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

#include<bits/stdc++.h>
#define MAXN 1000000+10 
using namespace std;
int n,m,I,P,Q;
int tot,head[MAXN],to[MAXN],nxt[MAXN],linker[MAXN];
bool f,vis[MAXN];
void add(int x,int y){
	cnt++;
	to[cnt]=y;
	nxt[cnt]=head[x];
	head[x]=cnt;
}
void dfs(int x,int fa){
	vis[x]=true;
	linker[x]=linker[fa]^1;
	for(int i=head[x];i;i=nxt[i]){
		int y=to[i];
		if(y!=fa){
			if(vis[y])
				if(linker[x]==linker[y])f=true;
			else dfs(y,x);
		}
	}
}
int main(){
	scanf("%d%d",&n,&m);
	int x,y;
	for(int i=0;i<m;i++){
		cin>>x>>y;
		add(x,y);
		add(y,x);
	}
	for(int i=1;i<=n;i++)
		if(!vis[i]){
			if(!head[i]){
				I++;
				vis[i]=true;
				continue;
			}
			f=false;
			dfs(i,0);
			if(f)P++;
			else Q++;
		}
	long long ans=2LL*I*n-1LL*I*I+1LL*P*P+2LL*P*Q+2LL*Q*Q;
	printf("%lld\n",ans);
    return 0;
}

Compiler output:
a.cc: In function 'void add(int, int)':
a.cc:8:9: error: 'cnt' was not declared in this scope; did you mean 'int'?
    8 |         cnt++;
      |         ^~~
      |         int
Language: C

#include <stdio.h>

int dfs(int, int);

int N, M;
int edge[100010][100010];
int used[100010];

int main(void) {
	int i, tmp[2], single = 0, bipartite = 0, other = 0, ans = 0;
	
	scanf("%d%d", &N, &M);
	for (i = 0; i < M; i++) {
		scanf("%d%d", &tmp[0], &tmp[1]);
		edge[tmp[0]][tmp[1]] = 1;
		edge[tmp[1]][tmp[0]] = 1;
	}

	for (i = 1; i <= N; i++) {
		if (used[i] != 0) continue;

		switch (dfs(i, 1)) {
		case 1 :
			bipartite++;
			break;
		case 0 :
			other++;
			break;
		case -1:
			single++;
			break;
		}
	}

	ans += single * (N - single) * 2 + single * single;
	ans += other * bipartite * 2 + other * other;
	ans += bipartite * bipartite * 2;
	printf("%d\n", ans);

	return 0;
}

// 二部グラフなら1、辺がなければ-1、それ以外は0を返す
int dfs(int v, int sign) {
	int i, single_flag = 1, res = 1;

	used[v] = sign;
	for (i = 1; i <= N; i++) {
		if (edge[v][i] == 1) {
			if (used[i] == sign)
				res = 0;
			else if (used[i] == 0)
				res = dfs(i, -sign);
			single_flag = 0;
		}
	}

	if (single_flag)
		return -1;
	else
		return res;
}

Compiler output:
/tmp/ccFkCKXz.o: in function `main':
main.c:(.text+0xfa): relocation truncated to fit: R_X86_64_PC32 against symbol `used' defined in .bss section in /tmp/ccFkCKXz.o
/tmp/ccFkCKXz.o: in function `dfs':
main.c:(.text+0x1d2): relocation truncated to fit: R_X86_64_PC32 against symbol `used' defined in .bss section in /tmp/ccFkCKXz.o
main.c:(.text+0x224): relocation truncated to fit: R_X86_64_PC32 against symbol `used' defined in .bss section in /tmp/ccFkCKXz.o
main.c:(.text+0x249): relocation truncated to fit: R_X86_64_PC32 against symbol `used' defined in .bss section in /tmp/ccFkCKXz.o
collect2: error: ld returned 1 exit status
Language: C++

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

namespace {
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define len(x) (int)((x).size())
#define X first
#define Y second

#define FOR(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))

#ifndef ONLINE_JUDGE
#include "debug.h"
#else
#define DEBUG(...) 
#define DEBUG_2D(...)
#endif  // ONLINE_JUDGE
  
typedef long long int ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
template<typename T> using minpq = priority_queue<T, vector<T>, greater<T>>;

ll expmod(ll a,ll b,ll mod) {ll res=1;a%=mod;for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
template<typename T> T sqr(const T& x) { return x*x; }
ll flog(const ll x) { return 63 - __builtin_clzll(x); }
template<typename T> void sort(T& t) { sort(all(t)); }
template<typename T> void undupe(vector<T>& v) { sort(v); v.erase(unique(all(v)), v.end()); }

struct _IOS { _IOS() { ios::sync_with_stdio(0); cin.tie(0); } } _IOS;
}

const ll MOD = 1e9 + 9;
const ll INF = 1e15;
const double EPS = 1e-8;

int N, M;
vvi adj;

vi vis;
vi col;
vi deg;
ll comp = 0, good = 0, bad = 0, wt = 0, bk = 0;
bool ok = true;

void dfs(int u, int c) {
  vis[u] = 1;
  col[u] = c;
  if (c) wt++;
  else bk++;
  for (int v : adj[u]) {
    if (col[v] == c) ok = false;
    if (!vis[v]) dfs(v, c^1);
  }
}

int main() {
  cin >> N >> M;
  adj.resize(N);
  deg.resize(N);
	FOR(i,0,M) {
    int u, v; cin >> u >> v; u--, v--;
    adj[u].push_back(v);
    adj[v].push_back(u);
    deg[u]++, deg[v]++;
  }
  
  ll A = 0;
  
  FOR(i,0,N) {
    if (deg[i] == 0) {
      A++;
    }
  }
	
  vis.assign(N, 0);
  col.assign(N, -1);
  
	FOR(u,0,N) if (!vis[u] && !(deg[u] == 0)) {
    comp++;
    ok = true;
    wt = 0, bk = 0;
    dfs(u, 0);
    if (ok) good++;
    else bad++;
  }
  
  ll ans = (bad*(bad + 2*good)) + (2*good*good) + (2*N*A - A*A);
  cout << ans << "\n";
}


Compiler output:
a.cc:14:10: fatal error: debug.h: No such file or directory
   14 | #include "debug.h"
      |          ^~~~~~~~~
compilation terminated.
Language: C

#include <cstdio>
#include <list>

std::list<int> G[100000];
int mark[100000];

std::list<int> cs;
int iso;

int dfs(int i, int c, int b){
  for(int j : G[i]){
    if(mark[j]&&mark[j]!=-c) b = 0;
    if(!mark[j]){
      mark[j]=-c;
      b &= dfs(j, -c, b);
    }
  }
  return b;
}

int dfs0(int i, int c, int b){
  iso=1;
  for(int j : G[i]){
    if(mark[j]&&mark[j]!=-c) b = 0;
    if(!mark[j]){
      mark[j]=-c;
      b &= dfs(j, -c, b);
      iso=0;
    }
  }
  return b;
}

long long int c(int n){
  int ans=0;
  int ans2=0;
  int ans0=0;
  while(1){
    int i, j;
    for(i=0;i<n;i++){
      if(!mark[i]) break;
    }
    if(i==n){
      ans-=ans2;
      return (long long) ans*ans+(long long) ans2*ans2 + (ans0 ? (long long)(2*n-iso)*iso : 0);
    }
    mark[i] = 1;
    ans++;
    j=dfs0(i, 1, 1);
    ans2+=j&~iso;
    ans0+=iso;
  }

}
int main(){                                                                                                                                                                                                                  
  int i, n, m;
  std::scanf("%d%d", &n, &m);

  for(i=0;i<m;i++){
    int a, b;
    std::scanf("%d%d", &a,&b);
    G[a-1].push_back(b-1);
    G[b-1].push_back(a-1);
  }

  printf("%lld\n", c(n));
  return 0;
}


Compiler output:
main.c:1:10: fatal error: cstdio: No such file or directory
    1 | #include <cstdio>
      |          ^~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
    #define debug(...) printf(__VA_ARGS__)
#else
    #define debug(...) (void)0
#endif
#define MP make_pair
#define PB push_back
#define LL long long
#define pii pair<int,int>

#define F first
#define S second
#define ALL(x) (x).begin(),(x).end()
#define SZ(x) ((int)(x).size())
//const int inf = 0x7fffffff; //beware overflow
//const LL INF = 0x7fffffffffffffff; //beware overflow
#define mem(x, y) memset(x, (y), sizeof(x) );
#define IOS ios_base::sync_with_stdio(0); cin.tie(0)
template<typename A, typename B>
ostream& operator <<(ostream &s, const pair<A,B> &p) {
     return s<<"("<<p.first<<","<<p.second<<")";
}
template<typename T>
ostream& operator <<(ostream &s, const vector<T> &c) {
    s << "[ ";
    for (auto it : c) s << it << " ";
    s << "]";
    return s;
}
template<typename T>
ostream& operator << (ostream &o, const set<T> &st) {
    o << "{";
    for (auto it=st.begin(); it!=st.end(); it++) o << (it==st.begin() ? "" : ", ") << *it;
    return o << "}";
}
template<typename T1, typename T2>
ostream& operator << (ostream &o, const map<T1, T2> &mp) {
    o << "{";
    for (auto it=mp.begin(); it!=mp.end(); it++) {
        o << (it==mp.begin()?"":", ") << it->fi << ":" << it->se;
    }
    o << "}";
    return o;
}
inline LL getint(){
   LL _x=0,_tmp=1; char _tc=getchar();
   while( (_tc<'0'||_tc>'9')&&_tc!='-' ) _tc=getchar();
   if( _tc == '-' ) _tc=getchar() , _tmp = -1;
   while(_tc>='0'&&_tc<='9') _x*=10,_x+=(_tc-'0'),_tc=getchar();
   return _x*_tmp;
}
#define maxn 100005
vector<int> G[maxn];
bool vis[maxn];
int sz;
bool dfs(int u, int p=-1) {
    assert( !vis[u]);
    sz++;
    vis[u] = true;
    bool cycle=false;
    for(int v : G[u]) if(v!=p) {
        if( vis[v] ) cycle=true;
        else cycle |= dfs(v, u);
    }
    return cycle;
}
int main() {
    int n=getint(), m=getint();
    for(int i=0;i<m;i++) {
        int x, y; scanf("%d %d", &x, &y);
        x--, y--;
        G[x].PB(y), G[y].PB(x);
    }
    vector<int> v;
    vector<bool> cy;
    for(int i=0;i<n;i++)if(!vis[i]) {
        sz=0;
        cy.PB( dfs(i) );
        v.PB(sz);
    }

    LL cyc=0, nocyc=0, cnt1=0;
    for(int i=0;i<SZ(cy);i++) {
        if( v[i]==1 ) cnt1++;
        else {
            if(cy[i])cyc++;
            else nocyc++;
        }
    }
    assert( cnt+cnt1==SZ(v));
    LL cnt=cyc+nocyc;
    LL cc = n-cnt1;
    LL ans = cyc+2*nocyc+2*( nocyc*(nocyc-1) + cnt*(cnt-1)/2 - nocyc*(nocyc-1)/2 ) + cnt1*cnt1+2*cc*cnt1;
    cout << ans << endl;
}


Compiler output:
In file included from /usr/include/c++/14/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:106,
                 from a.cc:1:
a.cc: In function 'int main()':
a.cc:92:13: error: 'cnt' was not declared in this scope; did you mean 'cnt1'?
   92 |     assert( cnt+cnt1==SZ(v));
      |             ^~~
Language: C++

#include <iostream>
#include <iomanip>
#include <stdio.h>
#include <set>
#include <vector>
#include <map>
#include <cmath>
#include <algorithm>
#include <memory.h>
#include <string>
#include <sstream>
#include <cstdlib>
#include <ctime>
#include <cassert>

using namespace std;

typedef long long LL;
typedef pair<int,int> PII;

#define MP make_pair
#define PB push_back
#define FF first
#define SS second

#define FORN(i, n) for (int i = 0; i <  (int)(n); i++)
#define FOR1(i, n) for (int i = 1; i <= (int)(n); i++)
#define FORD(i, n) for (int i = (int)(n) - 1; i >= 0; i--)

#define DEBUG(X) { cout << #X << " = " << (X) << endl; }
#define PR0(A,n) { cout << #A << " = "; FORN(_,n) cout << A[_] << ' '; cout << endl; }

#define MOD 1000000007
#define INF 2000000000

int GLL(LL& x) {
    return scanf("%lld", &x);
}

int GI(int& x) {
    return scanf("%d", &x);
}

const int MAXN = 100005;
int color[MAXN];

int n, m, cs; bool bip;

vector< vector<int> > adj;

void dfs(int u) {
    for (auto& v : adj[u]) {
        if (color[v] != 0) {
            if (color[u] == color[v]) bip = false;
        }
        else {
            color[v] = 3 - color[u]; cs++;
            dfs(v);
        }
    }
}

int main() {
    memset(color, 0, sizeof color);

    GI(n);
    GI(m);

    adj.resize(n+1);

    FOR1(i, m) {
        int u, v;
        GI(u); GI(v);
        adj[u].PB(v);
        adj[v].PB(u);
    }

    LL odd = 0, noOdd = 0, single = 0;

    FOR1(i, n) {
        if (color[i] == 0) {
            color[i] = 1; cs = 1; bip = true;

            dfs(i);

//            DEBUG(i); DEBUG(bip);

            if (cs == 1) {
                single++;
            }
            else if (bip) {
                noOdd++;
            }
            else {
                odd++;
            }
        }
    }

    //DEBUG(single);
    //DEBUG(noOdd);
    //DEBUG(odd);

    cout << 2 * single * (n - single) + single * single + 2 * odd * noOdd + odd * odd + 2 * noOdd * noOdd << endl;
 
    return 0;
}
bee

Compiler output:
a.cc:108:1: error: 'bee' does not name a type
  108 | bee
      | ^~~
Language: C++

#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define pb push_back
using namespace std;
using ll = long long;
//using arr = array;
using pi = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vpi = vector<pi>;
using ld = long double;
const int maxn = 1<<18, mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n, k;
string s;
void go() {//naive
	int i = 0, v = 1;
	while(i>=0&&i<n) {
		if(s[i] == 'A') v=-v;
		s[i] = s[i] == 'A' ? 'B' : 'A';
		i += v;
	}
	cout << (i<0?'L':'R') << " ";
}
string get(int n, int k, string s) {
	for(auto &i : s) i -= 'A';
	int l = 0, a = 0;
	for(int i = 0; i < k; i++) {
		if(s[l] == a) s[l] = !a;
		else {
			l = ++l == n ? 0 : l;
			a ^= 1;
			s[l ? l-1 : n-1] = a;
		}
	}
	r++;
	string res = "";
	while(true) {
		res += char('A' + (s[l++]^a));
		if(l == r) break;
		if(l == n) l = 0;
	}
	return res;
}
int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin >> n >> k >> s;
	cout << (get(n, k, s));
}


Compiler output:
a.cc: In function 'std::string get(int, int, std::string)':
a.cc:39:9: error: 'r' was not declared in this scope
   39 |         r++;
      |         ^
Language: C++

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

#define int long long
const int MAXN = 4 * 100 * 1000 + 1234;
int n, k;
string s;

char rev(char c) {
	return (c == 'A')? 'B': 'A';
}
string gen(int c) {
	string ss;
	if (c % 2 == 0)
		for (int i = 0; i <= n; i++)
			ss += s[i + c];
	else 
		for (int i = 0; i <= n; i++)
			ss += rev(s[i + c]);
	return ss;
}

string prv(string s) {
	if (s[0] == 'A') {
		s[0] = 'B';
		return s;
	}
	return s;
}

void out(string s) {
	if (s == "")
		return ;
	for (int i = 0; i < n; i++)
		putchar(s[i]);
	exit(0);
}

int main() {
	cin >> n >> k;
	cin >> s;
	int ans[MAXN];
	char ch[2] = {'B', 'A'};
	for (int i = 0; i <= 2 * n + 100; i++)
		s += ch[i % 2];
	ans[0] = (s[0] == ch[1]);
	for (int i = 1; i <= n + 10; i++) {
		ans[i] = ans[i - 1] + 1;
//		cerr << ans[i] << ' ' << s[i] << ' ' << ch[i & 1] << endl;
		ans[i] += s[i] == ch[i % 2 ^ 1];
	}
//	for (int i = 0; i <= n; i++)
//		cerr << i << ' ' << ans[i] << endl;
	for (int i = 0; i <= n + 10; i++) {
//		cerr << i << ' ' << gen(i) << endl;
		if (k == ans[i]) 
			out(prv(gen(i)));
		else if (k == ans[i] - 1)
			out(gen(i));
	}
//	cerr << "yoho " << ans[n] << endl;
	k -= ans[n + 1];
	k %= 2;
	if (k == 0 || n % 2 == 0)
		out(gen(n));
	else
		out(prv(gen(n)));
}


Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

// g++ -std=c++11 a.cpp
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>	
#include<map>
#include<set>
#include<unordered_map>
#include<utility>
#include<cmath>
#include<random>
#include<cstring>
#include<queue>
#include<stack>
#include<bitset>
#include<cstdio>
#include<sstream>
#include<iomanip>
#include<assert.h>
#include<typeinfo>
#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)
#define FOR(i,a) for(auto i:a)
#define pb push_back
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)
#define show1d(v) rep(_,v.size())cout<<" "<<v[_];cout<<endl;
#define show2d(v) rep(_,v.size()){rep(__,v[_].size())cout<<" "<<v[_][__];cout<<endl;}cout<<endl;
using namespace std;
//kaewasuretyuui
typedef long long ll;
//#define int ll
typedef ll Def;
typedef pair<Def,Def> pii;
typedef vector<Def> vi;
typedef vector<vi> vvi;
typedef vector<pii> vp;
typedef vector<vp> vvp;
typedef vector<string> vs;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef pair<Def,pii> pip;
typedef vector<pip>vip;
// #define mt make_tuple
// typedef tuple<int,int,int> tp;
// typedef vector<tp> vt;
template<typename A,typename B>bool cmin(A &a,const B &b){return a>b?(a=b,true):false;}
template<typename A,typename B>bool cmax(A &a,const B &b){return a<b?(a=b,true):false;}
//template<class C>constexpr int size(const C &c){return (int)c.size();}
//template<class T,size_t N> constexpr int size(const T (&xs)[N])noexcept{return (int)N;}
const double PI=acos(-1);
const double EPS=1e-9;
Def inf = sizeof(Def) == sizeof(long long) ? 1e18+10 : 1e9+10;
// int dx[]={0,1,0,-1,1,1,-1,-1};
// int dy[]={1,0,-1,0,1,-1,1,-1};//RDLU
int dx[]={-1,-1,0,0,1,1};
int dy[]={-1,0,-1,1,0,1};//RDLU
void solve(string s,int n,int m){
	int t=0;
	while(m&&t<s.size()){
		if('A'+t%2==s[t]){
			m--;
			if(s[t]=='A')s[t]++;
			else s[t]--;
			if(!m)break;
		}
		t++;m--;
	}
	string out=s.substr(t);
	if(t%2)rep(i,out.size())if(out[i]=='A')out[i]++;
	else out[i]--;
	while(out.size()!=n)out+=(char)('A'+(n+1-out.size())%2);
	if(t==n&&m%2)out[0]='B';
	cout<<out<<endl;
}
int main(){
	int n,m;
	cin>>n;
	string s;
	cin>>s;
	solve(s,n,i);
}







Compiler output:
a.cc: In function 'int main()':
a.cc:81:19: error: 'i' was not declared in this scope
   81 |         solve(s,n,i);
      |                   ^
Language: C++

#include<iostream>
#include<cstdio>
#include<string>
#include<cstring>
#include<vector>
#include<algorithm>
#include<queue>
#include<stack>
#define maxn 200050
#define maxint ~0U>>1

std::stack<int> sta;
std::vector<int> comp[maxn];
int incomp[maxn],instack[maxn],dfn[maxn],low[maxn];
int index,cnum;
int n,m,q,d[maxn],rice[maxn],noodle[maxn],v[maxn],s,p,ans,dis[maxn];
bool jud[maxn];
std::vector<int> g[maxn],nowg[maxn];
int nowrice[maxn],nownoodle[maxn],nows;
void input(){
    std::cin>>n>>m;
    int u,v;
    for(int i = 1;i <= m;i++){
        scanf("%d%d",&u,&v);
        g[u].push_back(v);
    }
}
void tarjan(int u){
    instack[u] = 2;
    dfn[u] = low[u] = ++index;
    sta.push(u);
    for(int i = 0;i < g[u].size();i++){
        int j = g[u][i];
        if(!dfn[j]){
            tarjan(j);
            low[u] = std::min(low[u],low[j]);
        }else if(instack[j] == 2){
            low[u] = std::min(low[u],dfn[j]);
        }
    }
    if(dfn[u] == low[u]){
        ++cnum;
        while(!sta.empty()){
            int t = sta.top();
            sta.pop();
            instack[t] = 1;
            incomp[t] = cnum;
            comp[cnum].push_back(t);
            if(t == u){
                break;
            }
        }
    }
}
void work(){
    for(int i = 1;i <= n;i++){
        if(!dfn[i]) tarjan(i);
    }
    int u,v,newu,newv;
    for(int i = 1;i <= n;i++){
        u = i;
        newu = incomp[u];
        nowrice[newu] += 1;
        for(int j = 0;j < g[u].size();j++){
            v = g[u][j];
            newv = incomp[v];
            if(newu == newv) continue;
            nowg[newu].push_back(newv);
        }
    }
}
void dfs(int x){
    if(nowg[x].size() == 0){
        dis[x] = nowrice[x];
        return;
    }
    for(int i = 0;i < nowg[x].size();i++){
        if(!dis[nowg[x][i]]) dfs(nowg[x][i]);
        dis[x] = std::max(dis[x],dis[nowg[x][i]] + nowrice[x]);
    }
    return;
}
void spfa(){
    memset(dis,0,sizeof(dis));
    for(int i = 1;i <= cnum;i++){
        if(!dis[i]) dfs(i);
    }

}
int main(){
    input();
    work();
    spfa();
    int ansnow = 0;
    for(int i = 1;i <= cnum;i++){
        ansnow = std::max(ansnow,dis[i]);
    }
    std::cout<<ansnow;
    return 0;
}


Compiler output:
a.cc:15:5: error: 'int index' redeclared as different kind of entity
   15 | int index,cnum;
      |     ^~~~~
In file included from /usr/include/string.h:462,
                 from /usr/include/c++/14/cstring:43,
                 from a.cc:4:
/usr/include/strings.h:50:20: note: previous declaration 'const char* index(const char*, int)'
   50 | extern const char *index (const char *__s, int __c)
      |                    ^~~~~
a.cc: In function 'void tarjan(int)':
a.cc:30:25: error: no pre-increment operator for type
   30 |     dfn[u] = low[u] = ++index;
      |                         ^~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int N=2e5+10;
bitset<N> S0,T0;
bitset<N-1> S1,T1;
int n,k;char s[N];
template<unsigned N>
void work(bitset<N> &S){
	if (S[0]) S^=~(S^(S>>1)),S[N-1]=0;else S[0]=1;
}
int main()
{
	scanf("%d%d%s",&n,&k,s);
	for (int i=N-2;i>=0;i-=2) T0[i]=S0[i]=1;
	for (int i=N-1;i>=0;i-=2) T1[i]=S1[i]=1;
	for (int i=0;i<n;i++)
		if (n&1) S1[i]=(s[i]=='B');else S0[i]=(s[i]=='B');
	while (k--){
		if (n&1){
			work(S1);
			if (S1==T1){k%=2;if (k&1) work(S1);break;}
		}
		else{
			work(S0);
			if (S0==T0){k%=2;if (k&1) work(S0);break;}
		}
	}
	for (int i=0;i<n;i++) putchar((n&1?S1[i]:S0[i])+'A');
	puts("");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:29: error: no matching function for call to 'work(std::bitset<200009>&)'
   20 |                         work(S1);
      |                         ~~~~^~~~
a.cc:8:6: note: candidate: 'template<unsigned int N> void work(std::bitset<N>&)'
    8 | void work(bitset<N> &S){
      |      ^~~~
a.cc:8:6: note:   template argument deduction/substitution failed:
a.cc:20:29: note:   mismatched types 'unsigned int' and 'long unsigned int'
   20 |                         work(S1);
      |                         ~~~~^~~~
a.cc:21:55: error: no matching function for call to 'work(std::bitset<200009>&)'
   21 |                         if (S1==T1){k%=2;if (k&1) work(S1);break;}
      |                                                   ~~~~^~~~
a.cc:8:6: note: candidate: 'template<unsigned int N> void work(std::bitset<N>&)'
    8 | void work(bitset<N> &S){
      |      ^~~~
a.cc:8:6: note:   template argument deduction/substitution failed:
a.cc:21:55: note:   mismatched types 'unsigned int' and 'long unsigned int'
   21 |                         if (S1==T1){k%=2;if (k&1) work(S1);break;}
      |                                                   ~~~~^~~~
a.cc:24:29: error: no matching function for call to 'work(std::bitset<200010>&)'
   24 |                         work(S0);
      |                         ~~~~^~~~
a.cc:8:6: note: candidate: 'template<unsigned int N> void work(std::bitset<N>&)'
    8 | void work(bitset<N> &S){
      |      ^~~~
a.cc:8:6: note:   template argument deduction/substitution failed:
a.cc:24:29: note:   mismatched types 'unsigned int' and 'long unsigned int'
   24 |                         work(S0);
      |                         ~~~~^~~~
a.cc:25:55: error: no matching function for call to 'work(std::bitset<200010>&)'
   25 |                         if (S0==T0){k%=2;if (k&1) work(S0);break;}
      |                                                   ~~~~^~~~
a.cc:8:6: note: candidate: 'template<unsigned int N> void work(std::bitset<N>&)'
    8 | void work(bitset<N> &S){
      |      ^~~~
a.cc:8:6: note:   template argument deduction/substitution failed:
a.cc:25:55: note:   mismatched types 'unsigned int' and 'long unsigned int'
   25 |                         if (S0==T0){k%=2;if (k&1) work(S0);break;}
      |                                                   ~~~~^~~~
Language: C++

#include<unordered_set>
#include<unordered_map>
using namespace std;

#define MAX 200002

int n;
int k;

deque<int> d;

char buf[MAX];

string ans;


int main(){
	cin >> n >> k;
	scanf("%s", buf);
	for (int i = 0; i < n; i++){
		if (buf[i] - 'A' == 0){
			d.push_back((i & 1) ^ 1);
		}
		else{
			d.push_back((i & 1));
		}
	}
	if (n == 1){
		k %= 2;
		d.front() ^= k;
		return 1;
	}
	else{
		int C = 0;
		while (k&&C <= 3 * n){
			k--;
			C++;
			if (d.front() == 1){
				d.front() = 0;
				continue;
			}
			d.pop_front();
			d.push_back(((n - 1) & 1) ^ 1);
		}
		if (k == 0){

		}
		else{
			if (d.front() == 0&&d[1]==0){  //B
			}
			else{
				k %= 2;
				if (k){
					d.front() ^= 1;
				}
			}
		}
	}
	for (int i = 0; i < d.size(); i++){
		int go = ((i % 2) == d[i]);
		ans.push_back('A' + go);
	}
	printf("%s\n", ans.c_str());
	return 0;
}

Compiler output:
a.cc:10:1: error: 'deque' does not name a type
   10 | deque<int> d;
      | ^~~~~
a.cc:14:1: error: 'string' does not name a type
   14 | string ans;
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:18:9: error: 'cin' was not declared in this scope
   18 |         cin >> n >> k;
      |         ^~~
a.cc:3:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    2 | #include<unordered_map>
  +++ |+#include <iostream>
    3 | using namespace std;
a.cc:19:9: error: 'scanf' was not declared in this scope
   19 |         scanf("%s", buf);
      |         ^~~~~
a.cc:22:25: error: 'd' was not declared in this scope
   22 |                         d.push_back((i & 1) ^ 1);
      |                         ^
a.cc:25:25: error: 'd' was not declared in this scope
   25 |                         d.push_back((i & 1));
      |                         ^
a.cc:30:17: error: 'd' was not declared in this scope
   30 |                 d.front() ^= k;
      |                 ^
a.cc:38:29: error: 'd' was not declared in this scope
   38 |                         if (d.front() == 1){
      |                             ^
a.cc:42:25: error: 'd' was not declared in this scope
   42 |                         d.pop_front();
      |                         ^
a.cc:49:29: error: 'd' was not declared in this scope
   49 |                         if (d.front() == 0&&d[1]==0){  //B
      |                             ^
a.cc:59:29: error: 'd' was not declared in this scope
   59 |         for (int i = 0; i < d.size(); i++){
      |                             ^
a.cc:61:17: error: 'ans' was not declared in this scope
   61 |                 ans.push_back('A' + go);
      |                 ^~~
a.cc:63:24: error: 'ans' was not declared in this scope
   63 |         printf("%s\n", ans.c_str());
      |                        ^~~
a.cc:63:9: error: 'printf' was not declared in this scope
   63 |         printf("%s\n", ans.c_str());
      |         ^~~~~~
a.cc:3:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
    2 | #include<unordered_map>
  +++ |+#include <cstdio>
    3 | using namespace std;
Language: C++

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

using ll=long long;
#define int ll

#define FOR(i,a,b) for(int i=int(a);i<int(b);i++)
#define REP(i,b) FOR(i,0,b)
#define MP make_pair
#define PB push_back
#define ALL(x) x.begin(),x.end()
#define REACH cerr<<"reached line "<<__LINE__<<endl
#define DBG(x) cerr<<"line "<<__LINE__<<" "<<#x<<":"<<x<<endl

using pi=pair<int,int>;
using vi=vector<int>;
using ld=long double;

template<class T,class U>
ostream& operator<<(ostream& os,const pair<T,U>& p){
	os<<"("<<p.first<<","<<p.second<<")";
	return os;
}

template<class T>
ostream& operator <<(ostream& os,const vector<T>& v){
	os<<"[";
	REP(i,(int)v.size()){
		if(i)os<<",";
		os<<v[i];
	}
	os<<"]";
	return os;
}

int read(){
	int i;
	scanf("%lld",&i);
	return i;
}

void printSpace(){
	printf(" ");
}

void printEoln(){
	printf("\n");
}

void print(int x,int suc=1){
	printf("%lld",x);
	if(suc==1)
		printEoln();
	if(suc==2)
		printSpace();
}

string readString(){
	static char buf[3341919];
	scanf("%s",buf);
	return string(buf);
}

char* readCharArray(){
	static char buf[3341919];
	static int bufUsed=0;
	char* ret=buf+bufUsed;
	scanf("%s",ret);
	bufUsed+=strlen(ret)+1;
	return ret;
}

template<class T,class U>
void chmax(T& a,U b){
	if(a<b)
		a=b;
}

template<class T,class U>
void chmin(T& a,U b){
	if(a>b)
		a=b;
}

template<class T>
T Sq(const T& t){
	return t*t;
}

const int inf=LLONG_MAX/3;

signed main(){
	int n=read(),k=read();
	string s=readString();
	int g=0,q;
	{
		REP(i,n){
			bool w=(s[i]=='A^(i&1));
			if(w){
				if(k>=2){
					g++;
					k-=2;
					if(k==0)q=0;
				}else{
					k--;
					q=1;
				}
			}else{
				k--;
				g++;
				if(k==0)q=0;
			}
			if(k==0)
				break;
		}
		if(k){
			if(n^1){
				g+=k/2;
				q=k&1;
			}
			else{
				g+=k;
				q=0;
			}
		}
	}
	string t;
	REP(i,n)
		if(i+g<n)
			t+=((g&1)^(s[i+g]=='A'))?'A':'B';
		else
			t+=((n-1-i)&1)?'B':'A';
	if(q){
		if(t[0]=='A')
			t[0]='B';
		else{
			REP(i,n-1)
				t[i]=t[i+1]=='A'?'B':'A';
			t[n-1]='A';
		}
	}
	cout<<t<<endl;
}


Compiler output:
a.cc:98:39: warning: missing terminating ' character
   98 |                         bool w=(s[i]=='A^(i&1));
      |                                       ^
a.cc:98:39: error: missing terminating ' character
   98 |                         bool w=(s[i]=='A^(i&1));
      |                                       ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:99:25: error: expected primary-expression before 'if'
   99 |                         if(w){
      |                         ^~
a.cc:98:39: error: expected ')' before 'if'
   98 |                         bool w=(s[i]=='A^(i&1));
      |                                ~      ^
      |                                       )
   99 |                         if(w){
      |                         ~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

const int MAXN = 100 + 10;
const int INF = (int)(1e9);

char opp(char c) {
    return ((c == 'A') ? 'B' : 'A');
}

void print_alter(char f, int t, int n) {
    for(int i = 0; i < t; ++i) cout << f;
    for(int i = t; i < n; ++i) {
        f = opp(f);
        cout << f;
    }
    cout << endl;
}

void solve(string &s, int k) {
    int n = s.length();
    int sc = 0;
    bool B = false;
    while (k > 0) {
        if (sc >= n) break;
        char f = (B) ? 'B' : (((sc % 2) == 1) ? opp(s[sc]) : s[sc]);
        B = false;
        --k;
        if (f == 'B') ++sc;
        else {
            B = true;
        }
    }
    if (k == 0) {
        if (sc == n)
            print_alter((((n % 2) == 0) ? 'B' : 'A'), 1, n);
        else {
            char f = (B) ? 'B' : (((sc % 2) == 1) ? opp(s[sc]) : s[sc]);
            cout << f;
            for(int i = sc + 1; i < n; ++i)
                cout << (((sc % 2) == 1) ? opp(s[i]) : s[i]);
            if (sc > 0) {
                char c = ((sc % 2) == 1) ? 'A' : 'B';
                print_alter(c, 1, sc);
            }
            else cout << endl;
        }
    }
    else {
        char f = ((n % 2) == 0) ? 'B' : 'A';
        if (f == 'B') --k;
        if ((k % 2) == 0) {
            print_alter('A', 1, n);
        }
        else {
            print_alter('B', 2, n);
        }
    }
}

void run() {
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;
    solve(s, i);
}

int main()
{
    //freopen("input.txt", "r", stdin);

    int ntests = 1;
    //cin >> ntests;
    for(int tc = 1; tc <= ntests; ++tc) {
        run();
    }
}


Compiler output:
a.cc: In function 'void run()':
a.cc:67:14: error: 'i' was not declared in this scope
   67 |     solve(s, i);
      |              ^
Language: C++

#include<algorithm>
#include<cmath>
#include<iomanip>
#include<iostream>
#include<map>
#include<numeric>
#include<queue>
#include<set>
#include<sstream>
#include<vector>
using namespace std;
using uint = unsigned int;
using ll = long long;
const int M = 1e9 + 7;
const ll MLL = 1e18L + 9;
#pragma unused(M)
#pragma unused(MLL)
#ifdef LOCAL
#include"rprint.hpp"
#else
template <class... T> void printl(T&&...){ }
template <class... T> void printc(T&&...){ }
template <class... T> void prints(T&&...){ }
template <class... T> void printd(T&&...){ }
#endif

int main(){
    // chrono::steady_clock clk;
    auto start = clk.now();
    int n, k;
    cin >> n >> k;
    string s; cin >> s;
    vector<int> ss(n);
    for(int i=0;i<n;i++){
        ss[i] = s[i] == 'A';
    }
    bool flip = false, fflip = false;;
    int idx = 0;
    for(int i=0;i<k;i++){
        if(flip ^ ss[idx]){
            ss[idx] = !ss[idx];
        }else{
            flip = !flip;
            idx++;
            if(idx == n){ idx = 0; }
        }
        // if(i % 1000000 == 0 && clk.now() - start > 1900ms){
        //     if(n % 2 && (k - i - 1) % 2){
        //         fflip = true;
        //     }
        //     break;
        // }
    }
    cout << (fflip ^ flip ^ ss[idx] ? 'A' : 'B');
    for(int i=1;i<n;i++){
        cout << (flip ^ ss[(idx + i) % n] ? 'A' : 'B');
    }
    cout << '\n';
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:29:18: error: 'clk' was not declared in this scope
   29 |     auto start = clk.now();
      |                  ^~~
Language: C++

#pragma comment(linker, "/STACK:1024000000,1024000000")
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <string>
using namespace std;
#define LL long long
#define mp make_pair
#define fr first
#define sc second
#define pb push_back
#define lc (x<<1)
#define rc ((x<<1)|1)
const int N=200005;
char s[N];
int a[N];
char cal(int x,int k){
    x^=k%2;return x?'A':'B';
}
int main(){
  //  freopen("in.txt","r",stdin);freopen("out.txt","w",stdout);
    int i,n,k;
    scanf("%d%d",&n,&k);
    scanf("%s",s+1);
    for (i=1;i<=n;i++) if (s[i]=='A') a[i]=1; else a[i]=0;
    int K=k,;
    for (i=1;i<=n;i++) {if (a[i]^((i-1)%2)) k-=2; else k--;if (k<=0) break;}
    if (i<n||i==n&&k==-1){
        int tp,j;
        if (k==-1) {tp=1;printf("B");} else tp=0;
        for (j=i+1;j<=n;j++) if (a[j]^((i-tp)%2)) printf("A"); else printf("B");
        tp+=n-i;
        for (j=tp+1;j<=n;j++) if (j%2==n%2) printf("A"); else printf("B");
        puts("");return 0;
    } 
    if (n%2==0){
        for (i=1;i<=n;i++) if (i%2==1) printf("B"); else printf("A");
        puts("");return 0;
    }
    if (k%2==0) {if (i%2==1) printf("B"); else printf("A");}
     else {if (i%2==0) printf("B"); else printf("A");}
    for (i=2;i<=n;i++) if (i%2==1) printf("B"); else printf("A");
    puts("");
    
  //  system("pause");
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:13: error: expected unqualified-id before ';' token
   31 |     int K=k,;
      |             ^
Language: C++

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

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int N,K;
string S;
string T;
void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N>>K>>S;
	
	int pos=0,rev=0,revn=0;
	while(K-->0)
		if(pos==N) break;
		
		if((S[pos]=='A') ^ rev ^ revn) {
			revn^=1;
		}
		else {
			pos++;
			revn = 0;
			rev ^=1;
		}
		
	}
	
	string R;
	if(pos==N) {
		while(R.size()<N) {
			if((N-R.size())%2==1) R+='A';
			else R+='B';
		}
		if(R[0]=='A' && K%2) R[0]='B';
	}
	else {
		int first=1;
		while(pos<N) {
			if(rev ^ ((first==1)&&revn)) {
				R+='A'+'B'-S[pos];
			}
			else {
				R+=S[pos];
			}
			pos++;
			first=0;
		}
		while(R.size()<N) {
			if((N-R.size())%2==1) R+='A';
			else R+='B';
		}
	}
	cout<<R<<endl;
	
	/*
	T=S;
	
	FOR(i,100) {
		int x=0,side=0;
		while(x>=0 && x<N) {
			S[x]='A'+'B'-S[x];
			if(side==0) {
				if(S[x]=='B') x--, side=1;
				else x++;
			}
			else {
				if(S[x]=='B') x++, side=0;
				else x--;
			}
		}
		
		if(T[0]=='A') T[0]='B';
		else {
			T=T.substr(1);
			FORR(c,T) c='A'+'B'-c;
			T+='A';
		}
		
		
		cout<<(i+1)<<"\t"<<S<<endl;
	}
	*/
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n';
	FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	solve(); return 0;
}


Compiler output:
a.cc:39:9: error: expected unqualified-id before 'if'
   39 |         if(pos==N) {
      |         ^~
a.cc:46:9: error: expected unqualified-id before 'else'
   46 |         else {
      |         ^~~~
a.cc:63:9: error: 'cout' does not name a type
   63 |         cout<<R<<endl;
      |         ^~~~
a.cc:94:1: error: expected declaration before '}' token
   94 | }
      | ^
Language: C++

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

void mf(){
	freopen("input.in","r",stdin);
	freopen("output.ou","w",stdout);
}
int a[100007];
int n, k;
// map<string, int> mm;
string convert(){
	string s = "";
	for(int i = 0; i<n;i++){
		s+=char(a[i]+'A');
	}
	return s;
}
inline bool check1(int res){
	if(abs(res- n/2) > 1)  return false;
	for(int i = 1; i < n;i++)
	if(a[i] == a[i-1]) return false;
	return true;
}
void solve(){
	cin>>n>>k;
	string st;
	// srand(time(NULL));
	// n = 100000;
	// for(int i = 0; i < n; i++) a[i] = rand()%2;
	cin>>st;
	int res = 0;
	for(int i = 0; i<n;i++) {
		a[i] = st[i]-'A';
		res+=a[i];
	}
	for(int j = 1; j<= k;j++){
		int dir = 1, p = -1;		
		while(true){
			p+=dir;
			if(p<0 || p>=n) break;
			if(a[p]== 0) dir = -dir;
			res -= a[p];
			a[p] = 1- a[p];
			res += a[p];
		}
		if(check1(res)){
			if(a[0]==1){
				for(int i = 0; i < n;i++)
					cout<<char( (1- i%2 ) + 'A');				
			}else{
				if((k-j)%2==0){
					for(int i= 0; i<n;i++)
						cout<<char((i%2)+'A');
				}else{
					cout<<'B';
					for(int i = 1;i<n;i++)
						cout<<char((i%2)+'A');
				}
			}
			return;
		}
	}
	for(int i = 0; i<n;i++)cout<<char(a[i]+'A');

}
void test(){
	// string x;cin>>x;
	srand(time(NULL));
	// n = x.length();	
	n = 13;
	for(int i = 0; i < n; i++) a[i] = rand()%2;
	string st = convert();
	cerr<<"START==\n"<<st<<"\n===\n";
	mm[st] = 0;
	for(int i = 1; i <=25; i++){
		int dir = 1, p = -1;
		while(true){
			p+=dir;
			if(p<0 || p>=n) break;
			if(a[p]== 0) dir = -dir;
			a[p] = 1- a[p];
		}
		st = convert();
		// cerr<<"step "<<i<<endl<<st<<"\n==="<<endl;
		cerr<<st<<endl;
		// if(mm.find(st) != mm.end()){
		// 	cerr<<st<<" ";
		// 	cerr<<i- mm[st]<<endl;
		// 	cerr<<mm[st]<<" "<<i<<endl;
		// 	mm[st] = i;
		// 	//break;		
		// }else{
		// 	mm[st] = i;
		// }
	}
}

int main(){
	ios_base::sync_with_stdio(false);
	#ifdef tuanh
	mf();
	#endif
	solve();
	return 0;
}

Compiler output:
a.cc: In function 'void test()':
a.cc:75:9: error: 'mm' was not declared in this scope; did you mean 'tm'?
   75 |         mm[st] = 0;
      |         ^~
      |         tm
Language: C++

#include<iostream>
#include<vector>
#include<queue>
#include<functional>
#include<map>
#include<set>
#include<string>

int main()
{
	std::string str;
	int N, K;
	std::cin >> N >> K;
	std::cin >> str;
	struct func_t
	{
		bool f;
		bool operator()(char c)
		{
			if ((f&&c == 'A') || (!f&&c == 'B'))
			{
				f ^= true;
				return true;
			}
			return false;
		}
	};

	int count{};
	while (!std::all_of(str.rbegin(), str.rend(), func_t{ true }))
	{
		bool d = false;
		int c{};
		while (c >= 0 && c < N)
		{
			if (!d)
			{
				if (str[c] == 'A')
				{
					str[c] = 'B';
					--c;
					d = true;
				}
				else
				{
					str[c] = 'A';
					++c;
				}
			}
			else
			{
				if (str[c] = 'A')
				{
					str[c] = 'B';
					++c;
					d = false;
				}
				else
				{
					str[c] = 'A';
					--c;
				}
			}
		}
		++count;
		if (count == K)
		{
			std::cout << str << std::endl;
			return 0;
		}
	}
	if ((K - count) % 2 == 0)
	{
		std::cout << str << std::endl;
	}
	else if (N % 2 == 1)
	{
		std::cout << "B" << str.substr(1) << std::endl;
	}

}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:22: error: 'all_of' is not a member of 'std'
   30 |         while (!std::all_of(str.rbegin(), str.rend(), func_t{ true }))
      |                      ^~~~~~
Language: C++

#include<cstdio>
const int MAX_N = 200000;
int a[MAX_N + 1];
int p[MAX_N + 1];
bool fst[MAX_N + 1];
bool check(int x, int y, int n) {
 for(int i = 1; i <= y; i++) fst[i] = true;
 for(int i = 1; i <= x; i++) {
 if(a[i] < a[i - 1]) return false;
 fst[a[i]] = false;
 }
 for(int i = y + 1; i < n; i++) {
 if(p[i] > p[i + 1]) return false;
 }
 int lt = 0;
 for(int i = 1; i <= y; i++) {
 if(fst[i]) {
 if(lt > p[i]) return false;
 lt = p[i];
 }
 }
 return true;
}
void solve(int n) {
 int  an1 = -1, an2 = -1;

 for(int i = 1; i <= n; i++) {
 scanf("%d", &a[i]);
 p[a[i]] = i;
 }
 for(int x = 0; x <= n; x++) {
 for(int y = x; y <= n; y++) {
 if(check(x, y, n)) {
 if(an1 == -1) an1 = x;
 an2 = x;
 }
 }
 }
 printf("%d %d\n", an1, an2);
}
int main() {
 int T;
 while(~scanf("%d", &T) solve(T);
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:24: error: expected ')' before 'solve'
   43 |  while(~scanf("%d", &T) solve(T);
      |       ~                ^~~~~~
      |                        )
Language: C++

#include <iostream>
#include <string>
#define llint long long

using namespace std;

int n;
string s;
int a[5000005];

llint adjust(llint p, llint x)
{
  if(x == 0 || x < a[p]) return -1;
  x = (x-a[p])/10*10 + a[p];
  if(n-p < 9){
    llint sum = 0, mul = 1;
    for(int i = p; i < n; i++){
      sum += mul * a[i];
      mul *= 10;
    }
    x = min(x, sum);
  }
  return x;
}

bool sub(llint p, llint x)
{
  //cout << "-" << x << endl;
  for(;x;x/=10){
    a[p] -= x % 10;
    llint t = p;
    while(a[t] < 0){
      a[t] += 10, a[t+1]--;
      t++;
    }
    p++;
  }
  return a[n-1] == 0;
}

bool check(llint x)
{
  //cout << "! " << x << endl;
  for(int i = 0; i < n; i++) a[i] = s[i]-'0';
  x *= 9;
  for(int i = 0; i < n; i++){
    x = adjust(i, x);
    if(x == -1) return false;
    if(sub(i, x)) break;
    //cout << "="; for(int i = n-1; i >= 0; i--) cout << a[i]; cout << endl;
  }
  return true;
}

int main(void)
{
  cin >> s;
  n = s.size();
  reverse(s.begin(), s.end());

  llint ub = n*2, lb = 0, mid;
  while(ub-lb>1){
    mid = (ub+lb)/2;
    if(check(mid)) ub = mid;
    else lb = mid;
  }
  cout << ub << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:59:3: error: 'reverse' was not declared in this scope
   59 |   reverse(s.begin(), s.end());
      |   ^~~~~~~
Language: C++

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int N=501010;
char s[N];
struct Bigint
{
    int a[N],n;
    int& operator [] (const int &x){return a[x];}
    Bigint(){memset(a,0,sizeof(a));n=0;}
    Bigint(char *s){n=strlen(s);for(int i=0;i<n;i++)a[i]=s[n-i-1]-'0';}
    void carry()
    {
        for(int i=0;i<n;i++)
        {
            if(a[i]<=9) continue;
            a[i+1]+=a[i]/10;
            a[i]%=10;
            if(i==n-1) n++;
        }
    }
    Bigint& operator *= (int x){for(int i=0;i<n;i++)a[i]*=x;carry();return *this;}
    int get(){int res=0;for(int i=0;i<n;i++)res+=a[i];return res;}
    void gao(int &sum)
    {
        a[0]+=9;sum+=9;
        for(int i=0;a[i]>9;i++)
        {
            sum-=a[i];sum-=a[i+1];
            a[i+1]+=a[i]/10;a[i]%=10;
            sum+=a[i];sum+=a[i+1];
            if(i==n-1) n++;
        }
    }
} A;
int main()
{
    scanf("%s",s);
    A=s;A*=9;
    int sum=A.get(),k;
    for(k=1;true;k++)
    {
        A.gao(sum);
        if(sum<=9*k&&sum%9==0) break;
    }
    cout<<k<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:47:5: error: 'cout' was not declared in this scope
   47 |     cout<<k<<endl;
      |     ^~~~
a.cc:4:1: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <algorithm>
  +++ |+#include <iostream>
    4 | using namespace std;
a.cc:47:14: error: 'endl' was not declared in this scope
   47 |     cout<<k<<endl;
      |              ^~~~
a.cc:4:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    3 | #include <algorithm>
  +++ |+#include <ostream>
    4 | using namespace std;
Language: C

#include<algorithm>
#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>
#include<queue>
#define inf 2147483647
#define eps 1e-9
using namespace std;
typedef long long ll;
int n,tot,a[800001];
char s[500001];
void mul(int a[],int &n,int k){
    int p=0;
    tot=0;
    for(int i=1;i<=n;i++){
        p=a[i]*k+p;
        a[i]=p%10;
        tot+=a[i];
        p/=10;
    }
    if(p)a[++n]=p;
    tot+=p;
}
void add(int a[],int &n,int k){
    int p=0;
    tot-=a[1];
    a[1]+=k;
    p=a[1]/10;
    a[1]%=10;
    tot+=a[1];
    for(int i=2;i<=n;i++){
        tot-=a[i];
        a[i]+=p;
        p=a[i]/10;
        a[i]%=10;
        tot+=a[i];
        if(!p)break;
    }
    if(p)a[++n]=p;
    tot+=p;
}
int main(){
    scanf("%s",s);
    n=strlen(s);
    for(int i=1;i<=n;i++){
        a[i]=s[n-i]-'0';
    }
    mul(a,n,9);
    for(int i=1;i<=n;i++){
        add(a,n,9);
        if(tot%9==0&&i*9>=tot)return printf("%d",i),0;
    }
    return 0;
}

Compiler output:
main.c:1:9: fatal error: algorithm: No such file or directory
    1 | #include<algorithm>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
char s[500010];
int main(){
    //freopen("in","r",stdin);
    //freopen("out1","w",stdout);
    scanf("%s",s+1);
    int n=strlen(s+1);
    for(int i=1;i<=n;i++) s[i]-='0';
    s[0]=0;
    int p=1,ans=0,flag=1,last=0;
    while(p<=n){
        //printf("p=%d\n",p);
        if(s[p]<s[p-1]){
            //printf("fake");
            //for(int i=p;i<=n;i++) printf("9");cout<<endl;
            ans+=p-last;
        //  printf("ans=%d\n",ans);
            //printf("last=%d ,%d p=%d ,%d ans=%d\n",last,s[last],p,s[p],ans);
            //p=last+1;
            //printf("%d",s[p-1]-1);
            s[p-1]=0;
            s[n]+=p-last;
            for(int i=n;i>=p;i--){
                if(s[i]<10) break;
                s[i-1]+=s[i]/10;
                s[i]%=10;
            }
            //cout<<endl;
            flag=1;
            last=p-1;
        //  for(int i=p;i<=n;i++) printf("%d",s[i]);cout<<endl;
        //  puts("------------------");
        }
        //printf("%d",s[p]);
        if(s[p]!=s[p-1]) last=p;
        p++;
    }
    cout<<ans+1<<endl;
    r

Compiler output:
a.cc: In function 'int main()':
a.cc:40:5: error: 'r' was not declared in this scope
   40 |     r
      |     ^
a.cc:40:6: error: expected '}' at end of input
   40 |     r
      |      ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

using namespace std;
namespace mp = boost::multiprecision;

int main() {
  mp::cpp_int N;
  cin >> N;
  N *= 9;

  auto check = [&](mp::cpp_int v) {
    v *= 9;
    auto x = (N + v).str();
    for(int i = 0; i < x.size(); i++) {
      v -= x[i] - '0';
      if(v < 0) return false;
    }
    return true;
  };

  int ok = 5000001, ng = 0;
  while(ok - ng > 1) {
    int mid = (ok + ng) / 2;
    if(check(mid)) ok = mid;
    else ng = mid;
  }
  cout << ok << endl;
}

Compiler output:
a.cc:2:10: fatal error: boost/multiprecision/cpp_int.hpp: No such file or directory
    2 | #include <boost/multiprecision/cpp_int.hpp>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int N=5e5+10;
char s[N];int n;
int main()
{
	gets(s+1);
	n=strlen(s+1);
	for (int i=1;i<=n;i++) s[i]-='0';
	s[n+1]=127;
	int ans=0;
	for (int p=1;p<=n;){
		ans++;
		for (int i=p,now=0;i<=n;i++){
			now=max(now,(int)s[i]);
			int j=i;
			while (s[j]==now) j++;			
			if (s[j]<now){
				now--;
				s[i]=0;
				int j=n;
				while (s[j]==9) s[j--]=0;
				s[j]++;
				break;
			}
			else{
				for (;i<j;s[i++]=0);
				i--;
			}
		}
		while (!s[p]&&p<=n) p++;
	}
	printf("%d\n",ans);
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s+1);
      |         ^~~~
      |         getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
long long n,num,shu[20];
long long read()
{
	long long ans=0;
	char ch=getchar();
	while(!isdigit(ch))
		ch=getchar();
	for(;isdigit(ch);ch=getchar())
	{
		assert(ans<1000000000000000000ll);
		ans=ans*10+ch-'0';
	}
	return ans;
}
int main()
{
	n=read();
	for(int i=1;i<=18;i++)
		value[i]=value[i-1]*10+1;
	for(int i=18;i;i--)
		while(n>=value[i])
		{
			n-=value[i];
			num++;
		}
	printf("%d",num/9+(num%9!=0));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:17: error: 'value' was not declared in this scope
   21 |                 value[i]=value[i-1]*10+1;
      |                 ^~~~~
a.cc:23:26: error: 'value' was not declared in this scope
   23 |                 while(n>=value[i])
      |                          ^~~~~
Language: C++

#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
typedef long long ll;
const int N = 500010;
char s[N];
int n,a[N],ans;
int main(){
	//freopen("in.txt","r",stdin);
	//scanf("%s",s);
	gets(s);
	n = strlen(s);
	reverse(s,s+n);
	for(int i=0;i<n;i++) a[i]=s[i]-'0';
	a[n] = 0;
	bool pd = false;
	int pos = n;
	for(int i=n-1;i>=0;i--){
		if(a[i]<a[i+1]){
			if(pd){
				a[0]++;
				for(int j=0;j<pos;j++) 
					if(a[j]>=10){
						a[j+1]++;
						a[j]-=10;
					} else break;
				ans++;
			}
			i = pos;
			a[i] = 0;
			pd=false;
		} else {
			if(a[i]>0) pd = true;
			if(a[i]!=a[i+1]) pos = i;
		}
	}
	ans++;
	printf("%d\n",ans);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   12 |         gets(s);
      |         ^~~~
      |         getw