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

#include <cstdio>

typedef long long LL;
const int N = 2e5 + 10;
const int Mod = 924844033;
const int M = (1 << 20) + 10;
struct E {int v, nt;} e[N<<1];
int n, L, tot, a[M], b[M], h[N], wn[30], fac[N], inv[N], rev[M];

inline int mls(int x) {return x < 0 ? x + Mod : x;}
inline int pls(int x) {return x >= Mod ? x - Mod : x;}
inline void add(int u, int v) {
	e[++tot] = (E){v, h[u]}, h[u] = tot;
	e[++tot] = (E){u, h[v]}, h[v] = tot;
}
template <class T> inline void swap(T &a, T &b) {T t = a; a = b, b = t;}
template <class T> inline void in(T &x) {
	x = 0; int f = 1; char ch = getchar();
	for (; ch<'0' || ch>'9';) {if (ch=='-') f=-1; ch = getchar();}
	for (; ch>='0' && ch<='9';) x = x*10 + ch-'0', ch = getchar();
	x *= f;
}

inline int qpow(int A, int B) {
	int S = 1;
	for (; B; B >>= 1, A = 1LL * A * A % Mod)
		if (B & 1) S = 1LL * S * A % Mod;
	return S;
}

inline int dfs(int x, int f) {
	int sz = 1;
	for (int v, i = h[x]; i; i = e[i].nt)
		if ((v = e[i].v) != f) sz += dfs(v, x);
	if (x != 1) ++a[sz], ++a[n - sz];
	return sz
}

inline void FFT(int *a, int n) {
	for (int i = 0; i < n; ++i) if (i < rev[i]) swap(a[i], a[rev[i]]);
	for (int i = 1, l = L-1; i < n; i <<= 1, --l)
		for (int j = 0; j < n; j += i << 1)
			for (int u, v, k = 0, w = 1; k < i; ++k, w = 1LL * w * wn[l] % Mod)
				u = a[j + k], v = 1LL * w * a[i + j + k] % Mod,
				a[j + k] = pls(u + v), a[i + j + k] = mls(u - v);
}

inline void Mul(int m) {
	int invn, n = 1;
	for (L = 0; n <= m; n <<= 1, ++L);
	invn = qpow(n, Mod - 2);
	for (int i = 1; i < n; ++i)
		rev[i] = (rev[i >> 1] >> 1) | ((i & 1) << L-1);
	
	wn[0] = qpow(5, Mod-1 >> L);
	for (int i = 1; i < L; ++i) wn[i] = 1LL * wn[i-1] * wn[i-1] % Mod;
	FFT(a, n), FFT(b, n);
	for (int i = 0; i < n; ++i) a[i] = 1LL * a[i] * b[i] % Mod;
	
	wn[0] = qpow(wn[0], Mod - 2);
	for (int i = 1; i < L; ++i) wn[i] = 1LL * wn[i-1] * wn[i-1] % Mod;
	FFT(a, n);
	for (int i = 0; i < n; ++i) a[i] = 1LL * a[i] * invn % Mod;
}

int main() {
	int u, v, ret; in(n);
	for (int i = 1; i < n; ++i) in(u), in(v), add(u, v);
	dfs(1, 0), fac[0] = fac[1] = inv[0] = inv[1] = 1;
	
	for (int i = 2; i <= n; ++i) inv[i] = 1LL * (Mod - Mod / i) * inv[Mod % i] % Mod;
	for (int i = 1; i <= n; ++i) inv[i] = 1LL * inv[i - 1] * inv[i] % Mod;
	for (int i = 1; i <= n; ++i) fac[i] = 1LL * fac[i - 1] * i % Mod;
	
	for (int i = 0; i <= n; ++i)
		a[i] = 1LL * a[i] * fac[n - i] % Mod, b[i] = inv[i];
	Mul(n << 1);
	
	for (int i = 1; i <= n; ++i) {
		ret = mls(1LL*n*fac[n]%Mod*inv[n-i]%Mod*inv[i]%Mod - 1LL*a[n-i]*inv[i]%Mod);
		printf("%d\n", ret);
	}
	return 0;
}

Compiler output:
a.cc: In function 'int dfs(int, int)':
a.cc:36:18: error: expected ';' before '}' token
   36 |         return sz
      |                  ^
      |                  ;
   37 | }
      | ~
Language: C++

#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;

const int maxn = 2e5, maxm = 19;
const int mod = 924844033, gen = 5;

int n;
vector<int> g[maxn];
int size[maxn], cnt[maxn];
int fact[maxn + 1], ifact[maxn + 1];
int a[maxn], b[maxn];

void Dfs(int u, int p) {
  size[u] = 1;
  for (int v : g[u]) {
    if (v == p) continue;
    Dfs(v, u);
    size[u] += size[v];
    ++cnt[size[v]];
    ++cnt[n - size[v]];
  }
}

inline int Mul(int a, int b) {
  return (long long)a * b % mod;
}

inline int Add(int a) {
  return a >= mod ? a - mod : a;
}

inline int Sub(int a) {
  return a < 0 ? a + mod : a;
}

int Pow(int a, int b) {
  int c = 1;
  for (; b; b >>= 1) {
    if (b & 1) c = Mul(c, a);
    a = Mul(a, a);
  }
  return c;
}

void FFT(int *a, int n) {
  for (int i = 0; i < 1 << n; ++i) {
    int j = 0, x = i;
    for (int k = 0; k < n; ++k) {
      j = (j << 1) | (x & 1);
      x >>= 1;
    }
    if (i < j) {
      swap(a[i], a[j]);
    }
  }
  for (int i = 0; i < n; ++i) {
    int root = Pow(gen, (mod - 1) / (2 << i));
    for (int j = 0; j < 1 << n; j += 2 << i) {
      int *l = a + j, *r = l + (1 << i), w = 1;
      for (int k = 0; k < 1 << i; ++k, w = Mul(w, root)) {
        int t = Mul(w, r[k]);
        r[k] = Sub(l[k] - t);
        l[k] = Add(l[k] + t);
      }
    }
  }
}

void IFFT(int *a, int n) {
  reverse(a + 1, a + (1 << n));
  FFT(a, n);
  int inv = Pow(1 << n, mod - 2);
  for (int i = 0; i < 1 << n; ++i) {
    a[i] = Mul(a[i], inv);
  }
}

int main(void) {
  scanf("%d", &n);
  for (int i = 0; i < n - 1; ++i) {
    int a, b;
    scanf("%d%d", &a, &b); --a; --b;
    g[a].push_back(b);
    g[b].push_back(a);
  }
  Dfs(0, -1);
  fact[0] = 1;
  for (int i = 1; i <= n; ++i) {
    fact[i] = Mul(fact[i - 1], i);
  }
  ifact[n] = Pow(fact[n], mod - 2);
  for (int i = n; i >= 1; --i) {
    ifact[i - 1] = Mul(ifact[i], i);
  }
  for (int i = 0; i < n; ++i) {
    a[i] = ifact[i];
  }
  for (int i = 1; i < n; ++i) {
    b[i] = Mul(cnt[n - i], fact[n - i]);
  }
  int m = 0;
  while (1 << m < n << 1) {
    ++m;
  }
  FFT(a, m);
  FFT(b, m);
  for (int i = 0; i < 1 << m; ++i) {
    a[i] = Mul(a[i], b[i]);
  }
  IFFT(a, m);
  for (int k = 1; k <= n; ++k) {
    int t = Mul(a[n - k], ifact[k]);
    int c = Mul(fact[n], Mul(ifact[k], ifact[n - k]));
    printf("%d\n", Sub(Mul(n, c) - t));
  }
  return 0;
}


Compiler output:
a.cc:10:1: error: 'vector' does not name a type
   10 | vector<int> g[maxn];
      | ^~~~~~
a.cc: In function 'void Dfs(int, int)':
a.cc:17:16: error: 'g' was not declared in this scope
   17 |   for (int v : g[u]) {
      |                ^
a.cc: In function 'int main()':
a.cc:85:5: error: 'g' was not declared in this scope
   85 |     g[a].push_back(b);
      |     ^
Language: C++

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <algorithm>
#include <cmath>
#include <iostream>
#include <sstream>
#include <set>
using namespace std;

const int mmod = 924844033;

vector<vector<int> > G;
vector<int> sz;
vector<int> parent;

  const int max_n = 499999;
    int fac[max_n], inv_fac[max_n];

	int inv_mod(int a, int b) {
		if (a == 1) return b;
		int div = mmod / a + 1;
		return inv_mod((a * (long long)div) % mmod, (b * (long long)div) % mmod);
	}

void go(int now, int prv) {
  sz[now] = 1;
  parent[now] = prv;
  for (int i=0; i<G[now].size(); i++) {
    if (prv == G[now][i]) continue;
    go(G[now][i], now);
    sz[now] += sz[G[now][i]];
  }
//  printf("sz[%d] = %d %d\n", now, sz[now], parent[now]);
}

long long combi(int a, int b) {
  if (b < 0 || b > a) return 0;
  long long res = fac[a];
  res = (res * inv_fac[b]) % mmod;
  res = (res * inv_fac[a-b]) % mmod;
  return res;
}

long long partial_combi(int a, int b) {
  if (b < 0 || b > a) return 0;
  long long res = fac[a];
//  res = (res * inv_fac[b]) % mmod;
  res = (res * inv_fac[a-b]) % mmod;
  return res;
}

int main()
{
  int N;
  cin >> N;
  G.resize(N);
  sz.resize(N);
  parent.resize(N);
  for (int i=0; i<N-1; i++) {
    int a, b;
    cin >> a >> b;
    a --;
    b --;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  go(0, -1);

  map<int, int> M;
  for (int i=0; i<N; i++) {
    int remain = N-1;
    for (int j=0; j<G[i].size(); j++) {
      int ssz = sz[G[i][j]];
      if (G[i][j] == parent[i]) continue;
      remain -= ssz;
      M[ssz] ++;
    }
    if (remain) M[remain] ++;
  }

  vector<int> what ,occ;
  for (auto a : M) {
//    printf("%d %d\n", a.first, a.second);
    what.push_back(a.first);
    occ.push_back(a.second);
  }

  fac[0] = inv_fac[0] = 1;
  for (int i=1; i<max_n; i++) {
    fac[i] = (fac[i-1] * 1LL * i) % mmod;
    inv_fac[i] = inv_mod(fac[i], 1);
  }

  for (int K=1; K<=N; K++) {
    int res = 0;
    for (int idx = 0; idx < what.size(); idx ++) {
      int ww = what[idx];
      int oo = occ[idx];
      res = (res - 1LL * partial_combi(ww, K) * oo) % mmod;
    }
    res = (res * inv_fac[b]) % mmod;
    res = (res + 1LL * combi(N, K) * N) % mmod;
    res = (res + mmod) % mmod;
    printf("%lld\n", res);
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:106:26: error: 'b' was not declared in this scope
  106 |     res = (res * inv_fac[b]) % mmod;
      |                          ^
Language: C++

#include <math.h>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <algorithm>
#include <cmath>
#include <iostream>
#include <sstream>
#include <set>
using namespace std;

const int mmod = 924844033;

vector<vector<int> > G;
vector<int> sz;
vector<int> parent;

  const int max_n = 499999;
    int fac[max_n], inv_fac[max_n];

	int inv_mod(int a, int b) {
		if (a == 1) return b;
		int div = mmod / a + 1;
		return inv_mod((a * (long long)div) % mmod, (b * (long long)div) % mmod);
	}

void go(int now, int prv) {
  sz[now] = 1;
  parent[now] = prv;
  for (int i=0; i<G[now].size(); i++) {
    if (prv == G[now][i]) continue;
    go(G[now][i], now);
    sz[now] += sz[G[now][i]];
  }
//  printf("sz[%d] = %d %d\n", now, sz[now], parent[now]);
}

long long combi(int a, int b) {
  if (b < 0 || b > a) return 0;
  long long res = fac[a];
  res = (res * inv_fac[b]) % mmod;
  res = (res * inv_fac[a-b]) % mmod;
  return res;
}

long long partial_combi(int a, int b) {
  if (b < 0 || b > a) return 0;
  long long res = fac[a];
//  res = (res * inv_fac[b]) % mmod;
  res = (res * inv_fac[a-b]) % mmod;
  return res;
}

int main()
{
  int N;
  cin >> N;
  G.resize(N);
  sz.resize(N);
  parent.resize(N);
  for (int i=0; i<N-1; i++) {
    int a, b;
    cin >> a >> b;
    a --;
    b --;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  go(0, -1);

  map<int, int> M;
  for (int i=0; i<N; i++) {
    int remain = N-1;
    for (int j=0; j<G[i].size(); j++) {
      int ssz = sz[G[i][j]];
      if (G[i][j] == parent[i]) continue;
      remain -= ssz;
      M[ssz] ++;
    }
    if (remain) M[remain] ++;
  }

  vector<int> what ,occ;
  for (auto a : M) {
//    printf("%d %d\n", a.first, a.second);
    what.push_back(a.first);
    occ.push_back(a.second);
  }

  fac[0] = inv_fac[0] = 1;
  for (int i=1; i<max_n; i++) {
    fac[i] = (fac[i-1] * 1LL * i) % mmod;
    inv_fac[i] = inv_mod(fac[i], 1);
  }

  for (int K=1; K<=N; K++) {
    for (int idx = 0; idx < what.size(); idx ++) {
      int ww = what[idx];
      int oo = occ[idx];
      res = (res - 1LL * partial_combi(ww, K) * oo) % mmod;
    }
    res = (res * inv_fac[b]) % mmod;
    res = (res + 1LL * combi(N, K) * N) % mmod;
    res = (res + mmod) % mmod;
    printf("%lld\n", res);
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:103:7: error: 'res' was not declared in this scope
  103 |       res = (res - 1LL * partial_combi(ww, K) * oo) % mmod;
      |       ^~~
a.cc:105:5: error: 'res' was not declared in this scope
  105 |     res = (res * inv_fac[b]) % mmod;
      |     ^~~
a.cc:105:26: error: 'b' was not declared in this scope
  105 |     res = (res * inv_fac[b]) % mmod;
      |                          ^
Language: C++

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

int main() {
    string s;
    cin >> s;
    printf("%s %s",s.substr(0,4),s.substr(4))
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:46: error: expected ';' before '}' token
    7 |     printf("%s %s",s.substr(0,4),s.substr(4))
      |                                              ^
      |                                              ;
    8 | }
      | ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define _GLIBCXX_DEBUG
#define rep(i, from, to) for (int i = from; i < (to); ++i)
#define mp(x,y) make_pair(x,y)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
#define pb push_back
using ll = long long;
using vin=vector<int>;
using vll=vector<ll>;
using vst=vector<string>;
using P = pair<ll,ll>;
const int inf=1e9+7;
const ll INF=9e18;
template <typename T> bool chmin(T &a, const T& b){if(a > b){a = b;return true;}return false;}
template <typename T> bool chmax(T &a, const T& b){if(a < b){a = b;return true;}return false;}
template<class T> inline void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
template<class T> inline void YES(T condition){ if(condition) cout << "YES" << endl; else cout << "NO" << endl; }
const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };

int main(){cout<<fixed<<setprecision(20);
		   string s;
           cin>>s;
           rep(i,0,4)cout<<s[i];
           cout<<" ";
           rep(0,4,12)cout<<s[i];
           cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:16: error: expected unqualified-id before numeric constant
   28 |            rep(0,4,12)cout<<s[i];
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:28:16: error: expected ';' before numeric constant
   28 |            rep(0,4,12)cout<<s[i];
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:28:16: error: lvalue required as left operand of assignment
   28 |            rep(0,4,12)cout<<s[i];
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:4:53: error: expected ')' before ';' token
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                              ~                      ^
a.cc:28:12: note: in expansion of macro 'rep'
   28 |            rep(0,4,12)cout<<s[i];
      |            ^~~
a.cc:28:16: error: lvalue required as increment operand
   28 |            rep(0,4,12)cout<<s[i];
      |                ^
a.cc:4:57: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define _GLIBCXX_DEBUG
#define rep(i, from, to) for (int i = from; i < (to); ++i)
#define mp(x,y) make_pair(x,y)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
#define pb push_back
using ll = long long;
using vin=vector<int>;
using vll=vector<ll>;
using vst=vector<string>;
using P = pair<ll,ll>;
const int inf=1e9+7;
const ll INF=9e18;
template <typename T> bool chmin(T &a, const T& b){if(a > b){a = b;return true;}return false;}
template <typename T> bool chmax(T &a, const T& b){if(a < b){a = b;return true;}return false;}
template<class T> inline void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
template<class T> inline void YES(T condition){ if(condition) cout << "YES" << endl; else cout << "NO" << endl; }
const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };

int main(){cout<<fixed<<setprecision(20);
		   string s;
           cin>>s;
           rep(i,0,4)cout<<s[i];
           cout<<" ";
           rep(0,4,12)cout<<s[i]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:16: error: expected unqualified-id before numeric constant
   28 |            rep(0,4,12)cout<<s[i]<<endl;
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:28:16: error: expected ';' before numeric constant
   28 |            rep(0,4,12)cout<<s[i]<<endl;
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:28:16: error: lvalue required as left operand of assignment
   28 |            rep(0,4,12)cout<<s[i]<<endl;
      |                ^
a.cc:4:35: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                   ^
a.cc:4:53: error: expected ')' before ';' token
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                              ~                      ^
a.cc:28:12: note: in expansion of macro 'rep'
   28 |            rep(0,4,12)cout<<s[i]<<endl;
      |            ^~~
a.cc:28:16: error: lvalue required as increment operand
   28 |            rep(0,4,12)cout<<s[i]<<endl;
      |                ^
a.cc:4:57: note: in definition of macro 'rep'
    4 | #define rep(i, from, to) for (int i = from; i < (to); ++i)
      |                                                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
   string S;
   cin>>S;
   for(int i=0;i<12;i++){
     cout<<S[i];
     if(i==3){
       cout<<" ";
       break;
     }
   }
    for(int i=4;i<=12;i++){
      cout<<S[i];
　　　}
  cout<<endl;
}

Compiler output:
a.cc:15:1: error: extended character 　 is not valid in an identifier
   15 | 　　　}
      | ^
a.cc:15:1: error: extended character 　 is not valid in an identifier
a.cc:15:1: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:15:1: error: '\U00003000\U00003000\U00003000' was not declared in this scope
   15 | 　　　}
      | ^~~~~~
Language: C++

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

int main() {
  string s;
  cin >> s;
  cout << s.at(0) << s.at(1) << s.at(2) << s.at(3) << ' ' << s.at(4) << s,at(5) << s.at(6) << s.at(7) << s.at(8) << s.at(9) << s.at(10) << s.at(11) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:75: error: 'at' was not declared in this scope
   10 |   cout << s.at(0) << s.at(1) << s.at(2) << s.at(3) << ' ' << s.at(4) << s,at(5) << s.at(6) << s.at(7) << s.at(8) << s.at(9) << s.at(10) << s.at(11) << endl;
      |                                                                           ^~
Language: C++

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

int main(){
  string s;
  cin>>s;
  for(int i=0;i<=3;i++){
    cout<<s[i];
  }
  cout<<" ";
  for(int i=4;i<=s.size()){
    cout<<s[i];
  }
  cout<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:26: error: expected ';' before ')' token
   11 |   for(int i=4;i<=s.size()){
      |                          ^
      |                          ;
Language: Java

import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    char[] ch=sc.next().toCharArray();
    StringBuffer sb=new StringBuffer();
    for(int i=0;i<12;i++){
      if(i=3){
        sb.append(ch[i]+" ");
      }else{
        sb.append(ch[i]);
      }
    }
    System.out.println(sb);
  }
}

Compiler output:
Main.java:8: error: incompatible types: int cannot be converted to boolean
      if(i=3){
          ^
1 error
Language: C++

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

int main(){
  string s;
  cin>>s;
  for(int i=0;i<n;i++){
    if(i==4){
      cout<<" "<<flush;
    }
    cout<<s[i]<<flush;
  }
  cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: 'n' was not declared in this scope
    7 |   for(int i=0;i<n;i++){
      |                 ^
Language: C++

//#include <tourist>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v)          \
    cout << #v << ":";    \
    for (auto x : v)      \
    {                     \
        cout << x << ' '; \
    }                     \
    cout << endl;
template <class T>
bool chmax(T &a, const T &b)
{
    if (a < b)
    {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
    if (b < a)
    {
        a = b;
        return 1;
    }
    return 0;
}
//cout<<fixed<<setprecision(15);有効数字15桁
//-std=c++14
//-std=gnu++17
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
ll n, m;
int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >>s;
    rep(i,4){
        cout<<s[i];
    }
    cout<<" ";
    rep(i,8){
        cout<<s[4+i];
    }
    cout<<"\n";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:54:11: error: 's' was not declared in this scope
   54 |     cin >>s;
      |           ^
Language: C++

#include<bits/stdc++.h>
using nameapsce std;
int main()
{
  string s;
  cin>>s;
  for(int i=0;i<12;i++)
  {cout<<s[i];
   if(i==3)cout<<" ";}
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'nameapsce'
    2 | using nameapsce std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string s;
      |   ^~~~~~
a.cc:5:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>s;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s;
      |        ^
a.cc:8:4: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   {cout<<s[i];
      |    ^~~~
      |    std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

//#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
const long long INF= 1e+18+1;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vector<ll> >vvl;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> T;
const ll MOD=1000000007LL;
string abc="abcdefghijklmnopqrstuvwxyz";
string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int main(){
  string s;cin>>s;
  rep(i,n){
    cout<<s[i];
    if(i==3)cout<<" ";
  }
  cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:9: error: 'n' was not declared in this scope
   17 |   rep(i,n){
      |         ^
a.cc:5:43: note: in definition of macro 'rep'
    5 | #define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
      |                                           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    cin>>s;
    for(int i=0;i<4;i++)
    cout<<s[i];
    cout<<" ";
    for(int i=4;i<=s.size;i++)
    cout<<s[i];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:22: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
   10 |     for(int i=4;i<=s.size;i++)
      |                    ~~^~~~
      |                          ()
Language: C++

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    for(int i=1;i<=12;i++)
    {
        cout<<getchar();
        if(i==4)
            putchar(" ");
    }
    cout<<"\n";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   10 |             putchar(" ");
      |                     ^~~
      |                     |
      |                     const char*
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 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/stdio.h:618:25: note:   initializing argument 1 of 'int putchar(int)'
  618 | extern int putchar (int __c);
      |                     ~~~~^~~
Language: C++

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    for(int i=1;i<=12;i++)
    {
        putchar(getchar());
        if(i==4)
            putchar(" ");
    }
    cout<<"\n";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   10 |             putchar(" ");
      |                     ^~~
      |                     |
      |                     const char*
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 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/stdio.h:618:25: note:   initializing argument 1 of 'int putchar(int)'
  618 | extern int putchar (int __c);
      |                     ~~~~^~~
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;
#define rep(i,n) for (int i=0;i < (int)(n);i++)

int main(){
   string s,t;
  cin >> s;
  t=substr(0,4);
  s=substr(4,8);
  cout << t+" "+s << endl;
  
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'substr' was not declared in this scope
   12 |   t=substr(0,4);
      |     ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  char s[13];
  cin >> s;
  for(inti=0;i<12;i++){
    cout << s[i];
    if(i==3){
      cout << " ";
    }
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:7: error: 'inti' was not declared in this scope; did you mean 'int'?
    6 |   for(inti=0;i<12;i++){
      |       ^~~~
      |       int
a.cc:6:14: error: 'i' was not declared in this scope
    6 |   for(inti=0;i<12;i++){
      |              ^
Language: C++

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

int main() {
  string s;
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    cout << s.at(i);
  }
  if (i == 3) {
    cout << ' ';
  }
  cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: 'i' was not declared in this scope
   10 |   if (i == 3) {
      |       ^
Language: C++

#include <iostream>

char n[13];

int main(){
 	cin>>n;
  for(int i=0;i<4;i++)cout<<n[i];
 cout<<" ";
  for(int i=4;i<12;i++)cout<<n[i];
  
 return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |         cin>>n;
      |         ^~~
      |         std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:23: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   for(int i=0;i<4;i++)cout<<n[i];
      |                       ^~~~
      |                       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:8:2: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |  cout<<" ";
      |  ^~~~
      |  std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C

(defun in()
  (let ((s (read-char)))
	(if (or (eq s nil) (eq s #\space) (eq s #\newline))
	  (in)
	  s)))

(defun func (x)
  (when (< x 12)
	(progn
	  (when (eq x 4)
		(princ " "))
	  (princ (in))
	  (func (1+ x)))))

(func 0)
(princ #\newline)


Compiler output:
main.c:1:7: error: expected ')' before 'in'
    1 | (defun in()
      |       ^~~
      |       )
main.c:3:34: error: stray '#' in program
    3 |         (if (or (eq s nil) (eq s #\space) (eq s #\newline))
      |                                  ^
main.c:3:35: error: stray '\' in program
    3 |         (if (or (eq s nil) (eq s #\space) (eq s #\newline))
      |                                   ^
main.c:3:49: error: stray '#' in program
    3 |         (if (or (eq s nil) (eq s #\space) (eq s #\newline))
      |                                                 ^
main.c:3:50: error: stray '\' in program
    3 |         (if (or (eq s nil) (eq s #\space) (eq s #\newline))
      |                                                  ^
main.c:16:8: error: stray '#' in program
   16 | (princ #\newline)
      |        ^
main.c:16:9: error: stray '\' in program
   16 | (princ #\newline)
      |         ^
Language: C++

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

int main()
{
    string s;
    cin >> s;
    for(int i = 0; i < 4; i++) cout << s[i];
    cout << " ";
    for(int i = 4; i < 12; i++) cout << s[i];
    cout << endl;
}

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

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;

int main() {
  for (int i = 0; i< 4; i++){
    char j; cin >> j;
        cout << j;
}
cout << " ";
for (int i = 0; i < 8; i++) {
  char j; cin >> j;
  cout << j;
}
cout << endl;



Compiler output:
a.cc: In function 'int main()':
a.cc:17:14: error: expected '}' at end of input
   17 | cout << endl;
      |              ^
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;

int main() {
  for (int i = 0; i< 4; i++)
    char j; cin >> j;
        cout << j;
}
cout << " ";
for (int i = 0; i < 8; i++) {
  char j; cin >> j;
  cout << j;
}
cout << endl;



Compiler output:
a.cc: In function 'int main()':
a.cc:9:20: error: 'j' was not declared in this scope; did you mean 'jn'?
    9 |     char j; cin >> j;
      |                    ^
      |                    jn
a.cc: At global scope:
a.cc:12:1: error: 'cout' does not name a type
   12 | cout << " ";
      | ^~~~
a.cc:13:1: error: expected unqualified-id before 'for'
   13 | for (int i = 0; i < 8; i++) {
      | ^~~
a.cc:13:17: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                 ^
a.cc:13:24: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                        ^
a.cc:17:1: error: 'cout' does not name a type
   17 | cout << endl;
      | ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;

int main() {
  for (int i = 0; i< 4; i++)
    char i; cin >> i;
        cout << i;
}
cout << " ";
for (int i = 0; i < 8; i++) {
  char i; cin >> i;
  cout << i;
}
cout << endl;



Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: redeclaration of 'char i'
    9 |     char i; cin >> i;
      |          ^
a.cc:8:12: note: 'int i' previously declared here
    8 |   for (int i = 0; i< 4; i++)
      |            ^
a.cc:9:20: error: 'i' was not declared in this scope
    9 |     char i; cin >> i;
      |                    ^
a.cc: At global scope:
a.cc:12:1: error: 'cout' does not name a type
   12 | cout << " ";
      | ^~~~
a.cc:13:1: error: expected unqualified-id before 'for'
   13 | for (int i = 0; i < 8; i++) {
      | ^~~
a.cc:13:17: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                 ^
a.cc:13:24: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                        ^
a.cc:17:1: error: 'cout' does not name a type
   17 | cout << endl;
      | ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;

int main() {
  for (int i = 0; i< 4; i++)
    char i; cin >> i;
        cout << i;
}
cout << " " << endl;
for (int i = 0; i < 8; i++) {
  char i; cin >> i;
  cout << i;
}
cout << endl;



Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: redeclaration of 'char i'
    9 |     char i; cin >> i;
      |          ^
a.cc:8:12: note: 'int i' previously declared here
    8 |   for (int i = 0; i< 4; i++)
      |            ^
a.cc:9:20: error: 'i' was not declared in this scope
    9 |     char i; cin >> i;
      |                    ^
a.cc: At global scope:
a.cc:12:1: error: 'cout' does not name a type
   12 | cout << " " << endl;
      | ^~~~
a.cc:13:1: error: expected unqualified-id before 'for'
   13 | for (int i = 0; i < 8; i++) {
      | ^~~
a.cc:13:17: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                 ^
a.cc:13:24: error: 'i' does not name a type
   13 | for (int i = 0; i < 8; i++) {
      |                        ^
a.cc:17:1: error: 'cout' does not name a type
   17 | cout << endl;
      | ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
typedef long long ll;

int main() {
  for (int i = 0, i< 4; i++)
    char i; cin >> i;
        cout << i;
}
cout << " " << endl;
for (int i = 09; i < 8; i++) {
  char i; cin >> i;
  cout << i;
}
cout << endl;



Compiler output:
a.cc:13:14: error: invalid digit "9" in octal constant
   13 | for (int i = 09; i < 8; i++) {
      |              ^~
a.cc: In function 'int main()':
a.cc:8:20: error: expected ';' before '<' token
    8 |   for (int i = 0, i< 4; i++)
      |                    ^
      |                    ;
a.cc:8:20: error: expected primary-expression before '<' token
a.cc:9:10: error: redeclaration of 'char i'
    9 |     char i; cin >> i;
      |          ^
a.cc:8:12: note: 'int i' previously declared here
    8 |   for (int i = 0, i< 4; i++)
      |            ^
a.cc:9:20: error: 'i' was not declared in this scope
    9 |     char i; cin >> i;
      |                    ^
a.cc: At global scope:
a.cc:12:1: error: 'cout' does not name a type
   12 | cout << " " << endl;
      | ^~~~
a.cc:13:1: error: expected unqualified-id before 'for'
   13 | for (int i = 09; i < 8; i++) {
      | ^~~
a.cc:13:18: error: 'i' does not name a type
   13 | for (int i = 09; i < 8; i++) {
      |                  ^
a.cc:13:25: error: 'i' does not name a type
   13 | for (int i = 09; i < 8; i++) {
      |                         ^
a.cc:17:1: error: 'cout' does not name a type
   17 | cout << endl;
      | ^~~~
Language: Java

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    System.out.println(s.substr(0, 4) + " " + s.substr(4, 8));
  }
}

Compiler output:
Main.java:7: error: cannot find symbol
    System.out.println(s.substr(0, 4) + " " + s.substr(4, 8));
                        ^
  symbol:   method substr(int,int)
  location: variable s of type String
Main.java:7: error: cannot find symbol
    System.out.println(s.substr(0, 4) + " " + s.substr(4, 8));
                                               ^
  symbol:   method substr(int,int)
  location: variable s of type String
2 errors
Language: C++

#include<iostream>
using namespace std;
int main(void){
  string s;
  cin >> s;
  s = s.insert(3," ");
  cout << s);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: expected ';' before ')' token
    7 |   cout << s);
      |            ^
      |            ;
Language: C++

#include<iostream>
using namespace std;
int main(void){
  string s;
  cout << s.substring(0,4) << " " <<s.substring(4,8);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:13: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'substring'; did you mean 'substr'?
    5 |   cout << s.substring(0,4) << " " <<s.substring(4,8);
      |             ^~~~~~~~~
      |             substr
a.cc:5:39: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'substring'; did you mean 'substr'?
    5 |   cout << s.substring(0,4) << " " <<s.substring(4,8);
      |                                       ^~~~~~~~~
      |                                       substr
Language: C++

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

int main() {
string S; cin>>S;
  cout<<S.at(0)<<S.at(1)<<S.at(2)<<S.at(3)<<" "<<S.at(4)<<S.at(5)<<S.at(6)<<S.at(7)<<S.at(8)<<S.at(9)<<S.at(10)<<S>at(11)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:116: error: 'at' was not declared in this scope
    6 |   cout<<S.at(0)<<S.at(1)<<S.at(2)<<S.at(3)<<" "<<S.at(4)<<S.at(5)<<S.at(6)<<S.at(7)<<S.at(8)<<S.at(9)<<S.at(10)<<S>at(11)<<endl;
      |                                                                                                                    ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string a;
  cin>>a;
  cout<<a[0]<<a[1]<<a[2]<<a[3]<<a[4]<<' '<<a[5]<<a[6]<<a[7]<<a[8]<<a[9]<<a\
[10]<<a[11]<<'\n';
}#include<bits/stdc++.h>
using namespace std;
int main(){
  string a;
  cin>>a;
  cout<<a[0]<<a[1]<<a[2]<<a[3]<<a[4]<<' '<<a[5]<<a[6]<<a[7]<<a[8]<<a[9]<<a
    [10]<<a[11]<<'\n';
  return 0;
}









Compiler output:
a.cc:8:2: error: stray '#' in program
    8 | }#include<bits/stdc++.h>
      |  ^
a.cc:8:3: error: 'include' does not name a type
    8 | }#include<bits/stdc++.h>
      |   ^~~~~~~
a.cc:10:5: error: redefinition of 'int main()'
   10 | int main(){
      |     ^~~~
a.cc:3:5: note: 'int main()' previously defined here
    3 | int main(){
      |     ^~~~
Language: Java

import java.util.*;

class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    String s=sc.next();
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
  }
}

Compiler output:
Main.java:7: error: cannot find symbol
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
                        ^
  symbol:   method subString(int,int)
  location: variable s of type String
Main.java:7: error: cannot find symbol
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
                                             ^
  symbol:   method subString(int,int)
  location: variable s of type String
2 errors
Language: Java

import java.util.*;

class Main{
  public static void main(tring args[]){
    Scanner sc = new Scanner(System.in);
    String s=sc.next();
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
  }
}

Compiler output:
Main.java:4: error: cannot find symbol
  public static void main(tring args[]){
                          ^
  symbol:   class tring
  location: class Main
Main.java:7: error: cannot find symbol
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
                        ^
  symbol:   method subString(int,int)
  location: variable s of type String
Main.java:7: error: cannot find symbol
    System.out.println(s.subString(0,4)+" "+s.subString(4,12));
                                             ^
  symbol:   method subString(int,int)
  location: variable s of type String
3 errors
Language: C++

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

int main()
{
 string s;
  cin >> s;
  
  for (int i = 0;i < 4; i++)
    cout << i[s];
  cout << " ";
  for (int i = 4;i < s.length();i++)
    cout << s[i];
  cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: no match for 'operator[]' (operand types are 'int' and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   10 |     cout << i[s];
      |              ^
Language: C++

#include<iostream>
using namespace std;
inr main(){
    string str;
    cin >> str;
    for(int i=0;i<12;i++){
        cout << str[i];
        if(i==3) cout << ' ';
    }
    cout << endl;
}

Compiler output:
a.cc:3:1: error: 'inr' does not name a type; did you mean 'int'?
    3 | inr main(){
      | ^~~
      | int
Language: C++

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

int main() {
  string a;
  cin >> a;
  for(int i = 0; i < a.aize(); i++){
    cout << a.at(i);
    if(i == 3)
      cout << ' ';
    else if(i == a.size() - 1)
      cout << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:24: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'aize'; did you mean 'size'?
    7 |   for(int i = 0; i < a.aize(); i++){
      |                        ^~~~
      |                        size
Language: C++

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

int main() {
  string s;
  cin >> s;
  string str1"1234", str2, str3"12345678";
  str2 = " ";
  for (int i = 0; i < 4; i++) {
    str1.at(i) = s.at(i);
  }
  for (int i = 0; i < 8; i++) {
    str3.at(i) = s.at(i + 4);
  }
  cout << str1 << str2 << str3 << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: expected initializer before string constant
    7 |   string str1"1234", str2, str3"12345678";
      |              ^~~~~~
a.cc:8:3: error: 'str2' was not declared in this scope
    8 |   str2 = " ";
      |   ^~~~
a.cc:10:5: error: 'str1' was not declared in this scope
   10 |     str1.at(i) = s.at(i);
      |     ^~~~
a.cc:13:5: error: 'str3' was not declared in this scope
   13 |     str3.at(i) = s.at(i + 4);
      |     ^~~~
a.cc:15:11: error: 'str1' was not declared in this scope
   15 |   cout << str1 << str2 << str3 << endl;
      |           ^~~~
a.cc:15:27: error: 'str3' was not declared in this scope
   15 |   cout << str1 << str2 << str3 << endl;
      |                           ^~~~
Language: C++

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

int main(){
  string s; cin >> s;
  for(int i=0; i<s.length(); i++){
    cout << s[i]
    if(i == 3){cout << " ";}
  }
  cout << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: expected ';' before 'if'
    8 |     cout << s[i]
      |                 ^
      |                 ;
    9 |     if(i == 3){cout << " ";}
      |     ~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<vector<int>> vvi;

ll gcd(ll a,ll b){
  if (a%b==0) return(b);
  else return(gcd(b,a%b));
}
ll lcm(ll a,ll b){
  return a*b/gcd(a,b);
}

vector<int> bfs(vvi L,int S){
  vector<int> v(L.size(),-1);
  v[S]=0;
  queue<int> q;
  q.push(S);
  while(!q.empty()){
    int a=q.front();
    q.pop();
    for(int x:L[a]){
      if (v[x]==-1){
        v[x]=v[a]+1;
        q.push(x);
      }
    }
  }
  return v;
}

void initialize(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(15);
}
/////////////////////////////////////////

int main(){
  initialize();
  string S;
  cin >> S;
  rep(1,4) cout << S[i];
  cout << " ";
  rep(i,8) cout << S[i+4];
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:45:7: error: expected unqualified-id before numeric constant
   45 |   rep(1,4) cout << S[i];
      |       ^
a.cc:2:26: note: in definition of macro 'rep'
    2 | #define rep(i,n) for(int i=0;i<n;i++)
      |                          ^
a.cc:45:7: error: expected ';' before numeric constant
   45 |   rep(1,4) cout << S[i];
      |       ^
a.cc:2:26: note: in definition of macro 'rep'
    2 | #define rep(i,n) for(int i=0;i<n;i++)
      |                          ^
a.cc:45:7: error: lvalue required as left operand of assignment
   45 |   rep(1,4) cout << S[i];
      |       ^
a.cc:2:26: note: in definition of macro 'rep'
    2 | #define rep(i,n) for(int i=0;i<n;i++)
      |                          ^
a.cc:2:33: error: expected ')' before ';' token
    2 | #define rep(i,n) for(int i=0;i<n;i++)
      |                     ~           ^
a.cc:45:3: note: in expansion of macro 'rep'
   45 |   rep(1,4) cout << S[i];
      |   ^~~
a.cc:45:7: error: lvalue required as increment operand
   45 |   rep(1,4) cout << S[i];
      |       ^
a.cc:2:34: note: in definition of macro 'rep'
    2 | #define rep(i,n) for(int i=0;i<n;i++)
      |                                  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  char a;
  for (int i = 0; i < 13; i++) {
    if (i == 4) {
      cout << ' ';
    } else {
      cin >> a;
      cout << a;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:2: error: expected '}' at end of input
   12 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string a;
  cin >> a;
  for (int i == 12; i > 6; i++) {
    a[i] = a[i - 1];
  }
  a[4] = ' ';
  cout << a;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: expected ';' before '==' token
    6 |   for (int i == 12; i > 6; i++) {
      |             ^~~
      |             ;
a.cc:6:14: error: expected primary-expression before '==' token
    6 |   for (int i == 12; i > 6; i++) {
      |              ^~
a.cc:6:26: error: expected ')' before ';' token
    6 |   for (int i == 12; i > 6; i++) {
      |       ~                  ^
      |                          )
a.cc:6:28: error: 'i' was not declared in this scope
    6 |   for (int i == 12; i > 6; i++) {
      |                            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string a;
  cin >> a;
  for (int i == 12; i < 6; i++) {
    a[i] = a[i - 1];
  }
  a[4] = ' ';
  cout << a;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: expected ';' before '==' token
    6 |   for (int i == 12; i < 6; i++) {
      |             ^~~
      |             ;
a.cc:6:14: error: expected primary-expression before '==' token
    6 |   for (int i == 12; i < 6; i++) {
      |              ^~
a.cc:6:26: error: expected ')' before ';' token
    6 |   for (int i == 12; i < 6; i++) {
      |       ~                  ^
      |                          )
a.cc:6:28: error: 'i' was not declared in this scope
    6 |   for (int i == 12; i < 6; i++) {
      |                            ^
Language: Java

s=input();print(s[:4]+" "+s[4:])

Compiler output:
Main.java:1: error: class, interface, enum, or record expected
s=input();print(s[:4]+" "+s[4:])
^
Main.java:1: error: class, interface, enum, or record expected
s=input();print(s[:4]+" "+s[4:])
          ^
2 errors
Language: C++

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

int main(){
  string a;
  cin>>a;
  for(int i=0;i<a.size();i++){
      cout<<a[i];
  if(i==3){
  cout<<" "
  }
    }
        cout<<endl;
      

}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: expected ';' before '}' token
   10 |   cout<<" "
      |            ^
      |            ;
   11 |   }
      |   ~