= last && ((1 << k) & g[j]) != 0
&& ((1 << k) == last || ((1 << k) & i) == 0)) {
dp[i][j] += dp[i | (1 << k)][k];
}
}
}
}
long res = 0;
for (int i = 0; i < n; i++)
res += dp[(1 << i)][i];
System.out.println(res / 2);
}
static class InputReader {
private BufferedReader reader;
private StringTokenizer tokenizer;
public InputReader(InputStream stream) {
reader = new BufferedReader(new InputStreamReader(stream));
tokenizer = null;
}
public String next() {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
try {
tokenizer = new StringTokenizer(reader.readLine());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return tokenizer.nextToken();
}
public int nextInt() {
return Integer.parseInt(next());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
public class A{
static int n,m,start;
static boolean [][] adj;
static long [][] mem;
public static void main(String[] args)throws Throwable {
Scanner sc=new Scanner(System.in);
n=sc.nextInt();
m=sc.nextInt();
adj=new boolean [n][n];
for(int i=0;i<m;i++){
int u=sc.nextInt()-1;
int v=sc.nextInt()-1;
adj[u][v]=true;
adj[v][u]=true;
}
mem=new long [n+1][(1<<n)];
for(int i=0;i<=n;i++)
Arrays.fill(mem[i], -1);
long ans=0;
for(int i=0;i<n;i++){
start=i;
ans+=dp(i, (1<<i));
}
System.out.println(ans/2);
}
public static long dp(int i,int msk){
if(mem[i][msk]!=-1)
return mem[i][msk];
long ans=0;
if(adj[i][start] && Integer.bitCount(msk)>2)
ans++;
for(int j=start+1;j<n;j++){
if(adj[i][j] && (msk & (1<<j))==0){
ans+=dp(j, msk | (1<<j));
}
}
return mem[i][msk]=ans;
}
static class Scanner {
StringTokenizer st;
BufferedReader br;
public Scanner(InputStream s){ br = new BufferedReader(new InputStreamReader(s));}
public String next() throws IOException {
while (st == null || !st.hasMoreTokens()) st = new StringTokenizer(br.readLine());
return st.nextToken();}
public int nextInt() throws IOException {return Integer.parseInt(next());}
public long nextLong() throws IOException {return Long.parseLong(next());}
public String nextLine() throws IOException {return br.readLine();}
public double nextDouble() throws IOException { return Double.parseDouble(next()); }
public boolean ready() throws IOException {return br.ready();}
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
/**
* Created by huhansan on 2017/12/19.
* http://codeforces.com/problemset/problem/11/D
* 参考 Petr http://codeforces.com/contest/11/submission/47646
* 求所有不同的环的个数
* 首先按长度分 C = C1+C2+...+Cn
* 长度为i的环的数量的求解， 规定一个顺序，以最小值开头，按开头不同分治，再按不同结尾分治
* 遍历所有排列，如果长度为i的排列成环，则对应的Ci值+1
* 遍历方式的选择：
* 1.integer实现bitmask，从1加到1<<n
* 2.递归
*/
public class CF_11D {
long[][] ways; //ways[mask][endPointIndex]
boolean[][] connect;
int n, m, lowestIndex, mask; //n 节点数， m边数 00000...0 <--> n:n-1:n-2.....1 bitmask
private static int HEAD_POINT_INDEX = 0;
public void solve() throws Exception {
int a, b;
long total = 0;
n = nextInt();
m = nextInt();
connect = new boolean[n][n];
ways = new long[1 << n][n];
for (int i = 0; i < m; i++) {
a = nextInt();
b = nextInt();
connect[a - 1][b - 1] = true;
connect[b - 1][a - 1] = true;
}
for (int i = 0; i < n; i++) {
ways[1 << i][i] = 1; //初始化，单定点也视为环
}
for (mask = 1; mask < 1 << n; mask++) {
int tmp = mask, cnt = 0;
while (tmp > 0) {
tmp = tmp & (tmp - 1);
cnt++;
}
lowestIndex = -1;
for (int endPointIndex = 0; endPointIndex < n; endPointIndex++) {
if ((mask & 1 << endPointIndex) != 0) {
if (lowestIndex < 0) {
lowestIndex = endPointIndex;
} else if (lowestIndex != endPointIndex) {
for (int i = lowestIndex; i < n; i++)
if (connect[i][endPointIndex]) {
ways[mask][endPointIndex] += ways[mask & ~(1 << endPointIndex)][i]; // P[(1,2,3)4]的数量 == 其它+P[1,2,3]的数量， 也就是1,2,3三个点可以组成的以1开头的排列数
}
if (connect[endPointIndex][lowestIndex] && cnt > 2) { //以首尾定点分治，存在对称性，如 1-2-3-4-1 == 1-4-3-2-1
total += ways[mask][endPointIndex];
}
}
}
}
}
writer.println(total / 2);
}
public static void main(String[] args) {
new CF_11D().run();
}
BufferedReader reader;
StringTokenizer tokenizer;
PrintWriter writer;
public void run() {
try {
reader = new BufferedReader(new InputStreamReader(System.in));
tokenizer = null;
writer = new PrintWriter(System.out);
solve();
reader.close();
writer.close();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
String nextToken() throws IOException {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.awt.List;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;
import java.util.StringTokenizer;
public class T {
static Scanner in = new Scanner();
static PrintWriter out = new PrintWriter(System.out);
static boolean adj[][];
static int n, m, from;
static long memo[][];
static long Num_Cycle;
public static void main(String[] args) throws IOException {
n = in.nextInt();
m = in.nextInt();
adj = new boolean[n][n];
memo = new long[n][1 << n];
for (int i = 0; i < m; i++) {
int u = in.nextInt() - 1;
int v = in.nextInt() - 1;
adj[u][v] = adj[v][u] = true;
}
for (long arr[] : memo) {
Arrays.fill(arr, -1);
}
Num_Cycle = 0L;
for (int i = 0; i < n; i++) {
from = i;
Num_Cycle += dp(from, (1 << i));
}
out.println(Num_Cycle / 2);
out.flush();
out.close();
}
static long dp(int start, int mask) {
if (memo[start][mask] != -1) {
return (memo[start][mask]);
}
long ans = 0L;
if (adj[start][from] && Integer.bitCount(mask) >= 3) {// Cycle has
// atleast 3
// node and 3
// edges
ans++;
}
for (int i = from + 1; i < n; i++) {
if (adj[start][i] && ((mask & (1 << i)) == 0)) {
ans += dp(i, mask | (1 << i));
}
}
return memo[start][mask] = ans;
}
static class Scanner {
BufferedReader br;
StringTokenizer st;
Scanner() {
br = new BufferedReader(new InputStreamReader(System.in));
}
Scanner(String file) throws FileNotFoundException {
br = new BufferedReader(new FileReader(file));
}
String next() throws IOException {
while (st == null || !st.hasMoreTokens())
st = new StringTokenizer(br.readLine());
return st.nextToken();
}
int nextInt() throws NumberFormatException, IOException {
return Integer.parseInt(next());
}
String nextLine() throws IOException {
return br.readLine();
}
long nextLong() throws NumberFormatException, IOException {
return Long.parseLong(next());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.util.Arrays;
import java.util.Scanner;
public class C {
static boolean[][] matrix;
static long[][] dp;
static int n;
static int m;
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
n = s.nextInt();
m = s.nextInt();
matrix = new boolean[n][n];
for (int i=0; i<m; ++i) {
int v1 = s.nextInt()-1;
int v2 = s.nextInt()-1;
matrix[v1][v2] = true;
matrix[v2][v1] = true;
}
dp = new long[n][1<<n+1];
for (int i=0; i<n; ++i) Arrays.fill(dp[i], -1);
long res = 0;
for (int i=0; i<n; ++i)
res += calc(i, i, (1<<i), 1);
System.out.println(res/2);
}
public static long calc(int h, int c, int m, int len) {
if (dp[c][m] != -1)
return dp[c][m];
long ret = 0;
if (len > 2 && matrix[c][h])
ret = 1;
for (int i=h+1; i<n; ++i)
if ((m & (1<<i)) == 0 && matrix[c][i])
ret += calc(h, i, m | (1<<i), len + 1);
return dp[c][m] = ret;
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.IOException;
import java.io.PrintStream;
import java.util.*;
public class Template {
public static void main(String[] args) throws IOException {
final Scanner in = new Scanner(System.in);
final PrintStream out = System.out;
int n = in.nextInt(), m = in.nextInt();
boolean[][] g = new boolean[n][n];
for (int i = 0; i < m; ++i) {
int a = in.nextInt(), b = in.nextInt();
--a; --b;
g[a][b] = g[b][a] = true;
}
final int mx = 1<<n;
long[][] dp = new long[mx][n];
long res = 0;
for (int mask = 0; mask < mx; ++mask)
for (int i = 0; i < n; ++i) {
if (mask == (1 << i)) {
dp[mask][i] = 1;
} else if (((mask & (1 << i)) != 0) && ((mask & ((1 << i) - 1)) != 0)) {
long r = 0;
int next = mask ^ (1<<i);
for (int j = 0; j < n; ++j) if (g[i][j]) {
r += dp[next][j];
}
dp[mask][i] = r;
} else {
dp[mask][i] = 0;
}
if ((mask & (mask-1)) != 0 && g[i][lowestBit(mask)]) {
res += dp[mask][i];
}
}
System.out.println((res-m)/2);
}
private static int lowestBit(int mask) {
for (int i = 0;;++i) {
if ((mask & (1<<i)) > 0) {
return i;
}
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.StringTokenizer;
public class Main11D {
private FastScanner in;
private PrintWriter out;
public void solve() throws IOException {
int N = in.nextInt();
int M = in.nextInt();
int[][] edges = new int[N][N];
for(int i = 0; i < M; i++){
int a = in.nextInt() - 1;
int b = in.nextInt() - 1;
edges[a][b] = 1;
edges[b][a] = 1;
}
int globalCountMasks = 1 << N;
int[][] masks = new int[N + 1][];
int[] countMasks = new int[N + 1];
for(int i = 0; i <= N; i++){
masks[i] = new int[combinations(N, i)];
}
for(int i = 0; i < globalCountMasks; i++){
int c = countBit1(i);
masks[c][countMasks[c]] = i;
countMasks[c]++;
}
long globalCountCycles = 0;
long[][] count = new long[globalCountMasks][N];
for(int a = 0; a < N - 2; a++){
int aBit = 1 << a;
count[aBit][a] = 1;
long countCycles = 0;
for(int i = 2; i <= N; i++){
for(int m = 0; m < countMasks[i]; m++){
int mask = masks[i][m];
if((mask & aBit) == 0) continue;
if((mask & (aBit - 1)) > 0) continue;
count[mask][a] = 0;
for(int v = a + 1; v < N; v++){
int vBit = 1 << v;
if((mask & vBit) == 0) continue;
count[mask][v] = 0;
for(int t = a; t < N; t++){
if((mask & (1 << t)) == 0 || t == v || edges[v][t] == 0) continue;
count[mask][v] += count[mask ^ vBit][t];
}
if(edges[a][v] == 1 && mask != (aBit | vBit)){
countCycles += count[mask][v];
}
}
}
}
globalCountCycles += countCycles / 2;
}
out.println(globalCountCycles);
}
private int countBit1(int k){
int c = 0;
while(k > 0){
c += k & 1;
k >>= 1;
}
return c;
}
private int combinations(int n, int k){
if(k > n || k < 0){
throw new IllegalArgumentException();
}
int r = 1;
for(int i = 1; i <= k; i++){
r = r * (n + 1 - i) / i;
}
return r;
}
public void run() {
try {
in = new FastScanner(System.in);
out = new PrintWriter(System.out);
solve();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
class FastScanner {
BufferedReader br;
StringTokenizer st;
FastScanner(InputStream is) {
br = new BufferedReader(new InputStreamReader(is));
}
String next() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
}
public static void main(String[] arg) {
new Main11D().run();
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
import javax.sound.midi.Synthesizer;
public class Main {
static int V;
static ArrayList<Integer> adjList [];
static int first(int a){
int idx = 0;
while (a > 0 && (a & 1) == 0) {
idx++;
a>>=1;
}
return idx;
}
static long Number_Of_Simple_Cycles () { // Time Complexity O(2 ^ n * n ^ 2)
long dp [][] = new long[1 << V][V];
for (int i = 0 ; i < V ; ++i)
dp[1 << i][i] = 1;
for (int mask = 1 ; mask < 1 << V ; ++mask) {
if (Integer.bitCount(mask) <= 1) continue;
for (int current = 0 ; current < V ; ++current) {
if (((1 << current) & mask) == 0) continue;
for (int last : adjList[current])
if (current != first(mask))
{
dp[mask][current] += dp[mask ^ (1 << current)][last];
}
}
}
long ans = 0 ;
int allVisited = (1 << V) - 1;
for (int mask = 1 ; mask < 1 << V ; ++mask) {
if (Integer.bitCount(mask) < 3) continue;
for (int u = 0 ; u < V ; ++u) {
if (adjList[u].contains(first (mask)))
ans += dp[mask][u];
}
}
return ans >> 1;
}
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
StringBuilder sb = new StringBuilder();
PrintWriter out = new PrintWriter(System.out);
V = sc.nextInt();
adjList = new ArrayList[V];
for (int i = 0 ; i < V ; ++i) adjList[i] = new ArrayList<>();
int E = sc.nextInt();
while (E -- > 0) {
int v = sc.nextInt() - 1;
int u = sc.nextInt() - 1;
adjList[v].add(u);
adjList[u].add(v);
}
out.print(Number_Of_Simple_Cycles());
out.flush();
out.close();
}
static class Scanner {
StringTokenizer st;
BufferedReader br;
public Scanner(InputStream s) {
br = new BufferedReader(new InputStreamReader(s));
}
public String next() throws IOException {
while (st == null || !st.hasMoreTokens())
st = new StringTokenizer(br.readLine());
return st.nextToken();
}
public int nextInt() throws IOException {
return Integer.parseInt(next());
}
public long nextLong() throws IOException {
return Long.parseLong(next());
}
public String nextLine() throws IOException {
return br.readLine();
}
public double nextDouble() throws IOException {
String x = next();
StringBuilder sb = new StringBuilder("0");
double res = 0, f = 1;
boolean dec = false, neg = false;
int start = 0;
if (x.charAt(0) == '-') {
neg = true;
start++;
}
for (int i = start; i < x.length(); i++)
if (x.charAt(i) == '.') {
res = Long.parseLong(sb.toString());
sb = new StringBuilder("0");
dec = true;
} else {
sb.append(x.charAt(i));
if (dec)
f *= 10;
}
res += Long.parseLong(sb.toString()) / f;
return res * (neg ? -1 : 1);
}
public boolean ready() throws IOException {
return br.ready();
}
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
public class cf11d {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int m = in.nextInt();
boolean[][] g = new boolean[n][n];
boolean[] ok = new boolean[1<<n];
int[] f = new int[1<<n];
for(int i=1; i<(1<<n); i++) {
ok[i] = Integer.bitCount(i)>=3;
f[i] = first(i);
}
for(int i=0; i<m; i++) {
int a = in.nextInt()-1;
int b = in.nextInt()-1;
g[a][b] = g[b][a] = true;
}
long[][] dp = new long[n][1<<n];
for(int i=0; i<n; i++)
dp[i][1<<i] = 1;
for(int i=1; i<(1<<n); i++)
for(int j=0; j<n; j++)
for(int k=f[i]+1; k<n; k++)
if((i&(1<<k)) == 0 && g[j][k])
dp[k][i^(1<<k)] += dp[j][i];
long ret = 0;
for(int i=1; i<(1<<n); i++)
for(int j=0; j<n; j++)
if(ok[i] && j != f[i])
ret += g[j][f[i]]?dp[j][i]:0;
System.out.println(ret/2);
}
static int first(int x) {
int ret = 0;
while(x%2==0) {
x/=2;
ret++;
}
return ret;
}
}
/*
19 171
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
1 11
1 12
1 13
1 14
1 15
1 16
1 17
1 18
1 19
2 3
2 4
2 5
2 6
2 7
2 8
2 9
2 10
2 11
2 12
2 13
2 14
2 15
2 16
2 17
2 18
2 19
3 4
3 5
3 6
3 7
3 8
3 9
3 10
3 11
3 12
3 13
3 14
3 15
3 16
3 17
3 18
3 19
4 5
4 6
4 7
4 8
4 9
4 10
4 11
4 12
4 13
4 14
4 15
4 16
4 17
4 18
4 19
5 6
5 7
5 8
5 9
5 10
5 11
5 12
5 13
5 14
5 15
5 16
5 17
5 18
5 19
6 7
6 8
6 9
6 10
6 11
6 12
6 13
6 14
6 15
6 16
6 17
6 18
6 19
7 8
7 9
7 10
7 11
7 12
7 13
7 14
7 15
7 16
7 17
7 18
7 19
8 9
8 10
8 11
8 12
8 13
8 14
8 15
8 16
8 17
8 18
8 19
9 10
9 11
9 12
9 13
9 14
9 15
9 16
9 17
9 18
9 19
10 11
10 12
10 13
10 14
10 15
10 16
10 17
10 18
10 19
11 12
11 13
11 14
11 15
11 16
11 17
11 18
11 19
12 13
12 14
12 15
12 16
12 17
12 18
12 19
13 14
13 15
13 16
13 17
13 18
13 19
14 15
14 16
14 17
14 18
14 19
15 16
15 17
15 18
15 19
16 17
16 18
16 19
17 18
17 19
18 19
*/ | np | 11_D. A Simple Task | CODEFORCES |
//package round11;
import java.io.BufferedOutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringReader;
import java.util.Arrays;
import java.util.Scanner;
public class D {
private Scanner in;
private PrintWriter out;
private boolean[][] g;
public void solve()
{
n = ni();
int m = ni();
g = new boolean[n][n];
for(int i = 0;i < m;i++){
int f = ni();
int t = ni();
g[f-1][t-1] = true;
g[t-1][f-1] = true;
}
long ret = 0L;
cache = new long[20 << 19];
for(int i = 0;i < n;i++){
start = i;
ret += rec(1 << start, i, 0);
}
out.println(ret/2);
}
private long[] cache;
private int n;
private int start;
private long rec(int passed, int cur, int depth)
{
int code = cur << 19 | passed;
if(cache[code] != 0)return cache[code];
long ret = 0L;
if(g[cur][start] && depth >= 2)ret++;
for(int i = start + 1;i < n;i++){
if((passed & (1 << i)) == 0 && g[cur][i]){
ret += rec(passed | (1 << i), i, depth + 1);
}
}
cache[code] = ret;
return ret;
}
public void run() throws Exception
{
// int m = 19;
// StringBuilder sb = new StringBuilder();
// sb.append(m + " ");
// sb.append((m*(m-1)/2) + " ");
// for(int i = 1;i <= m;i++){
// for(int j = i + 1;j <= m;j++){
// sb.append(i + " " + j + "\n");
// }
// }
//
// in = new Scanner(new StringReader(sb.toString()));
// in = new Scanner(new StringReader("4 6 1 2 1 3 1 4 2 3 2 4 3 4"));
in = new Scanner(System.in);
System.setOut(new PrintStream(new BufferedOutputStream(System.out)));
out = new PrintWriter(System.out);
// int n = in.nextInt();
int n = 1;
for(int i = 1;i <= n;i++){
long t = System.currentTimeMillis();
solve();
out.flush();
System.err.printf("%04d/%04d %7d%n", i, n, System.currentTimeMillis() - t);
}
}
public static void main(String[] args) throws Exception
{
new D().run();
}
private int ni() { return Integer.parseInt(in.next()); }
private static void tr(Object... o) { System.out.println(o.length == 1 ? o[0] : Arrays.toString(o)); }
private void tra(int[] a) {System.out.println(Arrays.toString(a));}
private void tra(int[][] a)
{
for(int[] e : a){
System.out.println(Arrays.toString(e));
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
public class B {
static int first(int n)
{
int res = 0;
while(n > 0 && (n & 1) == 0){
n >>= 1;
res++;
}
return res;
}
public static void main(String[] args) throws Exception
{
Scanner bf = new Scanner(System.in);
PrintWriter out = new PrintWriter(System.out);
int n = bf.nextInt(), m = bf.nextInt();
ArrayList<Integer> [] adjList = new ArrayList[n];
for (int i = 0; i < adjList.length; i++)
{
adjList[i] = new ArrayList<Integer>();
}
for (int i = 0; i < m; i++)
{
int u = bf.nextInt()-1, v = bf.nextInt()-1;
adjList[u].add(v);
adjList[v].add(u);
}
long [][] memo = new long[(1<<n)][n];
for (int i = 0; i < n; i++)
{
memo[1<<i][i] = 1;
}
long ans = 0;
for (int i = 1; i < 1<<n; i++)
{
if(Integer.bitCount(i) == 1) continue;
for (int j = 0; j < n; j++)
{
if((i & (1<<j)) == 0 || j == first(i)) continue;
for(int v:adjList[j])
memo[i][j] += memo[i^(1<<j)][v];
}
}
for (int i = 1; i < 1<<n; i++)
{
if(Integer.bitCount(i) < 3) continue;
int t = first(i);
for (int j = 0; j < n; j++)
{
if(adjList[j].contains(t))
ans += memo[i][j];
}
}
out.println(ans/2);
out.flush();
out.close();
}
static class Scanner {
StringTokenizer st;
BufferedReader br;
public Scanner(InputStream s)
{
br = new BufferedReader(new InputStreamReader(s));
}
public Scanner(FileReader fileReader)
{
br = new BufferedReader(fileReader);
}
public String next() throws IOException
{
while (st == null || !st.hasMoreTokens())
st = new StringTokenizer(br.readLine());
return st.nextToken();
}
public int nextInt() throws IOException
{
return Integer.parseInt(next());
}
public long nextLong() throws IOException
{
return Long.parseLong(next());
}
public String nextLine() throws IOException
{
return br.readLine();
}
public boolean ready() throws IOException
{
return br.ready();
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Main {
static long[][] memo;
static boolean[][] adjMat;
static int N, endNode;
static ArrayList<Integer>[] bits;
static long dp(int idx, int msk) //complexity = N * 2^(N + 1)
{
if(memo[idx][msk] != -1)
return memo[idx][msk];
long ret = adjMat[idx][endNode] ? 1 : 0;
for(int i = 0, sz = bits[msk].size(); i < sz; ++i)
{
int j = bits[msk].get(i);
if(j > endNode)
break;
if(adjMat[idx][j])
ret += dp(j, msk | 1 << j);
}
return memo[idx][msk] = ret;
}
public static void main(String[] args) throws IOException {
Scanner sc = new Scanner(System.in);
PrintWriter out = new PrintWriter(System.out);
N = sc.nextInt();
adjMat = new boolean[N][N];
bits = new ArrayList[1 << N];
for(int i = 0; i < 1 << N; ++i)
{
bits[i] = new ArrayList<>(1);
for(int j = 0; j < N; ++j)
if((i & 1 << j) == 0)
bits[i].add(j);
}
int M = sc.nextInt();
while(M-->0)
{
int u = sc.nextInt() - 1, v = sc.nextInt() - 1;
adjMat[u][v] = adjMat[v][u] = true;
}
long ans = 0;
for(int i = N; i > 1; --i)
{
memo = new long[i][1 << i];
for(long[] x: memo)
Arrays.fill(x, -1);
ans += dp(endNode = i - 1, 1 << endNode);
}
for(int i = 0; i < N; ++i)
for(int j = i + 1; j < N; ++j)
if(adjMat[i][j])
--ans;
out.println(ans >> 1);
out.flush();
out.close();
}
static class Scanner
{
StringTokenizer st;
BufferedReader br;
public Scanner(InputStream s){ br = new BufferedReader(new InputStreamReader(s));}
public String next() throws IOException
{
while (st == null || !st.hasMoreTokens())
st = new StringTokenizer(br.readLine());
return st.nextToken();
}
public int nextInt() throws IOException {return Integer.parseInt(next());}
public long nextLong() throws IOException {return Long.parseLong(next());}
public String nextLine() throws IOException {return br.readLine();}
public double nextDouble() throws IOException { return Double.parseDouble(next()); }
public boolean ready() throws IOException {return br.ready();}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class D11 {
static boolean[][] g;
static int n, m;
public static void main(String[] args) throws IOException {
input.init(System.in);
PrintWriter out = new PrintWriter(System.out);
n = input.nextInt();
m = input.nextInt();
g = new boolean[n][n];
for(int i = 0; i<m; i++)
{
int a = input.nextInt()-1, b = input.nextInt()-1;
g[a][b] = g[b][a] = true;
}
long res = 0;
map = new HashMap<Integer, Long>();
for(int i = n-1; i>=0; i--)
{
memo = new long[i+1][1<<(i+1)];
for(long[] A : memo) Arrays.fill(A, -1);
res += count(i, i, 1<<i)/2;
}
out.println(res);
out.close();
}
static long[][] memo;
static HashMap<Integer, Long> map;
static long count(int at, int start, int mask)
{
if(memo[at][mask] != -1) return memo[at][mask];
int bits = Integer.bitCount(mask);
if(at == start && bits > 2) return 1;
long res = 0;
for(int i = 0; i<=start; i++)
{
if(!g[at][i]) continue;
if(i != start && (mask & (1<<i)) > 0) continue;
if(i == start && bits <= 2) continue;
res += count(i, start, mask | (1<<i));
}
return memo[at][mask] = res;
}
public static class input {
static BufferedReader reader;
static StringTokenizer tokenizer;
static void init(InputStream input) {
reader = new BufferedReader(new InputStreamReader(input));
tokenizer = new StringTokenizer("");
}
static String next() throws IOException {
while (!tokenizer.hasMoreTokens())
tokenizer = new StringTokenizer(reader.readLine());
return tokenizer.nextToken();
}
static int nextInt() throws IOException {
return Integer.parseInt(next());
}
static double nextDouble() throws IOException {
return Double.parseDouble(next());
}
static long nextLong() throws IOException {
return Long.parseLong(next());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.InputStreamReader;
import java.io.IOException;
/**
* Built using CHelper plug-in
* Actual solution is at the top
*
* @author ATailouloute
*/
public class Main {
public static void main(String[] args) {
InputStream inputStream = System.in;
OutputStream outputStream = System.out;
QuickScanner in = new QuickScanner(inputStream);
PrintWriter out = new PrintWriter(outputStream);
TaskD solver = new TaskD();
solver.solve(1, in, out);
out.close();
}
static class TaskD {
public void solve(int testNumber, QuickScanner in, PrintWriter out) {
int n = in.nextInt();
int m = in.nextInt();
boolean[][] is = new boolean[n][n];
for (int i = 0; i < n; i++) {
is[i][i] = true;
}
long[][] dp = new long[1 << n | 1][n];
for (int i = 0; i < m; i++) {
int u = in.nextInt() - 1;
int v = in.nextInt() - 1;
is[u][v] = is[v][u] = true;
dp[(1 << u) + (1 << v)][v] = 1;
dp[(1 << u) + (1 << v)][u] = 1;
}
int k = 0;
long res = 0;
for (int mask = 1; mask < 1 << n; ++mask) {
boolean f = true;
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) != 0 && dp[mask][i] == 0) {
if (f) {
f = false;
k = i;
} else {
for (int j = k + 1; j < n; j++) {
if ((mask & (1 << j)) != 0 && is[i][j]) {
dp[mask][i] += dp[mask - (1 << i)][j];
}
}
}
if (is[k][i]) res += dp[mask][i];
}
}
}
out.println(res >> 1);
}
}
static class QuickScanner {
BufferedReader br;
StringTokenizer st;
InputStream is;
public QuickScanner(InputStream stream) {
is = stream;
br = new BufferedReader(new InputStreamReader(stream), 32768);
}
String nextToken() {
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(nextToken());
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Scanner;
public class Main implements Runnable {
/**
* @param args
*/
public static void main(String[] args) {
new Thread(new Main()).start();
}
public void run() {
Locale.setDefault(Locale.US);
try {
run1();
} catch (IOException e) {
throw new RuntimeException();
}
}
int nextInt(StreamTokenizer st) throws IOException {
st.nextToken();
return (int) st.nval;
}
private List<Integer> kmp(String x, String a) {
String s = a + "$" + x;
int[] oppa = new int[s.length()];
oppa[0] = 0;
int tmp = 0;
List<Integer> res = new ArrayList<Integer>();
for (int i = 1; i < s.length(); i++) {
while (tmp != 0 && s.charAt(tmp) != s.charAt(i)) {
// System.out.println(i + " " + tmp);
tmp = oppa[tmp - 1];
}
if (s.charAt(tmp) == s.charAt(i))
tmp++;
oppa[i] = tmp;
if (tmp == a.length()) {
res.add(i - a.length() - a.length());
}
}
return res;
}
double nextDouble(StreamTokenizer st) throws IOException {
st.nextToken();
return st.nval;
}
String nextLine(StreamTokenizer st) throws IOException {
st.nextToken();
return st.sval;
}
public void run1() throws IOException {
Scanner sc = new Scanner(new InputStreamReader(System.in));
// Scanner sc = new Scanner(new FileReader("input.txt"));
int n = sc.nextInt();
int m = sc.nextInt();
boolean[][] arr = new boolean[n][n];
for (int i = 0; i < m; i++) {
int a = sc.nextInt();
int b = sc.nextInt();
arr[a - 1][b - 1] = true;
arr[b - 1][a - 1] = true;
}
long[][] res = new long[n][1 << n];
for (int mask = 1; mask < (1 << n); mask++) {
int min = -1;
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) != 0) {
if (min == -1) {
min = i;
if (mask == (1 << min))
res[min][mask] = 1;
}
for (int j = min + 1; j < n; j++)
if ((mask & (1 << j)) == 0 && arr[i][j]) {
res[j][mask | (1 << j)] += res[i][mask];
}
}
}
}
long r = 0;
for (int mask = 1; mask < (1 << n); mask++)
if (Integer.bitCount(mask) != 2)
for (int j = 0; j < n; j++) {
int i = 0;
while ((mask & (1 << i)) == 0)
i++;
if (arr[i][j])
r += res[j][mask];
}
System.out.println(r / 2);
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.TreeSet;
public class D {
static boolean[][] adj;
static int n;
static int first;
public static void main(String[] args) throws IOException {
InputReader in = new InputReader();
n = in.nextInt();
// n = 19;?
int m = in.nextInt();
adj = new boolean[n][n];
// for (int i = 0; i < n; i++) {
// for (int j = 0; j < n; j++) {
// adj[i][j] = true;
// }
// }
dp = new long[1 << n][n];
for (int i = 0; i < m; i++) {
int f = in.nextInt() - 1;
int t = in.nextInt() - 1;
adj[f][t] = adj[t][f] = true;
}
boolean[] v = new boolean[1 << n];
long res = 0;
for (int f = 0; f < n; f++) {
first = f;
int cnt;
for (int i = 0; i < 1 << n; i+=(1<<first))
if ((i & (1 << first)) == 0)
for (int j = 0; j < n; j++)
dp[i][j] = -1;
for (int i = 0; i < 1 << n; i+= (1<<first)) {
cnt = Integer.bitCount(i);
if ((i & (1 << first)) == 0 && !v[i | (1 << first)] && cnt > 1) {
v[i | (1 << first)] = true;
res += solve(i, first, cnt);
}
}
}
System.out.println(res / 2);
}
static long[][] dp;
public static long solve(int msk, int lst, int cnt) {
if (cnt == 0)
return (adj[lst][first]) ? 1 : 0;
if (dp[msk][lst] != -1)
return dp[msk][lst];
long res = 0;
for (int i = 0; i < n; i++)
if (adj[lst][i] && (msk & (1 << i)) > 0)
res += solve(msk ^ (1 << i), i, cnt - 1);
return dp[msk][lst] = res;
}
static class InputReader {
BufferedReader in;
StringTokenizer st;
public InputReader() throws IOException {
in = new BufferedReader(new InputStreamReader(System.in));
st = new StringTokenizer(in.readLine());
}
public String next() throws IOException {
while (!st.hasMoreElements())
st = new StringTokenizer(in.readLine());
return st.nextToken();
}
public int nextInt() throws NumberFormatException, IOException {
return Integer.parseInt(next());
}
public long nextLong() throws NumberFormatException, IOException {
return Long.parseLong(next());
}
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while ( sc.hasNextInt() ) {
int n = sc.nextInt();
long m = sc.nextInt();
boolean edge[][] = new boolean[n][n];
long dp[][] = new long[1<<n][n];
for ( long i = 1 ; i<=m ; ++i ) {
int u = sc.nextInt();
int v = sc.nextInt();
-- u;
-- v;
edge[u][v] = edge[v][u] = true;
}
for ( int i = 0 ; i<n ; ++i ) {
dp[1<<i][i] = 1;
}
long res = 0;
for ( int i = 1 ; i<(1<<n) ; ++i ) {
int first = cal(i);
for ( int j = 0 ; j<n ; ++j ) {
if ( dp[i][j]==0 ) {
continue;
}
for ( int k = first ; k<n ; ++k ) {
if ( j==k || !edge[j][k] ) {
continue;
}
if ( k==first && (i&(1<<k))!=0 ) {
res += dp[i][j];
}
if ( (i&(1<<k))==0 ) {
dp[i|(1<<k)][k] += dp[i][j];
}
}
}
}
res -= m;
System.out.println(res/2);
}
}
public static int cal( int x ) {
int ord = 0;
while ( true ) {
if ( (x&(1<<ord))!=0 ) {
break;
}
++ ord;
}
return ord;
}
public static boolean judge( int x ) {
int cnt = 0;
while ( x>=1 ) {
if ( (x&1)==1 ) {
++ cnt;
}
x >>= 1;
}
return cnt >= 3;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
/**
* Created by Tejas on 18-10-2018.
*/
public class Main {
static HashSet<Integer> adjList[];
public static void main(String[]args)throws IOException{
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(System.in));
StringBuilder stringBuilder=new StringBuilder();
String temp[]=bufferedReader.readLine().split(" ");
int V=Integer.parseInt(temp[0]);
int E=Integer.parseInt(temp[1]);
adjList=new HashSet[V];
for(int i=0;i<V;i++)
adjList[i]=new HashSet<>();
for(int i=0;i<E;i++){
temp=bufferedReader.readLine().split(" ");
int x=Integer.parseInt(temp[0])-1;
int y=Integer.parseInt(temp[1])-1;
adjList[y].add(x);
adjList[x].add(y);
}
stringBuilder.append(solve(V)+"\n");
System.out.println(stringBuilder);
}
private static long solve(int V) {
long dp[][]=new long[(1<<V)][V];
for(int i=0;i<V;i++)
dp[(1<<i)][i]=1;
for(int mask=1;mask<(1<<V);mask++){
// HW starting at pos first and ending at j.
int first = Integer.numberOfTrailingZeros(mask);
for(int i=0;i<V;i++){
if((mask&(1<<i))==0 || first==i) continue;
for (int j = 0; j < V; j++)
if (adjList[i].contains(j) && (mask & (1<<j))!=0)
dp[mask][i] += dp[mask ^ (1 << i)][j];
}
}
//Calculating simple cycles
long count=0;
for(int mask=1;mask<(1<<V);mask++) {
int first = Integer.numberOfTrailingZeros(mask);
if (Integer.bitCount(mask)>=3)
for (int i = 0; i < V; i++) {
if(adjList[first].contains(i))
count+=dp[mask][i];
}
}
return count/2;
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.text.*;
import java.math.*;
import java.util.*;
public class Main {
private StreamTokenizer in;
private BufferedWriter out;
public void solve() throws Exception {
int n = nextInt(), m = nextInt();
int[] ss = new int[n];
for (int i=0; i<m; i++)
{
int a = nextInt(), b = nextInt();
a--;b--;
ss[a]|=1<<b;
ss[b]|=1<<a;
}
long[][] res = new long[n][1<<n];
int[] cnt = new int[1<<n], first = new int[1<<n];
for (int i=0; i<n; i++)
{
res[i][1<<i] = 1;
first[1<<i] = i;
cnt[1<<i] = 1;
}
long ans = 0;
for (int mask = 0; mask<1<<n; mask++)
{
for (int last = first[mask]; last<n; last++)
{
if (res[last][mask]==0)
continue;
if (cnt[mask]>2)
{
if ((ss[last]&(1<<first[mask]))!=0)
ans+=res[last][mask];
}
int m2 = (~mask) & ss[last];
for (int next = first[mask]+1; next<n; next++)
{
if ((m2&(1<<next))==0) continue;
int mask2 = mask|1<<next;
res[next][mask2]+=res[last][mask];
cnt[mask2] = cnt[mask]+1;
first[mask2] = first[mask];
}
}
}
ans/=2;
out.write(ans+"\n");
}
public int nextInt() throws Exception
{
in.nextToken();
return (int)in.nval;
}
public void run() {
try {
in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
out = new BufferedWriter(new OutputStreamWriter(System.out));
solve();
out.flush();
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
public static void main(String[] args) {
new Main().run();
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.util.Scanner;
import static java.lang.Integer.bitCount;
import static java.lang.Integer.numberOfTrailingZeros;
import static java.lang.System.out;
/**
* 11D
*
* @author artyom
*/
public class ASimpleTask {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[][] d = new int[n][n];
for (int i = 0, m = sc.nextInt(); i < m; i++) {
int a = sc.nextInt() - 1, b = sc.nextInt() - 1;
d[a][b] = 1;
d[b][a] = 1;
}
long[][] dp = new long[1 << n][n];
// SOLUTION BEGINS
for (int mask = 1; mask < 1 << n; mask++) {
int start = numberOfTrailingZeros(mask); // the starting vertex of a Hamiltonian walk
if (bitCount(mask) == 1) {
dp[mask][start] = 1;
continue;
}
for (int i = 0; i < n; i++) {
if ((mask & (1 << i)) > 0 && i != start) {
int xmask = mask ^ (1 << i); // mask without vertex i
for (int j = 0; j < n; j++) {
if (d[j][i] > 0) {
dp[mask][i] += dp[xmask][j];
}
}
}
}
}
// SOLUTION ENDS
long sum = 0;
for (int mask = 1; mask < 1 << n; mask++) {
if (bitCount(mask) >= 3) { // We need at least 3 vertices for a cycle
for (int i = 0; i < n; i++) {
if (d[numberOfTrailingZeros(mask)][i] > 0) {
sum += dp[mask][i];
}
}
}
}
out.print(sum / 2);
}
} | np | 11_D. A Simple Task | CODEFORCES |
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.StringTokenizer;
public class Main implements Runnable {
int n;
long[][] f;
boolean[][] e;
int bit(int value) {
return (1<<value);
}
void solve() throws IOException {
n = nextInt();
int m = nextInt();
f = new long[1<<n][n];
e = new boolean[n][n];
for (int i = 0; i < (1<<n); ++i) {
for (int j = 0; j < n; ++j) {
f[i][j] = -1;
}
}
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
f[bit(i)|bit(j)][j] = 0;
e[i][j] = false;
}
}
for (int i = 0; i < m; ++i) {
int u = nextInt()-1;
int v = nextInt()-1;
e[u][v] = true;
e[v][u] = true;
if (u < v) {
f[bit(u)|bit(v)][v] = 1;
}
else {
f[bit(v)|bit(u)][u] = 1;
}
}
long answer = 0;
for (int i = 1; i < (1<<n); ++i) {
int start = 0;
while (((1<<start)&i) == 0) {
++start;
}
int s = bit(start);
for (int nxt = start+1; nxt < n; ++nxt) {
int b = bit(nxt);
if ((b&i) > 0 && (b|s) != i) {
if (e[start][nxt]) {
answer += clc(i, nxt);
}
}
}
}
writer.print(answer>>1);
}
long clc(int maska, int last) {
if (f[maska][last] == -1) {
int first = 0;
while (((1<<first)&maska) == 0) {
++first;
}
f[maska][last] = 0;
for (int b = first+1; b < n; ++b) {
if ((bit(b)&maska)>0) {
if (e[b][last]) {
f[maska][last] += clc(maska^bit(last), b);
}
}
}
}
return f[maska][last];
}
public static void main(String[] args) throws InterruptedException {
new Thread(null, new Runnable() {
public void run() {
new Main().run();
}
},
"1",
1 << 25).start();
}
@Override
public void run() {
try {
boolean fromStandart = true;
reader = new BufferedReader(fromStandart ? new InputStreamReader(System.in) : new FileReader(INFILE));
writer = new PrintWriter(new BufferedWriter(fromStandart ? new OutputStreamWriter(System.out) : new FileWriter(OUTFILE)));
tokenizer = null;
solve();
writer.flush();
} catch (Exception error) {
error.printStackTrace();
System.exit(1);
}
}
static final String INFILE = "input.txt";
static final String OUTFILE = "output.txt";
BufferedReader reader;
StringTokenizer tokenizer;
PrintWriter writer;
int nextInt() throws IOException {
return Integer.parseInt(nextToken());
}
long nextLong() throws IOException {
return Long.parseLong(nextToken());
}
double nextDouble() throws IOException {
return Double.parseDouble(nextToken());
}
String nextString() throws IOException {
return reader.readLine();
}
String nextToken() throws IOException {
while (tokenizer == null || !tokenizer.hasMoreTokens()) {
tokenizer = new StringTokenizer(reader.readLine());
}
return tokenizer.nextToken();
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import java.io.*;
import java.util.*;
public class D11 {
static HashMap<State, Integer> map;
static long[][] ans;
static boolean[][] connect;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int n = Integer.parseInt(st.nextToken());
map = new HashMap<State, Integer>();
connect = new boolean[n][n];
ans = new long[n][1<<n];
for(int i = 0; i < n; i++)
Arrays.fill(ans[i], -1);
int m = Integer.parseInt(st.nextToken());
while(m-- > 0) {
st = new StringTokenizer(br.readLine());
int a = Integer.parseInt(st.nextToken());
int b = Integer.parseInt(st.nextToken());
a--;
b--;
connect[a][b] = connect[b][a] = true;
}
long ret = 0;
int mask = 1 << n;
mask--;
for(int i = 0; i < n; i++) {
for(int out = i+1; out < n; out++) {
if(connect[i][out]) {
ret += solve(mask - (1<<out), out, true);
}
}
mask -= (1<<i);
}
System.out.println(ret/2);
}
public static long solve(int mask, int start, boolean a) {
if(ans[start][mask] != -1)
return ans[start][mask];
int end = 0;
while((mask & (1<<end)) == 0)
end++;
long ret = 0;
for(int out = 0; out < connect.length; out++) {
if(connect[start][out] && (mask & (1 << out)) != 0) {
if(out == end) {
if(!a)
ret++;
}
else
ret += solve(mask - (1<<out), out, false);
}
}
ans[start][mask] = ret;
return ret;
}
static class State {
public byte start, go;
public int mask;
public State(byte a, byte b, int c) {
start = a;
go = b;
mask = c;
}
public int hashCode() {
return 10007*mask + 43 * start + go;
}
public boolean equals(Object o) {
State s = (State)o;
return start == s.start && go == s.go && mask == s.mask;
}
}
}
| np | 11_D. A Simple Task | CODEFORCES |
import javafx.util.Pair;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.HashMap;
public class ElongatedMatrix {
private static int n;
/**
* if the rows are arranged in some permutation [p_1, p_2,...i,j,...p_n],
* 1!=i!=j!=n, minCost[i][j] is the min k for any permutation with i&j adjacent
**/
private static int[][] minCost;
/**
* minCostEndpoints[i][j] is the min k for any permutation such that
* the rows are arranged in some permutation [i, p_2, ... p_{n-1}, j],
**/
private static int[][] minCostEndpoints;
/**
* Max k of a path over a subset of all rows ending at a certain vertex
* The first 16 bits of the key represent the subset. Node n is in the subset iff (x & (2 << n))!=0
* key/(1<<16) is the end vertex number
*/
private static HashMap<Integer, Integer> costs = new HashMap<>();
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int[] params = Arrays.stream(br.readLine().split(" "))
.mapToInt(x -> Integer.parseInt(x)).toArray();
n = params[0];
int m = params[1];
int[][] matrix = new int[n][m];
for (int i = 0; i < n; i++) {
matrix[i] = Arrays.stream(br.readLine().split(" "))
.mapToInt(x -> Integer.parseInt(x)).toArray();
}
minCost = new int[n][n];
minCostEndpoints = new int[n][n];
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if (i > j) {
minCost[i][j] = Integer.MAX_VALUE;
for (int k = 0; k < m; k++) {
int diff = Math.abs(matrix[i][k] - matrix[j][k]);
if (diff < minCost[i][j]) {
minCost[i][j] = diff;
}
}
minCost[j][i] = minCost[i][j];
}
minCostEndpoints[i][j] = Integer.MAX_VALUE;
for (int k = 0; k < m - 1; k++) {
int diff = Math.abs(matrix[i][k + 1] - matrix[j][k]);
if (diff < minCostEndpoints[i][j]) {
minCostEndpoints[i][j] = diff;
}
}
}
}
int maxCost = n == 1 ? minCostEndpoints[0][0] : 0;
for (int i = 0; i < n; i++) {
costs.clear();
for (int j = 0; j < n; j++) {
if (i != j) {
int bitmask = (1 << i) | (1 << j);
int state = bitmask + (j << 16);
costs.put(state, minCost[i][j]);
}
}
for (int j = 0; j < n; j++) {
if (i != j) {
if (minCostEndpoints[i][j] <= maxCost) {
continue;
} else {
int pathCost = Math.min(minCostEndpoints[i][j], findMaxCost(i, j, (1 << n) - 1));
maxCost = Math.max(maxCost, pathCost);
}
}
}
}
System.out.println(maxCost);
br.close();
}
//find the minimum cost starting at st, ending at end, and using only the rows in set
private static int findMaxCost(int st, int end, int set) {
int state = set + (end << 16);
if (costs.containsKey(state)) {
return costs.get(state);
}
int maxCost = 0;
for (int i = 0; i < n; i++) {
if (i != st && i != end && (set & (1 << i)) != 0) {
int setWithoutEnd = set - (1 << end);
int pathCost = Math.min(findMaxCost(st, i, setWithoutEnd), minCost[i][end]);
maxCost = Math.max(pathCost, maxCost);
}
}
costs.put(state, maxCost);
return maxCost;
}
}
| np | 1102_F. Elongated Matrix | CODEFORCES |