criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
int N;
char idx;
string str;
int l = 0, r = N - 1;
int idx = 0;
int plus = 0;
string Prev;
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	cin >> N;
	cout << 0;
	cin >> Prev;
	if (Prev == "Vacant") return 0;
	while (l < r) {
		int mid = (l + r) >> 1;
		cout << mid;
		cin >> str;
		if (str == "Vacant") break;
		if ((mid & 1) && str != Prev) r = mid + 1;
		else if (!(mid & 1) && str == Prev) r = mid + 1;
		else l = mid;
	}
	return 0;
}

Compiler output:
a.cc:9:5: error: conflicting declaration 'int idx'
    9 | int idx = 0;
      |     ^~~
a.cc:6:6: note: previous declaration as 'char idx'
    6 | char idx;
      |      ^~~
Language: Java

import java.util.Scanner;


public class Coder {
	public static void main(String[] args){
		
		Scanner s = new Scanner(System.in);
		
		int n = s.nextInt();
		
		int count=18;
		int i=0;
		int j=n-1;
		int mid;
		String z="";
				
		while(i<j-1){	
			mid = (i+j)/2;
			
			System.out.println(i);			
			System.out.flush();
			String x = s.next();
			if (x.equals("Vacant"))
				System.exit(0);
			
			System.out.println(mid);
			System.out.flush();
		    z = s.next();
			if (z.equals("Vacant"))
				System.exit(0);
			
			if(i%2==mid%2){
				if(x.equals(z))
					i=mid;	
				else
					j=mid;		
			}
			else{
				if(!x.equals(z))
					i=mid;	
				else
					j=mid;	
			}					
			count--;
		}	
		System.out.println(i);
		System.out.flush();
	    z = s.next();
		if (z.equals("Vacant"))
			System.exit(0);
		
		System.out.println(j);
		System.out.flush();
	    z = s.next();
		if (z.equals("Vacant"))
			System.exit(0);
		
	}
}

Compiler output:
Main.java:4: error: class Coder is public, should be declared in a file named Coder.java
public class Coder {
       ^
1 error
Language: C++

#include <stdio.h>

int main()
{
    int n,i,start=0,goal,judge=0,p,search;
    char ans[10],b4ans,turn='l';
    scanf("%d", &n);
    goal = n;
    printf("0\n");
    fflush(stdout);
    scanf("%s", ans);
    if (ans[0] == 'V')
        return 0;
    for (i = 0; i < 19; i++)
    {
        if (judge == 1);
        {
            if (turn == 'l')
                turn = 'r';
            else
                turn = 'l';
        }
        if ((goal - start) % 2 == 0)
            p = (goal - start) / 2;
        else
        {
            if (turn == 'l')
                p = (goal - start + 1) / 2;
            else
                p = (goal - start - 1) / 2;
        }
        search = start + p;
        b4ans = ans[0];
        printf("%d\n", (search));
        fflush(stdout);
        scanf("%s", ans);
        if (ans[0] == 'V')
            return 0;
        if ((search - start) % 2 == 0)
        {
            if (ans[0] == b4ans)
            {
                start = search;
                judge = 0;
            }
            else
            {
                goal = start;
                start = search;
                judge = 1;
            }
        }
        else
        {
            if (ans[0] == b4ans)
            {
                goal = start;
                start = search;
                judge = 1;
            }
            else
            {
                start = search;
                judge = 0;
            }
        }
    }
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:68:14: error: expected '}' at end of input
   68 |     return 0;
      |              ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include<cstdio>
#include<string>
#include<iostream>
#include<cstring>

#define MAX 100005
using namespace std;

int seat[MAX];
int main(void){
	int n;
	memset(seat,0,sizeof(seat));
	scanf("%d",&n);
	int now = 0;
	char s[10];
	int left = 0,right = n;
		printf("%d\n",now);
		fflush(stdout);
		scanf("%s",s);
		if(s[0] == 'M'){
			seat[0] = 1;
			seat[n] = 1;
		}
		if(s[0] == 'F'){
			seat[0] = -1;
			seat[n] = -1;
		}
		if(s[0] == 'V'){
			return 0;
		}
	for(int i = 1; i < 20; i++){
		int mid = left + (right - left)/2;
		printf("%d\n",mid);
		fflush(stdout);
		scanf("%s",s);
		if(s[0] == 'M'){
			seat[mid] = 1;
		}
		if(s[0] == 'F'){
			seat[mid] = -1;
		}
		if(s[0] == 'V')
			return 0;
		int left_mid = seat[mid] + seat[left];
		//和为0则是异性，不为0为同性 
		if((mid - left)%2)  //中间有偶数个，left与mid互为异性 
			if(left_mid != 0) // 同性是不正常 
				right = mid;
		else
			if(left_mid == 0)
				left = mid;
	}
	printf("%d\n",mid);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:53:23: error: 'mid' was not declared in this scope
   53 |         printf("%d\n",mid);
      |                       ^~~
Language: C++


#include <cstdio>
#include <cstdlib>

using namespace std;

int main() {
    register int n;
    scan("%d", &n);

    register int left = 0;
    register int right = n - 1;
    register int center;

    char c;

    printf("%d\n", 0);

    scan("%c", &c);

    if (c == 'M') {

        while (1) {

            center = (left + right) / 2;
            printf("%d\n", center);
            scan("%c", &c);

            if (c == 'M') {
                left = center;
            } else if (c == 'F') {
                right = center;
            } else {
                exit(1);
            }
        }

    } else if (c == 'F') {

        while (1) {

            center = (left + right) / 2;
            printf("%d\n", center);
            scan("%s", &c);

            if (c == 'F') {
                left = center;
            } else if (c == 'M') {
                right = center;
            } else {
                exit(1);
            }
        }
    }
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    8 |     register int n;
      |                  ^
a.cc:9:5: error: 'scan' was not declared in this scope; did you mean 'scanf'?
    9 |     scan("%d", &n);
      |     ^~~~
      |     scanf
a.cc:11:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   11 |     register int left = 0;
      |                  ^~~~
a.cc:12:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   12 |     register int right = n - 1;
      |                  ^~~~~
a.cc:13:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   13 |     register int center;
      |                  ^~~~~~
Language: C++

#include <cstdio>
using namespace std;

int main() {
    register int n;
    scanf("%d", &n);

    register int left = 0;
    register int right = n - 1;
    register int center;

    char c;

    printf("%d\n", 0);

    scanf("%c", &c);

    if (c == 'M') {

        while (1) {

            center = (left + right) / 2;
            printf("%d\n", center);
            scanf("%c", &c);

            if (c == 'M') {
                left = center;
            } else if (c == 'F') {
                right = center;
            } else {
                exit(1);
            }
        }

    } else if (c == 'F') {

        while (1) {

            center = (left + right) / 2;
            printf("%d\n", center);
            scanf("%s", &c);

            if (c == 'F') {
                left = center;
            } else if (c == 'M') {
                right = center;
            } else {
                exit(1);
            }
        }
    }
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    5 |     register int n;
      |                  ^
a.cc:8:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    8 |     register int left = 0;
      |                  ^~~~
a.cc:9:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
    9 |     register int right = n - 1;
      |                  ^~~~~
a.cc:10:18: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   10 |     register int center;
      |                  ^~~~~~
a.cc:31:17: error: 'exit' was not declared in this scope
   31 |                 exit(1);
      |                 ^~~~
a.cc:2:1: note: 'exit' is defined in header '<cstdlib>'; this is probably fixable by adding '#include <cstdlib>'
    1 | #include <cstdio>
  +++ |+#include <cstdlib>
    2 | using namespace std;
a.cc:48:17: error: 'exit' was not declared in this scope
   48 |                 exit(1);
      |                 ^~~~
a.cc:48:17: note: 'exit' is defined in header '<cstdlib>'; this is probably fixable by adding '#include <cstdlib>'
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int ch_ans(string s){
  if(s == "Vacant")return 0;
  if(s == "Male")return 1;
  if(s == "Female")return -1;
  return 0;
}
int main() {
  long long n;
  cin >> n;
  int cheir[n];
  cout << 0;
  int i,ans,r,l;
  string s;
  cin >> s;
  ans=ch_ans(s);
  cheir[0]=ans;
  if(ans == 0)return 0;
  cout << n/2;
  cin >> s;
  ans = ch_ans(s);
  cheir[n/2]=ans;
  if(ans == 0)return 0;
  if(cheir[0]==ans){
    l = 0;
    r = n/2;
  }else{
    l = n/2;
    r = n-1;
  }
  for(i=i;i<20;i++){
    int m = l+(r-l)/2;
    if(l+1==r)cout << r;
    cout << m;
    cin >> s;
    ans = ch_ans(s);
    if(ans == 0)return 0;
    cheir[m] = ans;
    if(chier[l] == ans)l=m;
    else r = m;
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:43:8: error: 'chier' was not declared in this scope; did you mean 'cheir'?
   43 |     if(chier[l] == ans)l=m;
      |        ^~~~~
      |        cheir
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define ll long long
#define f first
#define s second
int n;
int maleBegin = 0 , maleEnd = 0;
int main()
{
	//freopen("input.txt" , "r" , stdin);
	cin >> n;
	int l = 0 , r = n - 1;
	cout << l << endl;
	cout.flush();
	string s;
	cin >> s;
	if(s == "Vacant")
	{
		return 0;
	}
	if(s == "Male")
		maleBegin = 1;
	else
		maleBegin = 0;
	cout << r << endl;
	cout.flush();
	string s;
	cin >> s;
	if(s == "Vacant")
	{
		return 0;
	}
	if(s == "Male")
		maleEnd = 1;
	else
		maleEnd = 0;

	for(int i = 0; i < 18; i++)
	{
		bool maleMid;
		int m = (l + r) / 2;
		cout << m << endl;
		cout.flush();
		string s;
		cin >> s;
		if(s == "Vacant")
		{
			return 0;
		}
		else
		{
			if(s == "Male")
				maleMid = 1;
			else
				maleMid = 0;
		}
		int distLeft = m - l;
		int distRight = r - m;
		if((distRight % 2) && ((maleMid ^ 1) != maleEnd))
		{
			l = m;
			maleBegin = maleMid;
			continue;
		}
		if(not(distRight % 2) && maleMid != maleEnd)
		{
			l = m;
			maleBegin = maleMid;
			continue;
		}
		if((distLeft % 2) && ((maleMid ^ 1) != maleBegin))
		{
			r = m;
			maleEnd = maleMid;
			continue;
		}
		if(not(distLeft % 2) && maleMid != maleEnd)
		{
			r = m;
			maleEnd = maleMid;
			continue;
		}
		cout.flush();
	}

}



Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: redeclaration of 'std::string second'
    7 | #define s second
      |           ^~~~~~
a.cc:29:16: note: in expansion of macro 's'
   29 |         string s;
      |                ^
a.cc:7:11: note: 'std::string second' previously declared here
    7 | #define s second
      |           ^~~~~~
a.cc:17:16: note: in expansion of macro 's'
   17 |         string s;
      |                ^
Language: C++

#include <iostream>
#include <cstdio>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>

using namespace std;

#define PB push_back
#define MP make_pair

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vii;

const int MOD = 1e9+7;
const int INF = 1e9;

int main() {
  int N, left, mid, right;
  bool left_male, mid_male, right_male;
  string str;
  cin >> N;
  left = 0; right = N-1; mid = (right + left) / 2;
  cout << left << endl;
  cin >> str;
  if (str[0] == 'V') return 0;
  left_male = (str[0]=='M') ? true : false;

  cout << mid << endl;
  cin >> str;
  if (str[0] == 'V') return 0;
  mid_male = (str[0]=='M') ? true : false;

  cout << right << endl;
  cin >> str;
  if (str[0] == 'V') return 0;
  right_male = (str[0]=='M') ? true : false;

  if (right_male == mid_male) {
    right = mid;
    right_male = mid_male;
  } else {
    left = mid;
    left_male = mid_male;
  }

  while (true) {
    mid = (right + left) / 2;
    cout << mid << endl;
    cin >> str;
    if (str[0] == 'V') return 0;
    mid_male = (str[0]=='M') ? true : false;

    if (right_male == mid_male) {
      right = mid;
      right_male = mid_male;
    } else {
      left = mid;
      left_male = mid_male;
    }

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:67:2: error: expected '}' at end of input
   67 | }
      |  ^
a.cc:22:12: note: to match this '{'
   22 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int N;
  string ans;
  cin >> N;
  vector<char> v(N, '*');

  {
    cout << 0 << endl; cout << flush;
    cin >> ans;
    if(ans == "Vacant") return 0;
    if(ans == "Male") v[0] = 'M';
    if(ans == "Female") v[0] = 'F';
  }
  {
    cout << N-1 << endl; cout << flush;
    cin >> ans;
    if(ans == "Vacant") return 0;
    if(ans == "Male") v[N-1] = 'M';
    if(ans == "Female") v[N-1] = 'F';
  }

  stack<pair<int,int>> st;
  st.push(make_pair(0, N-1));
  while(!st.empty()){
    pair<int,int> p = st.top(); st.pop();
    if(v[m] == '*'){
      int lb = p.first;
      int ub = p.second;
      int m = (ub-lb)/2;
      cout << m << endl; cout << flush;
      cin >> ans;
      if(ans == "Vacant") return 0;
      if(ans == "Male") v[m] = 'M';
      if(ans == "Female") v[m] = 'F';
    }
    int distl = m-lb+1;
    int distu = ub-m+1;

    if(distl%2==0 && v[lb] == v[m]){
      st.push(make_pair(lb,m));
    }
    if(distl%2==1 && v[lb] != v[m]){
      st.push(make_pair(lb,m));
    }
    if(distu%2==0 && v[m] == v[ub]){
      st.push(make_pair(m,ub));
    }
    if(distu%2==1 && v[m] != v[ub]){
      st.push(make_pair(m,ub));
    }
  }
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:10: error: 'm' was not declared in this scope
   36 |     if(v[m] == '*'){
      |          ^
a.cc:39:11: error: redeclaration of 'int m'
   39 |       int m = (ub-lb)/2;
      |           ^
a.cc:36:10: note: '<typeprefixerror>m' previously declared here
   36 |     if(v[m] == '*'){
      |          ^
a.cc:46:17: error: 'm' was not declared in this scope
   46 |     int distl = m-lb+1;
      |                 ^
a.cc:46:19: error: 'lb' was not declared in this scope; did you mean 'll'?
   46 |     int distl = m-lb+1;
      |                   ^~
      |                   ll
a.cc:47:17: error: 'ub' was not declared in this scope
   47 |     int distu = ub-m+1;
      |                 ^~
Language: C++

#include<cstdlib>
#include<cstdio>
using namespace std;

char s[10];
bool get() {
	scanf("%s", s);
	if (s[0] == 'M') return true;
	else if (s[0] == 'F') return false;
	else exit(0);
}

void check(int left, int right, bool fir) {
	printf("%d\n", (right + left) / 2);
	fflush(stdout);
//	printf(" %d,%d : %d\n", left, right, fir);
	if (((right + left) / 2) % 2 == fir ^ get()) {
		check((right + left) / 2 + 1, right, fir ^ !(((right + left) / 2) % 2));
	} else {
		check(left, (right + left) / 2 - 1, fir);
	}
}
int main() {
	int N;
	scanf("%d", &N);
	printf("0\n");
	fflush(stdout);
	bool fir = get();
	check(0, N - 1, fir);
	for (int i = 0;i < 2;i ++) {
	return 0;
}

/*
まず、分かるように基本的には男性と女性が隣り合わせに座っている
まず、最初のiは0を選ぶとする(どれを選んでも円形なら確率的に等しい)
この時、帰ってきたのがMaleとする(女性でも影響しない、空席なら既に正解しているので考慮する必要がない)
また、Male=0、Female=1とする
次に、N/2を尋ねる
もしも0からN/2までに空席がないならば当然だが(N/2)%2の答えが返るはず
逆にそうでないなら予想と違う答えが返るはず
よって、(N/2)%2の答えならばN/2+1からN-1まで、そうでないなら1からN/2-1までの間に空席がある
以下、同手法を繰り返す

ところでいまだにTLEの理由分かってないんだけど、なんでTLEなの？
……って、行末に改行かよ！さっき見た時に無かったように思えたんだけど！
*/

Compiler output:
a.cc: In function 'int main()':
a.cc:32:2: error: expected '}' at end of input
   32 | }
      |  ^
a.cc:23:12: note: to match this '{'
   23 | int main() {
      |            ^
Language: C++

#include <iostream>
#include <vector>
#include<algorithm>
#include<iomanip>
#include<queue>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define REP(i,m,n) for(int i=m;i<(int)(n);i++)
typedef pair<int,int> pint;
typedef long long ll;
const int inf   = 1<<29;
const ll  longinf = 1LL<<60;
int dx[4]={1,0,-1,0}, dy[4]={0,1,0,-1};

int main(){
  int n;cin>>n;
  string s[n];
  cout<<0<<endl;
  cin>>s[0];
  if(s[0]=="Vacant")return 0;
  int left=0,r=n;
  while(true){
    mid=(left+right)/2;
    cout<<mid<<endl;
    cin>>s[mid];
    if(s[mid]=="Vacant")break;
    if(s[left]==s[mid]&&(mid-left)%2==1)
    {right=mid;continue;};
    if(s[left]!=s[mid]&&(mid-left)%2==0)
      {right=mid;continue;};
    left=mid;
    }
  return 0;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:23:5: error: 'mid' was not declared in this scope
   23 |     mid=(left+right)/2;
      |     ^~~
a.cc:23:14: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   23 |     mid=(left+right)/2;
      |          ~~~~^~~~~~
a.cc:23:21: error: invalid operands of types 'std::ios_base& (*)(std::ios_base&)' and 'int' to binary 'operator/'
   23 |     mid=(left+right)/2;
      |         ~~~~~~~~~~~~^~
      |              |       |
      |              |       int
      |              std::ios_base& (*)(std::ios_base&)
Language: C++

#include <iostream>
#include <algorithm>
#include<string>
#include<cmath>
#include<stack>
#include<queue>
using namespace std;


int main() {
	int n, max, min = 0;
	vector<string> que;
	cin >> n;
	max = n - 1;
	while (max - min > 2) {
		if (que[min].empty()) {
			cout << min << endl;
			cin >> que[min];
			if (que[min] == "Vacant") {
				return 0;
			}
		}
		if (que[max].empty()) {
			cout << max / 2 << endl;
			cin >> que[max / 2];
			if (que[max / 2] == "Vacant") {
				return 0;
			}
		}
		if (que[min] == que[max]) {
			max = max / 2 - 1;
		}
		else {
			min = max / 2 + 1;
		}
		for (int i = min; i <= max; i++) {
			cout << i << endl;
			cin >> que[i];
			if (que[i] == "Vacant") {
				return 0;
		}
	}
	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:44:2: error: expected '}' at end of input
   44 | }
      |  ^
a.cc:10:12: note: to match this '{'
   10 | int main() {
      |            ^
Language: C++

#include <iostream>
#include <string>
using namespace std;

int main(){
	int N;
	string token, temp;
	cin >> N;
	cout << "0" << endl;
	cin >> token;
	int L=0; R=N-1; mid;
	while(1){
		mid = (L+R)/2;
		cout << mid << endl;
		cin >> temp;
		if( temp == "Vacant" ){
			break;
		} else if ( temp == token ){
			L = mid;
		} else {
			R = mid;
		}
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:18: error: 'R' was not declared in this scope
   11 |         int L=0; R=N-1; mid;
      |                  ^
a.cc:11:25: error: 'mid' was not declared in this scope
   11 |         int L=0; R=N-1; mid;
      |                         ^~~
Language: C++

#include <bits/stdc++.h>
#define re return
#define pb push_back
#define po pop_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define ss second.second
#define sf second.first
#define ff first.first
#define fs first.second
#define si size
#define sqrt(x) sqrt(abs(x))
#define mp make_pair
#define pi 3.14159265359
#define er erase
#define in insert
#define em empty
#define ft front
#define fo(i,n) for(i = 0; i < n; i++)
#define ro(i,n) for(i = n - 1; i >= 0; i--)
#define fr(i,j,n) for(i = j; i < n; i++)
#define rf(i,j,n) for(i=n-1;i>=j;i--)
typedef std::vector<int> vi;
typedef std::vector<vi> vvi;
typedef std::pair<int,int> ii;
typedef std::vector<ii> vii;
typedef std::vector<std::string> vs;
typedef double dl;
typedef long double ld;
typedef long long ll;
typedef std::pair<ll, ll> pll;
typedef std::vector<ll> vll;
#define filename ""
using namespace std;
   const int N=(int)1e5;
   int a[N];
int main()
{
    /*
	freopen(filename".in","r",stdin);
	freopen(filename".out","w",stdout);
	*/
	/*
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);
    */
    int n,i;
    cin>>n;
    char s[20];
    gets(s);
    printf("0\n");fflush(stdout);
    gets(s);
    if (s[0]=='V')
    {
        re 0;
    }
    if (s[0]=='M')
    {
        a[0]=1;
    }
    else
    {
        a[0]=0;
    }
    int z=0;
    int x=n-1;
    int c;
    while(z<=x)
    {
        c=(z+x)/2;
        printf("%d\n",c);fflush(stdout);
        gets(s);
        if (s[0]=='V')
        {
            re 0;
        }
        if (s[0]=='M')
        {
            a[c]=1;
        }
        else
        {
            a[c]=0;
        }
        if (abs(a[c]-a[z])==(c-z)%2)
        {
            z=c+1;
        }
        else
        {
            x=c-1;
        }
    }
    re 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:51:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   51 |     gets(s);
      |     ^~~~
      |     getw
Language: C++

#include <iostream>
#include <cstdio>
#include <queue>
#include <algorithm>
#include <cstring>
#include <string>
#include <cmath>
#include <vector>
#include <set>
#include <stack>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <ctime>

using namespace std;

typedef long long			LL;
typedef long double			LD;
typedef unsigned long long	ULL;
typedef unsigned int		UI;

//#define FILE
#define fr			first
#define sc			second
#define mp			make_pair
#define pub			push_back
#define all(x)		(x).begin(), (x).end()
#define sz(x)		LL((x).size())
#define F(i,a,b)	for (int i = a; i < b; i++)
#define R(i,a,b)	for (int i = a - 1; i >= b; i--)

const UI		N = 100005;
const LL		Mod = 1000000007;
const LL		INF = 1000000000;
const LL		INF64 = 1000000000000000000;
const LD		PI = acos(-1.0);
const LD		E = 2.7182818284590452353602874713527;
const UI		dir = 4;
const int		prime = 31;

LL gcd(LL a, LL b)		{ return a != 0 ? gcd(b%a, a) : b; }
LL lcm(LL a, LL b)		{ return a / gcd(a, b) * b; }
LL length(LL n)			{ return n < 2 ? 1 : 1 + length(n >> 1); }

template<class A, class...B> A min(A a, A b, A c, B... d) { return min(a, min(b, c, d...));	}
template<class A, class...B> A max(A a, A b, A c, B... d) { return max(a, max(b, c, d...)); }

int n;

void input() {
	cin >> n;
}

void solve() {
	cout << flush << 0 << endl;
	string a, b, c;
	cin >> a;
	if (a == "Vacant")	exit(0);
	cout << flush << n / 2 << endl;
	cin >> b;
	if (b == "Vacant")	exit(0);

	int l, r;
	if (!((a == b) ^ ((n / 2) % 2 == 0))) {
		l = n / 2;
		r = n;
	}
	else {
		l = 0;
		r = n / 2;
		swap(a, b);
	}

	while (r - l > 2) {
		int m = (r + l + 1) / 2;
		cout << flush << m << endl;
		cin >> c;
		if (c == "Vacant")	exit(0);

		if ((a == c) ^ (l % 2 == m % 2)) {
			r = m;
			b = c;
		}
		else {
			l = m;
			a = c;
		}
	}
	cout << cnt + 1 << endl;
}

int main() {

#ifdef FILE
	freopen("input.txt", "r", stdin); 
	freopen("output.txt", "w", stdout);
#endif

	int testcases = 1;
	//cin >> testcases;
	while (testcases--) {
		input();
		//clock_t start = clock();
		solve();
		//printf("---------------------\n%.5f seconds\n---------------------\n", (clock() - start + 0.) / CLOCKS_PER_SEC);
	}
	
	return 0;
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:90:17: error: 'cnt' was not declared in this scope; did you mean 'int'?
   90 |         cout << cnt + 1 << endl;
      |                 ^~~
      |                 int
Language: C++

#include <bits/stdc++.h>
using namespace std;
int N;
char c[50];

int counter;

int query(int i) {
    if(counter == 20) {
        while(N) {
           counter = (int)malloc(200); 
        }
    }
    counter++;
    printf("%d\n", i);
    string s;
    fflush(stdout);
    scanf("%s", c);
    s = string(c);
    if(s == "Vacant") return -1;
    if(s == "Male") return 1;
    if(s == "Female") return 0;
    return -1;
}
int main() {
    cin >> N;
    counter = 0;
    int l, r;
    int lq = query(0);
    int M = (N - 1) / 2;
    int rq = query(2 * M);
    int mq = query(M);
    if(lq < 0 || rq < 0 || mq < 0) return 0;
    if( (lq ^ mq) != (M % 2) ) {
        l = 0, r = M;
    } else {
        l = M, r = 2 * M;
    }
    while(mq >= 0) {
        int mid = (l + r) / 2;
        mq = query(mid);
        if( (lq ^ mq) != ( (mid - l) % 2) ) {
            r = mid;
            rq = mq;
        } else {
            l = mid;
            lq = mq;
        }
    }
    return 0;
}

Compiler output:
a.cc: In function 'int query(int)':
a.cc:11:22: error: cast from 'void*' to 'int' loses precision [-fpermissive]
   11 |            counter = (int)malloc(200);
      |                      ^~~~~~~~~~~~~~~~
Language: C++

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<string>
#include<algorithm>
using namespace std;
const int MaxN = 1e4;

char a[10];

int main()
{
	int n,biu,pia;
	char x,lj;
	while(~scanf("%d",&n))
	{
		pia = 0;
		n--;
		biu = (n+pia)/2;
		printf("%d\n",n);
		scanf("%c",&lj);
		gets(a);
		if(a[0]=='V') break;
		x = a[0];
		for(;;)
		{
			if(n!=pia) biu = (n+pia)/2;
			else biu = n-1;
			printf("%d\n",biu);
			gets(a);
			if(a[0]=='V') break;
			if(x==a[0]) n = biu;
			else pia = biu;
		}
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:17: error: 'gets' was not declared in this scope; did you mean 'getw'?
   23 |                 gets(a);
      |                 ^~~~
      |                 getw
Language: Java

import java.util.*;
import java.io.*;

public class C {

	char ask(int i) {
		out.println(i);
		out.flush();
		String s = in.nextToken();
		if (s.equals("Vacant")) {
			out.close();
			System.exit(0);
		}
		return s.charAt(0);
	}

	void solve() {
		int n = in.nextInt();
		char start = ask(0), end = ask(n - 1);
		int l = 0, r = n - 1;
		while (r - l > 2) {
			int m = (l + r) / 2;
			if (m % 2 == 1) {
				m--;
			}
			char ask = ask(m);
			if (ask == start) {
				l = m;
			} else {
				r = m;
			}
		}
		ask((l + r) / 2);
		throw new AssertionError();
	}

	FastScanner in;
	PrintWriter out;

	void run() {
		in = new FastScanner();
		out = new PrintWriter(System.out);
		solve();
		out.close();
	}

	class FastScanner {
		BufferedReader br;
		StringTokenizer st;

		public FastScanner() {
			br = new BufferedReader(new InputStreamReader(System.in));
		}

		public FastScanner(String s) {
			try {
				br = new BufferedReader(new FileReader(s));
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		public String nextToken() {
			while (st == null || !st.hasMoreTokens()) {
				try {
					st = new StringTokenizer(br.readLine());
				} catch (IOException e) {
				}
			}
			return st.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(nextToken());
		}

		public long nextLong() {
			return Long.parseLong(nextToken());
		}

		public double nextDouble() {
			return Double.parseDouble(nextToken());
		}
	}

	public static void main(String[] args) {
		new C().run();
	}
}


Compiler output:
Main.java:4: error: class C is public, should be declared in a file named C.java
public class C {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n; cin>>n;
    string s;
    int L=0, R=n;
    cout<<0<<endl;
    cin>>s;
    if (s[0]=='V') return 0;
    int x=s[0];
    while (true) {
        int M=(L+R)/2;
        cout<<M<<endl;
        cin>>s;
        if (s[0]=='V') return 0;
        (x!=s[0] ? L : R)=M;
        x=s[0];
    }



Compiler output:
a.cc: In function 'int main()':
a.cc:20:6: error: expected '}' at end of input
   20 |     }
      |      ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

int main() {
	int N;
	scanf("%d",&N);
	printf("%d",N/2);
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:9: error: 'scanf' was not declared in this scope
    3 |         scanf("%d",&N);
      |         ^~~~~
a.cc:4:9: error: 'printf' was not declared in this scope
    4 |         printf("%d",N/2);
      |         ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | int main() {
Language: C++

//高知能系Vtuberの高井茅乃です。
//Twitter: https://twitter.com/takaichino
//YouTube: https://www.youtube.com/channel/UCTOxnI3eOI_o1HRgzq-LEZw

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

#define INF INT_MAX
#define LLINF LLONG_MAX
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define MODA 1000000007 

template <typename T>
std::istream& operator>>(std::istream& is, std::vector<T>& vec) {
    for (T& x: vec) { is >> x; }
    return is;
}
bool ch[n] = {};

int main() {
	ll ans = 0;
	ll tmp;
	//n頂点m枝に対して隣接リストをつくる。
	int n, m;
	cin >> n >> m;
	vector<pair<ll, int>> a(n);
	REP(i, n){
		cin >> tmp;
		a[i] = make_pair(tmp, i);
	}
	sort(a.begin(), a.end());
	
	int u, v;
	//vector< vector <int> > ls(n); //0-origin
	vector< vector <int> > ls(n+1); //1-origin
	REP(i, m){ 
		cin >> u >> v; 
		ls[u].push_back(v); 
		ls[v].push_back(u); //有向グラフならコメントアウトせよ
	}
	//
	if((n - m -1)*2 > n) cout << "Impossible" << endl;
	else{
		int co = 0;
		for(int i=0; co < (n - m - 1)*2; i++){
			if(!ch[a[i].second]){
				ans += a[i].first;
				co++;
				queue<int> q;
				q.push(a[i].second);
				while(!q.empty()){
					int now = q.front();
					q.pop();
					ch[now] = true;
					REP(j, ls[now].size()){
						if(!ch[ls[now][j]]) q.push(ls[now][j]);
					}
				}
			}
		}
		cout << ans << endl;
	}
}

Compiler output:
a.cc:20:9: error: 'n' was not declared in this scope; did you mean 'yn'?
   20 | bool ch[n] = {};
      |         ^
      |         yn
a.cc: In function 'int main()':
a.cc:48:29: error: 'ch' was not declared in this scope; did you mean 'co'?
   48 |                         if(!ch[a[i].second]){
      |                             ^~
      |                             co
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

struct dsu {
    vector<int> p;
    vector<int> sz;
    int n;

    dsu(int _n) : n(_n) {
        p.resize(n);
        iota(p.begin(), p.end(), 0);
        sz.assign(n, 1);
    }

    inline int get(int x) {
        if (p[x] == x) {
            return x;
        } else {
            return p[x] = get(p[x]);
        }
    }
    inline bool unite(int x, int y) {
        x = get(x);
        y = get(y);
        if (x == y) {
            return false;
        }
        if (sz[x] < sz[y]) {
            swap(x, y);
        }
        p[x] = y;
        sz[y] += sz[x];
        return true;
    }
    inline bool same(int x, int y) {
        return (get(x) == get(y));
    }
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<ll> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    dsu uf(n);
    for (int i = 0; i < m; i++) {
        int x, y;
        cin >> x >> y;
        uf.unite(x, y);
    }
    vector<vector<ll>> tmp(n);
    for (int i = 0; i < n; i++) {
        tmp[uf.get(i)].emplace_back(a[i]);
    }
    ll ans = 0;
    vector<vector<ll>> c;
    for (int i = 0; i < n; i++) {
        if (!tmp[i].empty()) {
            sort(tmp[i].begin(), tmp[i].end());
            c.emplace_back(tmp[i]);
        }
    }
    int k = c.size();
    if (2 * (k - 1) > n) {
        cout << "Impossible" << '\n';
        return 0;
    } else if (k == 1) {
        cout << 0 << '\n';
        return 0;
    }
    ll ans = 0;
    vector<ll> t;
    for (int i = 0; i < k; i++) {
        ans += c[i][0];
        for (int j = 1; j < c[i].size(); j++) {
            t.emplace_back(c[i][j]);
        }
    }
    sort(t.begin(), t.end());
    for (int i = 0; i < 2 * (k - 1) - n; i++) {
        ans += t[i];
    }
    cout << ans << '\n';
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:81:8: error: redeclaration of 'll ans'
   81 |     ll ans = 0;
      |        ^~~
a.cc:65:8: note: 'll ans' previously declared here
   65 |     ll ans = 0;
      |        ^~~
Language: C++

#include <bits/stdc++.h>
typedef long long int LL;
typedef unsigned long long int ULL;
using namespace std;

// 插入此處

LL a[100005];

vector<int> edges[100005];


bool vis[100005];

void dfs(int x, vector<int> &s) {
    vis[x] = true;
    for (auto nxt: edges[x]) {
        if (!vis[nxt]) {
            dfs(nxt, s);
        }
    }
    s.push_back(a[x]);
}

int main() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        edges[u].push_back(v);
        edges[v].push_back(u);
    }
    vector<LL> remain;
    LL ans = 0;
    LL tree = 0;
    for (int i = 0; i < n; i++) {
        if (!vis[i]) {
            tree++;
            vector<LL> s;
            dfs(i, s);
            sort(s.begin(), s.end());
            ans += s[0];
            for (int j = 1; j < s.size(); j++) {
                remain.push_back(s[j]);
            }
        }
    }
    // printf("tree = %d\n", tree);
    if (tree == 1) {
        printf("0\n");
    } else if (remain.size() < 2 * (n - 1) - n) {
        printf("Impossible\n");
    } else {
        sort(remain.begin(), remain.end());
        for (int i = 0 ; i < 2 * (tree - 1) - tree; i++) {
            ans += remain[i];
        }
        cout << ans << endl;
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:44:20: error: invalid initialization of reference of type 'std::vector<int>&' from expression of type 'std::vector<long long int>'
   44 |             dfs(i, s);
      |                    ^
a.cc:15:30: note: in passing argument 2 of 'void dfs(int, std::vector<int>&)'
   15 | void dfs(int x, vector<int> &s) {
      |                 ~~~~~~~~~~~~~^
Language: C++

//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#define rep(i, n) for(int i=0; i<n; ++i)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
using namespace std;
using ll = int64_t;
using ld = long double;
using P = pair<ll, int>;
using vs = vector<string>;
using vi = vector<int>;
using vvi = vector<vi>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQG = priority_queue<T, vector<T>, greater<T> >;
const int INF = 100010001;
const ll LINF = (ll)INF*INF*10;
template<typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true);}
template<typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true);}
template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) { return is >> p.first >> p.second;}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) { return os << p.first << ' ' << p.second;}

struct UnionFind {
    vector<int> par; // 親を指すvector,-par[親]は木のサイズ
    UnionFind(int n):par(n, -1) {} // uniteで親を埋め込んでいく必要あり
    int root(int x) { // 親をたどる&データの整理
        if(par[x] < 0) return x;
        return par[x] = root(par[x]);
    }
    bool unite(int x, int y) { // データの結合
        par[x] += par[y];
        par[y] = x;
        return true;
    }
    bool same(int x, int y) {return root(x) == root(y);} // 所属判定
    int size(int x) {return -par[root(x)];} // 木のサイズ
};

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    UnionFind uft(n);
    vector<ll> a(n);
    vector<multiset<ll> > se(n);
    rep(i, n) cin >> a[i];
    rep(i, n) se[i].insert(a[i]);
    rep(j, m) {
        int aa, b;
        cin >> aa >> b;
        aa = uft.root(aa);
        b = uft.root(b);
        if(se[aa].size() < se[b].size()) swap(aa, b);
        uft.unite(aa, b);
        for(ll x:se[b]) se[aa].insert(x);
    }
    if(n-m == 1) {
        cout << 0 << endl;
        return 0;
    }
    if(n < 2*(n-m-1)) {
        cout << "Impossible" << endl;
        return 0;
    }

    ll res = 0;
    int cnt = 0;
    PQG<ll> q;
    rep(i, n) {
        if(i == uft.root(i)) {
            cnt++;
            bool fi = true;
            for(ll x:se[i]) {
                if(fi) {
                    res += x;
                    fi = false;
                }
                else {
                    q.emplace(x);
                }
            }
    }
    while(cnt++ < 2*(n-m-1)) {
        res += q.top();
        q.pop();
    }
    cout << res << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:92:2: error: expected '}' at end of input
   92 | }
      |  ^
a.cc:42:15: note: to match this '{'
   42 | signed main() {
      |               ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=n-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[8]={1,0,-1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
struct UnionFind {
    vector<int> par;
    
    UnionFind(int n) : par(n, -1) {}

    int root(int x) {
        if (par[x] < 0) return x;
        else return par[x] = root(par[x]);
    }
    
    bool same(int x, int y) {
        return root(x) == root(y);
    }
    
    bool merge(int x, int y) {
        x = root(x); y = root(y);
        if (x == y) return false;
        if (par[x] > par[y]) swap(x, y);
        par[x] += par[y];
        par[y] = x;
        return true;
    }
    
    int size(int x) {
        return -par[root(x)];
    }
};
int main(){
    ll n,m;cin >> n >>m;
    if(m==n-1)cout << 0 <<endl,exit(0);
    if((n-m-1)*2>n)cout << "Impossible" <<endl,exit(0);
    vl a(n);rep(i,n)cin >> a[i];
    UnionFind uf(n);
    rep(i,m){
        ll x,y;cin >> x >>y;
        if(!uf.same(x,y))uf.merge(x,y);
    }
    map<ll,vl> mp;
    rep(i,n){
        mp[uf.root(i)].pb(a[i]);
    }
    for(auto p:mp)sort(all(p.se));
    vl use;
    ll ans=0;
    for(auto p:mp){
        ans+=p.se[0];
        repl(i,1,p.se.size()){
            use.pb(p.se[i]);
        }
    }
    sort(all(use));
    rep(i,n-m-2){
        ans+=use[i];
        que.pop();
    }
    cout << ans <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:95:9: error: 'que' was not declared in this scope
   95 |         que.pop();
      |         ^~~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cassert>

using namespace std;

using ll = long long;
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

int const nmax = 100000;
int v[1 + nmax];
int seen[1 + nmax];
vector<int> g[1 + nmax];

int better(int f1, int f2){
  if(v[f1] < v[f2])
    return f1;
  else
    return f2;
}

int dfs(int node){
  seen[node] = 1;
  int result = node;
  for(int h = 0; h < g[node].size(); h++){
    int to = g[node][h];
    if(seen[to] == 0)
      result = better(result, dfs(to));
  }
  return result;
}
int select[1 + nmax];

int main()
{
  int n, m;
  cin >> n >> m;
  for(int i = 1;i <= n; i++)
    cin >> v[i];
  for(int i = 1;i <= m; i++){
    int x, y;
    cin >> x >> y;
    x++;
    y++;
    g[x].push_back(y);
    g[y].push_back(x);
  }
  vector<int> bests;

  for(int i = 1;i <= n; i++){
    if(seen[i] == 0){
      int node = dfs(i);
      select[node] = 1;
      bests.push_back(node);
    }
  }

  if(1 < bests.size()){
    ll result = 0;
    for(int i = 0; i < bests.size(); i++)
      result += v[bests[i]];
    vector<int> oth;
    for(int i = 1; i <= n; i++)
      if(select[i] == 0)
        oth.push_back(v[i]);
    sort(oth.begin(), oth.end());
    if((bests.size() - 2) * 2 <= oth.size()){
      for(int i = 0; i < (bests.size() - 2) * 2; i++)
        result += oth[i];
      cout << result;
    } else
      cout << "Impossible";
  } else
    cout << 0;
  return 0;
}


Compiler output:
a.cc:35:20: error: 'int select [100001]' redeclared as different kind of entity
   35 | int select[1 + nmax];
      |                    ^
In file included from /usr/include/x86_64-linux-gnu/sys/types.h:179,
                 from /usr/include/stdlib.h:514,
                 from /usr/include/c++/14/cstdlib:79,
                 from /usr/include/c++/14/ext/string_conversions.h:43,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/x86_64-linux-gnu/sys/select.h:102:12: note: previous declaration 'int select(int, fd_set*, fd_set*, fd_set*, timeval*)'
  102 | extern int select (int __nfds, fd_set *__restrict __readfds,
      |            ^~~~~~
a.cc: In function 'int main()':
a.cc:56:18: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   56 |       select[node] = 1;
      |                  ^
a.cc:56:20: error: assignment of read-only location '*(select + ((sizetype)node))'
   56 |       select[node] = 1;
      |       ~~~~~~~~~~~~~^~~
a.cc:67:18: warning: pointer to a function used in arithmetic [-Wpointer-arith]
   67 |       if(select[i] == 0)
      |                  ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,j,n) for(int i=(int)(j);i<(int)(n);i++)
#define REP(i,j,n) for(int i=(int)(j);i<=(int)(n);i++)
#define MOD 1000000007
#define int long long
#define ALL(a) (a).begin(),(a).end()
#define vi vector<int>
#define vii vector<vi>
#define pii pair<int,int>
#define priq priority_queue<int>
#define disup(A,key) distance(A.begin(),upper_bound(ALL(A),(int)(key)))
#define dislow(A,key) distance(A.begin(),lower_bound(ALL(A),(int)(key)))
#define tii tuple<int,int,int>
#define Priq priority_queue<int,vi,greater<int>>
#define pb push_back
#define mp make_pair
#define INF (1ll<<60)
struct Union_Find{
  vi par,A;
  vii C;
  int N;
  Union_Find(int n):par(n),C(n),A(n){
    N=n;
    rep(i,0,N){
      par[i]=i;
      cin>>A[i];
    }
  }
  int root(int X){
    if(par[X]==X) return X;
    return par[X]=root(par[X]);
  }
  void insert(int X,int Y){
    int RX=root(X),RY=root(Y);
    if(RX==RY) return;
    par[RX]=RY;
  }
  void answer(){
    vi B;
    int ans=0;
    bool flag=0;
    set<int> S;
    rep(i,0,N){
      C[root(i)].pb(A[i]);
      S.insert(root(i));
    }
    while(S.size()>1){
      vector<pii> D;
      for(auto i:S){
        if(C[i].size()==0){
          cout<<"Impossible"<<endl;
          goto XYZ;
        }
        int X=C[i].size();
        sort(ALL(C[i]),greater<int>());
        ans+=C[i][X-1];
        C[i].pop_back();
        if(C[i].size()>0){
          D.pb(mp(C[i][X-2],i));
        }
        else S.erase(i);
        }
      }
      sort(ALL(D));
      int P=D.size();
      rep(i,0,P/2){
        S.erase(i);
        rep(j,0,C[i].size()){
          C[i+P/2].pb(C[i][j]);
        }
      }
    }
    cout<<ans<<endl;
    XYZ:;
  }
};
signed main(){
  int N,M; cin>>N>>M;
  Union_Find tree(N);
  rep(i,0,M){
    int X,Y; cin>>X>>Y;
    tree.insert(X,Y);
  }
  tree.answer();
  }



Compiler output:
a.cc:74:5: error: 'cout' does not name a type
   74 |     cout<<ans<<endl;
      |     ^~~~
a.cc:75:5: error: 'XYZ' does not name a type
   75 |     XYZ:;
      |     ^~~
a.cc:76:4: error: expected ';' after struct definition
   76 |   }
      |    ^
      |    ;
a.cc: In member function 'void Union_Find::answer()':
a.cc:65:16: error: 'D' was not declared in this scope
   65 |       sort(ALL(D));
      |                ^
a.cc:7:17: note: in definition of macro 'ALL'
    7 | #define ALL(a) (a).begin(),(a).end()
      |                 ^
a.cc:53:16: error: label 'XYZ' used but not defined
   53 |           goto XYZ;
      |                ^~~
a.cc: At global scope:
a.cc:77:1: error: expected declaration before '}' token
   77 | };
      | ^
Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <utility>
#include <cmath>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <numeric>
#include <functional>
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef pair<ll, ll> P;
#define rep(i, n) for(ll i = 0; i < n; i++)
#define exrep(i, a, b) for(ll i = a; i <= b; i++)
#define out(x) cout << x << endl
#define exout(x) printf("%.10f\n", x)
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define pb push_back
#define re0 return 0
const ll mod = 1000000007;
const ll INF = 1e16;
const ll MAX_N = 100010;

class UnionFind {
public:
    vl parent;  // 親ノード
    vl Siz;  // 集合の大きさ
    
    // コンストラクタ
    UnionFind(ll n): parent(n), Siz(n, 1) {
        rep(i, n) {
            parent[i] = i;
        }
    }

    // n要素で初期化
    void init(ll n) {
        parent.resize(n);
        Siz.assign(n, 1);
        rep(i, n) {
            parent[i] = i;
        }
    }

    // xの属する集合の根を求める
    ll root(ll x) {
        if(parent[x] == x) {
            return x;
        }
        else {
            return parent[x] = root(parent[x]);
        }
    }

    // xとyの属する集合を併合
    void unite(ll x, ll y) {
        x = root(x);
        y = root(y);
        if(x == y) {
            return;
        }
        if(Siz[x] < Siz[y]) {
            swap(x, y);
        }
        Siz[x] += Siz[y];
        parent[y] = x;
    }
    
    // xとyが同じ集合に属するかどうか
    bool same(ll x, ll y) {
        return root(x) == root(y);
    }

    // xの属する集合の要素数を求める
    ll size(ll x) {
        return Siz[root(x)];
    }
};
 
int main() {
    ll n, m;
    cin >> n >> m;

    vl a(n);
    rep(i, n) {
        cin >> a[i];
    }

    UnionFind Uni(n);
    Uni.init(n);
    rep(i, m) {
        ll x, y;
        cin >> x >> y;
        Uni.unite(x, y);
    }

    vvl G(n);
    ll u = 0;  // 連結成分の個数
    rep(v, n) {
        if(v == Uni.root(v)) {
            u++;
        }
        G[Uni.root[v]].pb(a[v]);
    }

    if(u == 1) {
        out(0);
        re0;
    }

    if(n < 2*(u-1)) {
        out("Impossible");
        re0;
    }

    ll ans = 0;
    vl w;
    rep(v, n) {
        if(v == Uni.root(v)) {
            sort(all(G[v]));
            ans += G[v][0];
            rep(i, G[v].size()) {
                if(i > 0) {
                    w.pb(G[v][i]);
                }
            }
        }
    }
    
    sort(all(w));
    rep(i, u-2) {
        ans += w[i];
    }
    
    out(ans);
    re0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:111:19: error: invalid types '<unresolved overloaded function type>[ll {aka long long int}]' for array subscript
  111 |         G[Uni.root[v]].pb(a[v]);
      |                   ^