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

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n,a[100010],b[100010];
  cin>>n;
  for(int i=0;i<n;i++){
    cin>>a[i]; b[i]=a[i];
  }
  sort(b.begin(),b.end());
  for(int i=0;i<n;i++){
    if(a[i]==b[n-1])cout<<b[n-2]<<endl;
    else cout<<b[n-1]<<endl;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: request for member 'begin' in 'b', which is of non-class type 'int [100010]'
    9 |   sort(b.begin(),b.end());
      |          ^~~~~
a.cc:9:20: error: request for member 'end' in 'b', which is of non-class type 'int [100010]'
    9 |   sort(b.begin(),b.end());
      |                    ^~~
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for(int i=0; i<N; i++){
    cin >> A[i];
  }
  int buff;
  
  for(int i=0; i<N; i++){
    buff = A[i];
    A[i] = 1;
    int max = *max_element(A.begin(), A.end())
     cout << max << endl;
    A[i] = buff;
  } 
  
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:17:6: error: expected ',' or ';' before 'cout'
   17 |      cout << max << endl;
      |      ^~~~
Language: C++

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

#define MAX_N 200000
int N;
int A;

int main()
{
  int max1, max2 = -1, -2;
  int idx1, idx2 =  0,  0;
  cin >> N;
  for (int i = 0; i < N; i++) {
    cin >> A;
    if (A > max1) {
      max2 = max1;
      idx2 = idx1;
      max1 = A;
      idx1 = i;
    } else if (A > max2) {
      max2 = A;
      idx2 = i;
    }
  }

  for (int i = 0; i < N; i++) {
    if (i == idx1) {
      cout << max2 << endl;
    } else {
      cout << max1 << endl;
    }
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: expected unqualified-id before '-' token
   10 |   int max1, max2 = -1, -2;
      |                        ^
a.cc:11:25: error: expected unqualified-id before numeric constant
   11 |   int idx1, idx2 =  0,  0;
      |                         ^
Language: C++

#include <iostream>
#include <vector>
#include <cstdio>
#include <string>
#include <algorithm>
#include <cmath>
using namespace std;
typedef unsigned long ulint;
const int mod = 2019;

int main() {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    for (int i = 0; i < n; i++)
    {
                    int tmp = 0;
        for (int j = 0; j < n; j++)
        {

            if (j != i)
            {
                tmp = max(tmp, a[j]);
            }
        }
        cout << tmp << endl;
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:31:6: error: expected '}' at end of input
   31 |     }
      |      ^
a.cc:11:12: note: to match this '{'
   11 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define PB push_back
#define MP make_pair
#define pri 1000000007
#define all(x) x.begin(),x.end()
#define mx 32
using namespace std;

void masterstroke(){
ll n;
cin>>n;
ll x;
vector <ll> ans;
for(ll i=0;i<n;i++){
	cin>>x;
	ans.PB(x);
}
  sort(all(ans));
ll e=ans.size();
ll f1=ans[e-1];
ll f2=ans[e-2];
for(ll i=0;i<n;i++){
	if(a[i]==f1){cout<<f2<<endl;}
	else cout<<f1<<endl;
}


}


int main() {
	ll t=1;
	//cin>>t;
	for(ll i=0;i<t;i++)masterstroke();
	
	// your code goes here
	return 0;
}

Compiler output:
a.cc: In function 'void masterstroke()':
a.cc:26:12: error: 'a' was not declared in this scope
   26 |         if(a[i]==f1){cout<<f2<<endl;}
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a[200010],max1,max2;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        if(a[i]>=max1)max2=max1,max1=a[i];
        else if(a[i]>max2)max2=a[i];
    }
    for(int i=1;i<=n;i++)
        if(a[i]==max1)cout<<max2<<endl;else cout<<max1<<endl;
    return 0;
}#include<bits/stdc++.h>
using namespace std;
int n,a[200010],max1,max2;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        if(a[i]>=max1)max2=max1,max1=a[i];
        else if(a[i]>max2)max2=a[i];
    }
    for(int i=1;i<=n;i++)
        if(a[i]==max1)cout<<max2<<endl;else cout<<max1<<endl;
    return 0;
}

Compiler output:
a.cc:16:2: error: stray '#' in program
   16 | }#include<bits/stdc++.h>
      |  ^
a.cc:16:3: error: 'include' does not name a type
   16 | }#include<bits/stdc++.h>
      |   ^~~~~~~
a.cc:18:5: error: redefinition of 'int n'
   18 | int n,a[200010],max1,max2;
      |     ^
a.cc:3:5: note: 'int n' previously declared here
    3 | int n,a[200010],max1,max2;
      |     ^
a.cc:18:7: error: redefinition of 'int a [200010]'
   18 | int n,a[200010],max1,max2;
      |       ^
a.cc:3:7: note: 'int a [200010]' previously declared here
    3 | int n,a[200010],max1,max2;
      |       ^
a.cc:18:17: error: redefinition of 'int max1'
   18 | int n,a[200010],max1,max2;
      |                 ^~~~
a.cc:3:17: note: 'int max1' previously declared here
    3 | int n,a[200010],max1,max2;
      |                 ^~~~
a.cc:18:22: error: redefinition of 'int max2'
   18 | int n,a[200010],max1,max2;
      |                      ^~~~
a.cc:3:22: note: 'int max2' previously declared here
    3 | int n,a[200010],max1,max2;
      |                      ^~~~
a.cc:19:5: error: redefinition of 'int main()'
   19 | int main()
      |     ^~~~
a.cc:4:5: note: 'int main()' previously defined here
    4 | int main()
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
#define me(a,x) memset(a,x,sizeof(a))
#define sc scanf
#define itn int
using namespace std;
const int N=1e6;
const long long mod=1e9+7;
const int oo=0x7fffffff;
const int sup=0x80000000;
typedef long long ll;
typedef unsigned long long ull;
template <typename it>void db(it *begin,it *end){while(begin!=end)cout<<(*begin++)<<" ";puts("");}
template <typename it>
string to_str(it n){string s="";while(n)s+=n%10+'0',n/=10;reverse(s.begin(),s.end());return s;}
template <typename it>int o(it a){cout<<a<<endl;return 0;}
ll mul(ll a,ll b,ll c){ll ans=0;for(;b;b>>=1,a=(a+a)%c)if(b&1)ans=(ans+a)%c;return ans;}
ll ksm(ll a,ll b,ll c){ll ans=1;for(;b;b>>=1,a=mul(a,a,c))if(b&1)ans=mul(ans,a,c);return ans;}
int n;
int a[N];
int pre[N]={0},suf[N]={0};
int main(){
	/freopen("in.txt","r",stdin);
	cin>>n;
	for(itn i=1;i<=n;i++)cin>>a[i];
	for(itn i=1;i<=n;i++){
		pre[i]=max(pre[i-1],a[i]);
	}
	for(int i=n;i>=1;i--)suf[i]=max(suf[i+1],a[i]);
	for(int i=1;i<=n;i++){
		o(max(pre[i-1],suf[i+1]));
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:9: error: expected primary-expression before '/' token
   22 |         /freopen("in.txt","r",stdin);
      |         ^
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
  int n;cin>>n;
  vector<int> a;
  vector<int> b;
  for(int i = 0; n > i; i++){
    int tmp;cin>>tmp;
    b.push_back(tmp);
    a.push_back(tmp);
  }
  sort(a.begin(),a.end(),Greater<int>());
  for(int i = 0; n > i; i++){
    if(b[i]!=a[0]){
      cout << a[0] << endl;
    }else{
      cout << a[1] << endl;
    }
  }
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:14:26: error: 'Greater' was not declared in this scope
   14 |   sort(a.begin(),a.end(),Greater<int>());
      |                          ^~~~~~~
a.cc:14:34: error: expected primary-expression before 'int'
   14 |   sort(a.begin(),a.end(),Greater<int>());
      |                                  ^~~
Language: C++

#include <iostream>
#include <ostream>
#include <vector>
#include <cmath>

using namespace std;

vector<int> enumerate_divisors(int n, bool sorted = false, bool reverse = false) {
  vector<int> ret;
  int i = floor(sqrt(n));
  if (i * i == n) {
    ret.push_back(i);
    --i;
  }
  while (i) {
    if (n % i == 0) {
      ret.push_back(i);
      ret.push_back(n / i);
    }
    i--;
  }

  if (sorted) {
    if (reverse) {
      sort(ret.begin(), ret.end(), greater<>());
    } else {
      sort(ret.begin(), ret.end());
    }
  }
  return ret;
}


int main() {
  int N, M{};
  cin >> N;
  vector<int> a(N), b(N+1);

  for (int i = 1; i <= N; ++i) {
    cin >> a[i];
  }
  for (int i = N; i; --i) {
    if(a[i] == b[i]) continue;
    for (int d : enumerate_divisors(i)) {
      b[d] = !b[d];
    }
    M += b[i];
  }

  cout << M << endl;
  if (!M) return 0;
  for (int i = 1; i <= N; i++) {
    if (!b[i]) continue;
    if (!M) {
      cout << " ";
      M = 0;
    }
    cout << i;
  }
  cout << endl;
}


Compiler output:
a.cc: In function 'std::vector<int> enumerate_divisors(int, bool, bool)':
a.cc:25:7: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   25 |       sort(ret.begin(), ret.end(), greater<>());
      |       ^~~~
      |       sqrt
a.cc:27:7: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   27 |       sort(ret.begin(), ret.end());
      |       ^~~~
      |       sqrt
Language: C++

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

int main(){
    int n;cin>>N;
    int a[n+1];
    a[0]=0;
    vector<int>v;
    for(int i=1;i<=n;i++)cin>>a[i];
    int b[n+1];
    for(int i=0;i<=n;i++)b[i]=0;

    for(int i=n;i>=1;i++){
        int mol=n/i;
        int sum=0;
        for(int j=1;j<=mol;j++){
            sum+=b[j*i];
        }
        if(sum%2!=a[i]){b[i]=1;v.push_back(i);}
    }
    cout << v.size()<<endl;
    for(int i=0;i<v.size();i++)cout << v[i]<<endl;


    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: 'N' was not declared in this scope
    6 |     int n;cin>>N;
      |                ^
Language: C++

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

int main(){
    int n;cin>>N;
    int a[n+1];
    a[0]=0;
    vector<int>v;
    for(int i=1;i<=n;i++)cin>>a[i];
    int b[n+1];
    for(int i=0;i<=n;i++)b[i]=0;

    for(int i=n;i>=1;i++){
        int mol=n/i;
        int sum=0;
        for(int j=1;j<=mol;j++){
            sum+=b[j*i];
        }
        if(sum%2!=a[i]){b[i]=1;v.push_back(i)}
    }
    cout << v.size()<<endl;
    for(int i=0;i<v.size();i++)cout << v[i]<<endl;


    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: 'N' was not declared in this scope
    6 |     int n;cin>>N;
      |                ^
a.cc:20:46: error: expected ';' before '}' token
   20 |         if(sum%2!=a[i]){b[i]=1;v.push_back(i)}
      |                                              ^
      |                                              ;
Language: C++

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

typedef long long ll;
typedef long double ld;
typedef vector<vector<int>> Graph;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
#define pi 3.14159265359
#define inf 2147483647
#define INF 9223372036854775807
#define mod 1000000007
#define mod2 998244353

int main() {
	int N; cin >> N;
	vector<int> a(N);
	for(int i = 0; i < N; i++) cin >> a[i];
	set<int> b;
	for(int i = N; i > 0; i--) {
		int sum = 0;
		for(int j = i + i; j < N; j += i) {
			if(b.count(j)) sum++;
		}
		if(sum % 2 != a[i - 1]) b.insert(i);
		else {
			M = -1;
			break;
		}
	}
	if(M == -1) {
		cout << M << endl;
		return 0;
	}
	int M = b.size();
	int cnt = 0;
	cout << M << endl;
	for(auto p: b) {
		cnt++;
		if(cnt == b.size()) {
			cout << p << endl;
			return 0;
		}
		cout << p << " ";
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:25: error: 'M' was not declared in this scope
   27 |                         M = -1;
      |                         ^
a.cc:31:12: error: 'M' was not declared in this scope
   31 |         if(M == -1) {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(void){
    // Your code here!
    int n;
    cin >> n;
    vector<int> a(n+1);
    for (int i=1; i<n+1; i++) cin >> a[i];
    
    vector<int> ans(n+1);
    vector<int> b;
    
    for (int i=n; i>0; i--){
        if(i * 2 < n+1) ans[i] += ans[i*2];
        
        if(ans[i] % 2 == a[i]){}
        else {ans[i] += 1; b.push_back(i);}
    }
    cout << b.size() << endl;
    reverse(b.bigin(), b.end());
    for (int x: b) cout << x << endl;
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:15: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   20 |     reverse(b.bigin(), b.end());
      |               ^~~~~
      |               begin
Language: C++

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
typedef long long ll;
int main(){
  int N,i,j;scanf("%d",&N);
  int a[N+1],ans[N+1],sum;
  for(i=1;i<=N;i++) scanf("%d",&a[i]);
  for(i=N;i>=1;i--){
    sum = 0;
    for(j=i+i;j<=N;j+=i) sum += ans[j];
    ans[i] = sum^a[i];
  }
  printf("%d\n",accumulate(ans+1,ans+N+1,0));
  for(i=1;i<=N;i++){
    if(ans[i]) printf("%d ",i);
  }
  printf("\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: 'scanf' was not declared in this scope
    7 |   int N,i,j;scanf("%d",&N);
      |             ^~~~~
a.cc:15:17: error: 'accumulate' was not declared in this scope
   15 |   printf("%d\n",accumulate(ans+1,ans+N+1,0));
      |                 ^~~~~~~~~~
a.cc:15:3: error: 'printf' was not declared in this scope
   15 |   printf("%d\n",accumulate(ans+1,ans+N+1,0));
      |   ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | #pragma GCC target("avx2")
Language: C++

#include <iostream>
#include <stdio.h>
#include <vector>
using namespace std;

int n;
bool exist = true;
vector<int> v;

int main (){
	cin>> n;
	for(int i=0;i<n;i++) {
		int x;
		cin >> x;
		v.push_back(x);
		if(i>0 && x) exist = false;
	}
	if (!exist) cout <<'-1'<<endl;
	else if ( v[0] ) cout << '1' << endl<<'1'<<endl;
	else cout << 0 <<endl;
	return 0;
	

Compiler output:
a.cc:18:28: warning: multi-character character constant [-Wmultichar]
   18 |         if (!exist) cout <<'-1'<<endl;
      |                            ^~~~
a.cc: In function 'int main()':
a.cc:21:18: error: expected '}' at end of input
   21 |         return 0;
      |                  ^
a.cc:10:12: note: to match this '{'
   10 | int main (){
      |            ^
Language: C++

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

int main() {

	int n; cin >> n;
	vector<int> a(n + 1, 0);
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	vector<int> ans(n + 1, 0);
	int cnt = 0;
	for (int i = n; i >= 1 ; i--) {
		int tmpSum = 0;
		for (int j = i + i; j <= n; j += i) {
			tmpSum += a[j];
		}
		if (tmpSum % 2 != a[i]) {
			ans[i] = 1;
			cnt++;
		}
	}
	vector<int> b;
	for (int i = 1; i <= n; i++) {
		if(ans[i]) b.push_back(i)
	}
	cout << b.size() << endl;
	for (int i = 0; i < b.size(); i++) {
		cout << b[i] << " ";
	}
	cout << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:42: error: expected ';' before '}' token
   26 |                 if(ans[i]) b.push_back(i)
      |                                          ^
      |                                          ;
   27 |         }
      |         ~
Language: C++

#include<bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
typedef long long ll;
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REP(i,num,n) for(int i=num, i##_len=(n); i<i##_len; ++i)
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; }
#define print(x) (cout << (x) << endl)
#define pb push_back
#define mp make_pair
#define sz(x) int(x.size())
template<class T> inline void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
#define fs first
#define sc second

const int INF = 1e9;
const ll LLINF = 1e16;
const ll MOD = 1e9+7;
template<class T> inline void add(T &a, T b){a = ((a+b) % MOD + MOD) % MOD;};

template<typename T>
vector<T> make_v(size_t a){return vector<T>(a);}
 
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
 

// 指定した文字cが文字列に何文字入ってるか
ll stringcount(string s, char c) {
    return count(s.cbegin(), s.cend(), c);
}


// 割り算の切り上げ処理
template<typename T>
T rp(T a, T b) {
  return (a + b - 1) / b;
}

// 桁和
template<typename T>
T digsum(T n) {
    T res = 0;
    while(n > 0) {
        res += n%10;
        n /= 10;
    }
    return res;
}

// 回文判定
bool kai (string s) {
    string t{s};
    reverse(begin(t), end(t));
    return s == t;
}

using pint = pair<int, int>;
using pll = pair<ll, ll>;


int main(void)
{
    cout.tie(0);
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll n;
    cin >> n;
    vector<ll> a(n);
    rep(i, n) cin >> a[i];
    vector<ll> box(n);
    set<ll> ans;
    for(int i = n - 1; i >= 0; --i){
        ll num = i + 1;
        ll sum = 0;
        for(int j = num + num; j < n; j += num){
            sum += box[j - 1];
        }
        if(sum % 2 != a[i]){
            box[i] = 1;
            ans.push_back(i + 1);
        }
    }
    print(ans.size());
    if(ans.size()){
        rep(i, sz(ans)){
            print(ans[i]);
        }
    }

}



Compiler output:
a.cc: In function 'int main()':
a.cc:87:17: error: 'class std::set<long long int>' has no member named 'push_back'
   87 |             ans.push_back(i + 1);
      |                 ^~~~~~~~~
a.cc:93:22: error: no match for 'operator[]' (operand types are 'std::set<long long int>' and 'int')
   93 |             print(ans[i]);
      |                      ^
a.cc:11:28: note: in definition of macro 'print'
   11 | #define print(x) (cout << (x) << endl)
      |                            ^
Language: C++

#include<bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
typedef long long ll;
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define REP(i,num,n) for(int i=num, i##_len=(n); i<i##_len; ++i)
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; }
#define print(x) (cout << (x) << endl)
#define pb push_back
#define mp make_pair
#define sz(x) int(x.size())
template<class T> inline void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
#define fs first
#define sc second

const int INF = 1e9;
const ll LLINF = 1e16;
const ll MOD = 1e9+7;
template<class T> inline void add(T &a, T b){a = ((a+b) % MOD + MOD) % MOD;};

template<typename T>
vector<T> make_v(size_t a){return vector<T>(a);}
 
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
 

// 指定した文字cが文字列に何文字入ってるか
ll stringcount(string s, char c) {
    return count(s.cbegin(), s.cend(), c);
}


// 割り算の切り上げ処理
template<typename T>
T rp(T a, T b) {
  return (a + b - 1) / b;
}

// 桁和
template<typename T>
T digsum(T n) {
    T res = 0;
    while(n > 0) {
        res += n%10;
        n /= 10;
    }
    return res;
}

// 回文判定
bool kai (string s) {
    string t{s};
    reverse(begin(t), end(t));
    return s == t;
}

using pint = pair<int, int>;
using pll = pair<ll, ll>;


int main(void)
{
    cout.tie(0);
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    ll n;
    cin >> n;
    vector<ll> a(n);
    rep(i, n) cin >> a[i];
    vector<ll> box(n);
    set<ll> ans;
    for(int i = n - 1; i >= 0; --i){
        ll num = i + 1;
        ll sum = 0;
        for(int j = num + num; j < n; j += num){
            sum += box[j - 1];
        }
        if(sum % 2 != a[i]){
            box[i] = 1;
            ans.(i + 1);
        }
    }
    print(ans.size());
    if(ans.size()){
        rep(i, sz(ans)){
            print(ans[i]);
        }
    }

}


Compiler output:
a.cc: In function 'int main()':
a.cc:87:17: error: expected unqualified-id before '(' token
   87 |             ans.(i + 1);
      |                 ^
a.cc:93:22: error: no match for 'operator[]' (operand types are 'std::set<long long int>' and 'int')
   93 |             print(ans[i]);
      |                      ^
a.cc:11:28: note: in definition of macro 'print'
   11 | #define print(x) (cout << (x) << endl)
      |                            ^
Language: C++

int main() {
    int N;
    cin >> N;
    vector<int> a(N + 1);
    vector<bool> b(N + 1, false);
    for (int i = 1; i <= N; i++) {
        cin >> a[i];
    }
    int res = 0;
    for (int i = N; i > 0; i--) {
        int cnt = 0;
        for (int j = 1; j < N / i + 1; j++) {
            cnt += b[i * j];
        }
        if (cnt % 2 != a[i]) {
            b[i] = true;
            res++;
        }
    }
    cout << res << endl;
    for (int i = 1; i <= N; i++) {
        if (b[i]) {
            cout << i << " ";
        }
    }
    cout << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin >> N;
      |     ^~~
a.cc:4:5: error: 'vector' was not declared in this scope
    4 |     vector<int> a(N + 1);
      |     ^~~~~~
a.cc:4:12: error: expected primary-expression before 'int'
    4 |     vector<int> a(N + 1);
      |            ^~~
a.cc:5:12: error: expected primary-expression before 'bool'
    5 |     vector<bool> b(N + 1, false);
      |            ^~~~
a.cc:7:16: error: 'a' was not declared in this scope
    7 |         cin >> a[i];
      |                ^
a.cc:13:20: error: 'b' was not declared in this scope
   13 |             cnt += b[i * j];
      |                    ^
a.cc:15:24: error: 'a' was not declared in this scope
   15 |         if (cnt % 2 != a[i]) {
      |                        ^
a.cc:16:13: error: 'b' was not declared in this scope
   16 |             b[i] = true;
      |             ^
a.cc:20:5: error: 'cout' was not declared in this scope
   20 |     cout << res << endl;
      |     ^~~~
a.cc:20:20: error: 'endl' was not declared in this scope
   20 |     cout << res << endl;
      |                    ^~~~
a.cc:22:13: error: 'b' was not declared in this scope
   22 |         if (b[i]) {
      |             ^
Language: C++

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

int n;

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
    cin >> n;
    int dp[n + 1], placed[n + 1];
    for (int i = 1; i <= n; i++) {
		cin >> dp[i];
		placed[i] = 0;
	}
    
    vector<int> ans;
    for (int i = n; i >= 1; --i) {
		int sum = 0;
		for (int j = 2 * i; j <= n; j += i) sum	+= placed[j];
		sum %= 2;
		if (sum != dp[i]) {
			placed[i] = true;
			ans.push_back(i);
		}
	}
	
	bool pos = true;
    for (int i = 1; i <= n; ++i) {
		int sum = 0;
		for (int j = i; j <= n; j += i) sum	+= placed[j];
		sum %= 2;
		if (sum != dp[i]) pos = false
	}	
	
	if (pos) cout << -1;
	else {
		cout << ans.size() << "\n";
		for (auto& i : ans) cout << i;
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:46: error: expected ';' before '}' token
   32 |                 if (sum != dp[i]) pos = false
      |                                              ^
      |                                              ;
   33 |         }
      |         ~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
using ll = long long;
using P  = pair<int,int>;
using v  = vector<int>;
using vv = vector<v>;
const int MOD = 1000000007;

int main(){
    int n;
    cin >> n;
    v a(n+1);
    
    for(int i=0; i<n; i++){
        cin >> a[i+1];
    }
    
    v b(n+1);
    
    for(int i=n; i>0; i--){
        if(a[i]==b[i]%2)continue;
        
        b[i]++;
        
        if(i!=1)b[1]++;
        
        for(int j=2; j*j<=i; j++){
            if(i%j)continue;
            
            if(i/j!=j)b[i/j]++;
            b[j]++;
        }
    }
    
    int count = 0;
    for(int i=1; i<=n; i++){
        if(b[i]%2)
            count++;
    }
    cout << c.size() << endl;
    
    if(c.size()){
        for(int i=0; i<c.size(); i++){
            cout << c[i];
            if(i==c.size()-1)
                cout << endl;
            else
                cout << " ";
        }
    }
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:13: error: 'c' was not declared in this scope
   41 |     cout << c.size() << endl;
      |             ^
Language: C++

#include "bits/stdc++.h"
#define int long long
#define rep(i, n)           for (int i = 0; i < (int)(n); i++)
#define REP(i, a, b)        for (int i = (int)(a); i < (int)(b); i++)
#define FOR(i, a)           for (auto &i : a)
#define ALL(obj)            begin(obj), end(obj)
#define MAX(x)              *max_element(ALL(x))
#define MIN(x)              *min_element(ALL(x))
#define LOWER_BOUND(A, key) distance(A.begin(), lower_bound(ALL(A), key))
#define UPPER_BOUND(A, key) distance(A.begin(), upper_bound(ALL(A), key))
#define Endl                endl

using namespace std;
const int MOD   = (int)(1e9 + 7);
const int INF   = (int)(1e13 + 7);
const double PI = acos(-1);

int CEIL(int a, int b) { return (a >= 0 ? (a + (b - 1)) / b : (a - (b - 1)) / b); } //ceil() for int
int mod(int a, int b) { return a >= 0 ? a % b : a - (b * CEIL(a, b)); }             //always return positive num
int pow(int x, int y) {                                                             //return x^y in order(log(y))
  if (x == 0) return 0;
  if (y == 0) return 1;
  int ans   = 1;
  int digit = (int)((log((double)y) / log((double)2) / 1 + 1));
  x %= MOD;
  for (int i = 0; i < digit; i++) {
    if (((y >> i) & 1u) == 1) ans = ans * x % MOD;
    x = x * x % MOD;
  }
  return ans;
}
template <class T>
void cumulative_sum(T &container) {
  for (int i = 0; i < container.size() - 1; i++) container[i + 1] += container[i];
}

class DPreparingBoxes {
public:
  static void solve(istream &cin, ostream &cout) {
    int N;
    cin >> N;
    vector<int> a(N);
    rep(i, N) cin >> a[i];
    vector<int> ball(N, 0);
    for (int i = N - 1; i >= 0; i--) {
      int now = 0;
      for (int j = i; j < N; j += (i + 1)) {
        now += ball[j];
      }
      if (now % 2 != a[i]) {
        ball[i] = 1;
      }
    }
    cout << accumulate(ALL(ball), 0LL) << endl;
    rep(i, N) {
      if (ball[i]) {
        cout << a[i];
        if (i != N - 1) {
          cout << " ";
        }
      }
    }
    if (accumulate(ALL(ball), 0LL) > 0)
      cout << endl;
  }
};


Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>

int main()
{
  cout << "-1" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    5 |   cout << "-1" << endl;
      |   ^~~~
      |   std::cout
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:5:19: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 |   cout << "-1" << endl;
      |                   ^~~~
      |                   std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long int
#define rep(i, n) for(int i = 0; i < n; i++)
#define repp(i, n) for(int i = 1; i <= n; i++)
#define sort(v) sort((v).begin(), (v).end())
#define pb push_back
#define mp make_pair
#define all(a) (a).begin(),(a).end()
#define riverse(v) reverse((v).begin(), (v).end())
using vi = vector<int>;
using vs = vector<string>;
using vvi = vector<vi>;
using vll = vector<ll>;
const ll MOD = 1e9+7;
vi alphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m',
               'n','o','p','q','r','s','t','u','v','w','x','y','z'};
int main() {
    int n;
    cin >> n;
    vi a(n + 1);
    repp(i, n)cin >> a[i];
    vb ans(n + 1, false);
    for (int i = n; i >= 1;i--) {
        int k = n / i;
        int sum = 0;
        while (k > 1) {
            if (ans[i * k]) sum++;
            k--;
        }
        if (sum % 2 != a[i]) ans[i] = true;
    }
    int count = 0;
    repp(i, n) {
        if (ans[i])count++;
    }
    cout << count << endl;
    repp(i, n) {
        if (ans[i])cout << i << " ";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:5: error: 'vb' was not declared in this scope; did you mean 'vs'?
   24 |     vb ans(n + 1, false);
      |     ^~
      |     vs
a.cc:29:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   29 |             if (ans[i * k]) sum++;
      |                 ^~~
      |                 abs
a.cc:32:30: error: 'ans' was not declared in this scope; did you mean 'abs'?
   32 |         if (sum % 2 != a[i]) ans[i] = true;
      |                              ^~~
      |                              abs
a.cc:36:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   36 |         if (ans[i])count++;
      |             ^~~
      |             abs
a.cc:40:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   40 |         if (ans[i])cout << i << " ";
      |             ^~~
      |             abs
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long int
#define rep(i, n) for(int i = 0; i < n; i++)
#define repp(i, n) for(int i = 1; i <= n; i++)
#define sort(v) sort((v).begin(), (v).end())
#define pb push_back
#define mp make_pair
#define all(a) (a).begin(),(a).end()
#define riverse(v) reverse((v).begin(), (v).end())
using vi = vector<int>;
using vs = vector<string>;
using vvi = vector<vi>;
using vll = vector<ll>;
const ll MOD = 1e9+7;
vi alphabet = {'a','b','c','d','e','f','g','h','i','j','k','l','m',
               'n','o','p','q','r','s','t','u','v','w','x','y','z'};

int main() {
	int n;
  	cin >> n;
  	vi a(n+1);
  	repp(i,n)cin>>a[i];
  	vb ans(n+1,false);
  	rep(i,n){
    	int k=n/i;
      	int sum=0;
      	while(k>1){
        	if(ans[i*k])sum++;
          	k--;
        }
      	if(sum%2!=a[i])ans[i]=true;
    }
  	int count=0;
  	repp(i,n){
    	if(ans[i])count++;
    }
  	cout << count <<endl;
  	repp(i,n){
    	if(ans[i])cout << i << " ";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:9: error: 'vb' was not declared in this scope; did you mean 'vs'?
   25 |         vb ans(n+1,false);
      |         ^~
      |         vs
a.cc:30:20: error: 'ans' was not declared in this scope; did you mean 'abs'?
   30 |                 if(ans[i*k])sum++;
      |                    ^~~
      |                    abs
a.cc:33:24: error: 'ans' was not declared in this scope; did you mean 'abs'?
   33 |         if(sum%2!=a[i])ans[i]=true;
      |                        ^~~
      |                        abs
a.cc:37:12: error: 'ans' was not declared in this scope; did you mean 'abs'?
   37 |         if(ans[i])count++;
      |            ^~~
      |            abs
a.cc:41:12: error: 'ans' was not declared in this scope; did you mean 'abs'?
   41 |         if(ans[i])cout << i << " ";
      |            ^~~
      |            abs
Language: C++

#include <algorithm>
#include <array>
#include <bitset>
#include <chrono>
#include <climits>
#include <cmath>
#include <deque>
#include <iostream>
#include <locale>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#if __cplusplus > 201703L
#include <bit>
#endif

using i32 = int32_t;
using i64 = uint64_t;
using u32 = uint32_t;
using u64 = uint64_t;

template <typename T>
T input_value() {
  T result;
  std::cin >> result;
  return result;
}

template <typename T1, typename T2>
void input_multival_to_array(const T1& n, T2& array) {
  for (T1 i = T1(0); i < n; ++i) {
    array.emplace_back(input_value<T2::value_type>());
  }
}

template <typename T>
std::set<T> factorize(const T& n) {
  const T sqrtn = T(sqrt(double(n)));
  std::set<T> result = {T(1), T{n}};
  for (T i = T(2); i <= sqrtn; ++i) {
    if (n % i == T(0)) {
      result.insert(i);
      result.insert(n / i);
    }
  }
}

int main() {
  using namespace std;
  locale::global(locale(""));
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  const auto n = input_value<u32>();
  vector<bool> mul_modulos;
  mul_modulos.reserve(n);
  input_multival_to_array(n, mul_modulos);
  u32 kakutei_min = n / 2 + 1;
  for (u32 i = kakutei_min - 1; i != 0; --i) {
    for (u32 j = 2; i * j <= n; ++j) {
      mul_modulos[i - 1] = mul_modulos[i - 1] != mul_modulos[i * j - 1];
    }
  }
  set<u32> result;
  for (u32 i = 1; i <= n; ++i) {
    if (mul_modulos[i - 1]) result.insert(i);
  }
  cout << result.size() << '\n';
  for (auto it = result.begin(); it != result.end(); ++it) {
    if (it != result.begin()) cout << ' ';
    cout << *it;
  }
  if (!result.empty()) cout << '\n';
  return 0;
}

Compiler output:
a.cc: In instantiation of 'void input_multival_to_array(const T1&, T2&) [with T1 = unsigned int; T2 = std::vector<bool>]':
a.cc:62:26:   required from here
   62 |   input_multival_to_array(n, mul_modulos);
      |   ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
a.cc:38:40: error: dependent-name 'T2::value_type' is parsed as a non-type, but instantiation yields a type
   38 |     array.emplace_back(input_value<T2::value_type>());
      |                                        ^~~~~~~~~~
a.cc:38:40: note: say 'typename T2::value_type' if a type is meant
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> P;

int main(void){
  int n; cin >> n;
  int a[n]; rep(i,n) cin >> a[i+1];
  int ans[n];
  ans[n] = a[n];
  if(a[n] == 1) count++;
  int count = 0;
  for(int i = n-1; i >= 1; i--){
    int check = 0;
    int j = 2;
    while(j*i <= n){
      if(ans[j*i] == 1) check++;
      j++;
    }
    if(check % 2 == 1){
      if(a[i] ==  1){
        ans[i] = 0;
      }
      else{
        ans[i] = 1;
        count++;
      }
    }
    else{
      if(a[i] == 1){
        ans[i] = 1;
        count++;
      }
      else ans[i] = 0;
    }
  }
  cout << count << endl;
  rep(i,n){
    if(ans[i+1] != 0) cout << i+1 << " ";
  }
  cout << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:22: error: no post-increment operator for type
   12 |   if(a[n] == 1) count++;
      |                      ^~
Language: C++

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

int main() {
  long long n,sum=0, mod=2019;
  cin>>n;
  vector<bool> vec(n+1,0);
  vector<bool> ans;
  int a[n+1];
  for(int i=1; i<=n; i++){
    cin>>a[i];
  }
  for(int i=n; i>=1; i--){
    int j=i;
    sum=0;
    while(j+i<=n){
      j+=i;
      sum+=vec[j];
    }
    if(sum%2!=a[i]){
      vec[i]=1;
      ans.push_back(i);
    }
  }
  
  cout<<ans.size()<<endl;
  
  for(int i=0 i<ans.size(); i--)
    cout<<ans[i]<<endl;
  
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:14: error: expected ';' before 'i'
   29 |   for(int i=0 i<ans.size(); i--)
      |              ^~
      |              ;
Language: C++

#include<bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
using namespace std;
typedef long long ll;
ll gcd(ll a,ll b){return b!=0?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a*b/gcd(a,b);}

int main(){
    ll n,a,cnt=0;
    vector<bool> ball(n,0);
    for(i=n-1;i>=0;i--){
        ll now=i+1,sum=0;
        while(1){
            now+=i+1;
            if(now>n) break;
            sum+=ball[now];
        }
        cin>>a;
        if(sum%2!=a){
            ball[i+1]=1;
            cnt++;
        }
    }
    cout<<cnt<<endl;
    rep(i,n) if(ball[i]) cout<<i<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'i' was not declared in this scope
   12 |     for(i=n-1;i>=0;i--){
      |         ^
a.cc:17:13: error: 'sum' was not declared in this scope
   17 |             sum+=ball[now];
      |             ^~~
a.cc:20:12: error: 'sum' was not declared in this scope
   20 |         if(sum%2!=a){
      |            ^~~
Language: C++

#include<bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
using namespace std;
typedef long long ll;
ll gcd(ll a,ll b){return b!=0?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a*b/gcd(a,b);}

int main(){
    ll n,a,cnt=0;
    bool ball(n,0);
    for(i=n-1;i>=0;i--){
        ll now=i+1,sum=0;
        while(1){
            now+=i+1;
            if(now>n) break;
            sum+=ball[now];
        }
        cin>>a;
        if(sum%2!=a){
            ball[i+1]=1;
            cnt++;
        }
    }
    cout<<cnt<<endl;
    rep(i,n) if(ball[i]) cout<<i<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:18: error: expression list treated as compound expression in initializer [-fpermissive]
   11 |     bool ball(n,0);
      |                  ^
a.cc:12:9: error: 'i' was not declared in this scope
   12 |     for(i=n-1;i>=0;i--){
      |         ^
a.cc:17:13: error: 'sum' was not declared in this scope
   17 |             sum+=ball[now];
      |             ^~~
a.cc:17:22: error: invalid types 'bool[ll {aka long long int}]' for array subscript
   17 |             sum+=ball[now];
      |                      ^
a.cc:20:12: error: 'sum' was not declared in this scope
   20 |         if(sum%2!=a){
      |            ^~~
a.cc:26:21: error: invalid types 'bool[ll {aka long long int}]' for array subscript
   26 |     rep(i,n) if(ball[i]) cout<<i<<endl;
      |                     ^
Language: C++

#include <cstdio>
#include <cstring>
#include <cmath>
#include <utility>
#include <iostream>
#include <functional>
#include <bitset>
#include <algorithm>
#include <vector>
#include <forward_list>
#include <set>
#include <map>
#include <queue>
#include <deque>
#include <stack>
#define ll long long int
#define rep(i,n) for(int i=0;i<(n);i++)
using namespace std;
int mx4[] = {0,1,0,-1};
int my4[] = {1,0,-1,0};


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


int main(){
    int n; cin >> n;
    vector<int> a(2*n),b(2*n);
    rep(i,n) cin >> a[i];

    for(int i=n-1;i > n/2 - 1;i--){
        if(a[i] == 0) b[i] = 0;
        else b[i] = 1;
    }
    for(int i=n/2-1;i>-1;i--){
        int I = i + 1,check = 0;
        while(I + i + 1 =< n){
            I += i+1;
            check += b[I-1];
        }
        if(check % 2 == 1 && a[i] == 0) b[i] = 1;
        else if(check % 2 == 0 && a[i] == 1) b[i] = 1;
    }

    int ans = 0;
    rep(i,n){
        if(b[i] == 1) ans++;
    }
    cout << ans << endl;
    rep(i,n){
        if(b[i] == 1){
            cout << i+1 << " ";
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:26: error: expected primary-expression before '<' token
   37 |         while(I + i + 1 =< n){
      |                          ^
Language: C++

using namespace std;
using ll = long long;
using P = pair<int,int>;

int main(){
    int n; cin >> n;
    vector<int> a(n),b(n);
    rep(i,n) cin >> a[i];
    int ans = 0;
    for(int i = n-1; i >= 0; i--){
        int sum = 0;
        for(int j = 2;j <= n/(i+1);++j){
            sum += a[j*(i+1)-1];
        }
        if(abs(a[i]-sum) % 2 == 0) b[i] = 0;
        else {
            b[i] = 1;
            ans++;
        }
    }
    cout << ans << endl;
    rep(i,n) if(b[i] == 1) cout << i+1 << endl;
}

Compiler output:
a.cc:3:11: error: 'pair' does not name a type
    3 | using P = pair<int,int>;
      |           ^~~~
a.cc: In function 'int main()':
a.cc:6:12: error: 'cin' was not declared in this scope
    6 |     int n; cin >> n;
      |            ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:7:5: error: 'vector' was not declared in this scope
    7 |     vector<int> a(n),b(n);
      |     ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | using namespace std;
a.cc:7:12: error: expected primary-expression before 'int'
    7 |     vector<int> a(n),b(n);
      |            ^~~
a.cc:8:9: error: 'i' was not declared in this scope
    8 |     rep(i,n) cin >> a[i];
      |         ^
a.cc:8:5: error: 'rep' was not declared in this scope
    8 |     rep(i,n) cin >> a[i];
      |     ^~~
a.cc:13:20: error: 'a' was not declared in this scope
   13 |             sum += a[j*(i+1)-1];
      |                    ^
a.cc:15:16: error: 'a' was not declared in this scope
   15 |         if(abs(a[i]-sum) % 2 == 0) b[i] = 0;
      |                ^
a.cc:15:12: error: 'abs' was not declared in this scope; did you mean 'ans'?
   15 |         if(abs(a[i]-sum) % 2 == 0) b[i] = 0;
      |            ^~~
      |            ans
a.cc:15:36: error: 'b' was not declared in this scope
   15 |         if(abs(a[i]-sum) % 2 == 0) b[i] = 0;
      |                                    ^
a.cc:17:13: error: 'b' was not declared in this scope
   17 |             b[i] = 1;
      |             ^
a.cc:21:5: error: 'cout' was not declared in this scope
   21 |     cout << ans << endl;
      |     ^~~~
a.cc:21:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:21:20: error: 'endl' was not declared in this scope
   21 |     cout << ans << endl;
      |                    ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

int N, A[201010], B[201010];
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N;
    rep(i, 1, N + 1) cin >> A[i];

    rrep(i, N, 1) {
        int other = 0;
        for (int x = i * 2; x <= N; x += i) if (B[x]) other++;
        if (other % 2 != A[i]) B[i] = 1;
    }

    vector<int> ans;
    rep(i, 1, N + 1) if (B[i]) ans.push_back(i);

    int M = ans.size();
    printf("%d\n", M);
    rep(i, 0, M) {
        if(i) printf(" ");
        printf("%d", ans[i]);
    }
    printf("\n");
}

Compiler output:
a.cc: In function 'void _main()':
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> N;
      |     ^~~
a.cc:5:9: error: 'i' was not declared in this scope
    5 |     rep(i, 1, N + 1) cin >> A[i];
      |         ^
a.cc:5:5: error: 'rep' was not declared in this scope
    5 |     rep(i, 1, N + 1) cin >> A[i];
      |     ^~~
a.cc:7:5: error: 'rrep' was not declared in this scope
    7 |     rrep(i, N, 1) {
      |     ^~~~
a.cc:13:5: error: 'vector' was not declared in this scope
   13 |     vector<int> ans;
      |     ^~~~~~
a.cc:13:12: error: expected primary-expression before 'int'
   13 |     vector<int> ans;
      |            ^~~
a.cc:16:13: error: 'ans' was not declared in this scope
   16 |     int M = ans.size();
      |             ^~~
a.cc:17:5: error: 'printf' was not declared in this scope
   17 |     printf("%d\n", M);
      |     ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | int N, A[201010], B[201010];
Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <cmath>
#include <cctype>
#include <cstdlib>
#include <stack>
#include <queue>
#include <vector>
#include <algorithm>
#include <list>
#include<set>
#include<map>
using namespace std;

int main() {
	int n, a[200001] = {};
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	vector<int> v;
	for (int i = n; i > 0; i--) {
		int s = 0;
		for (int j = 1; j <= n / i; j++) {
			s += a[i * j];
		}
		if (s%2==1) {
			v.push_back(i);
		}
	}
	cout << v.size() << endl;
	for (int i = 0; i <v.size(); i++) {
		cout << v[v.size-i-1] << " ";
	}
	cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:29: error: invalid use of member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]' (did you forget the '()' ?)
   34 |                 cout << v[v.size-i-1] << " ";
      |                           ~~^~~~
      |                                 ()
Language: Java

import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      int[] arr = new int[n+1];
      for(int i = 1; i <= n; i++)
        arr[i] = sc.nextInt();
      int[] res = new int[n+1];
      int resCnt = 0;
      for(int i = n; i > 0; i--) {
        int cnt = 0;
        for(int j = i*2; j <= n; j += i)
          if(res[j] == 1) cnt++;
        if(cnt % 2 != arr[j]) {
          res[i] = 1;
          resCnt++;
        }
      }
      System.out.println(resCnt);
      if(resCnt != 0)
      for(int i = 1; i <= n; i++)
        if(res[i] > 0)
            System.out.print(res[i] + " ");
  }
}

Compiler output:
Main.java:16: error: cannot find symbol
        if(cnt % 2 != arr[j]) {
                          ^
  symbol:   variable j
  location: class Main
1 error
Language: C++



int main(){
    long long int N;
    int a[200002],b[200002];
    for(int i=0;i<200002;i++)
        b[i] = 0;
    cin >> N;
    for(int i=0;i<N;i++)
        cin >> a[i+1];

    for(int i=N;i>=1;i--){
        int kari=0;
        for(int j=i;j<=N;j+=i){
            kari += b[j];
        }
        if(kari % 2 != a[i]){
            b[i] = 1;
        }
    }
    int cnt=0;
    for(int i=1;i<=N;i++){
        cnt += b[i];
    }

    cout << cnt << endl;
    for(int i=1;i<=N;i++){
        if(b[i])
            cout << (i) << " ";
    }
    cout << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope
    8 |     cin >> N;
      |     ^~~
a.cc:26:5: error: 'cout' was not declared in this scope
   26 |     cout << cnt << endl;
      |     ^~~~
a.cc:26:20: error: 'endl' was not declared in this scope
   26 |     cout << cnt << endl;
      |                    ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef vector<ll> vl;
typedef pair<ll, ll> PP;
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define CIN>>x scanf("%lld",&x);
#define all(v) v.begin(), v.end()
bool chmin(ll & a, ll  b) { if (b < a) { a = b; return 1; } return 0; }
bool chmax(ll & a, ll b) { if (b > a) { a = b; return 1; } return 0; }
const ll INF = 999999999999999;
const ll MOD = 1000000007;
const ll MAX_N=500010;
ll a, b, c, d, e, f, p, t, x, y, z, q, m, n, r, h, k, w, l, ans;
int main() {
    cin >> n;
	vl A,B(n,0),C;
	rep(i,n){
		cin>>x;
		A.push_back(x);
	}

	for(ll i=n;i>0;i--){
		a=A[i-1];
		for(ll j=1;j*i<=n;j++){
			a+=B[i*j-1];
		}

		if(a%2==1)B[i-1]++;
	}
	

	rep(i,n){
		if(B[i]==1)C.push_back(i+1)
	}

	cout<<C.size()<<endl;

	rep(i,C.size()){
		cout<<C[i]<<" ";
	}

	cout<<endl;
}


Compiler output:
a.cc:7:9: warning: ISO C++11 requires whitespace after the macro name
    7 | #define CIN>>x scanf("%lld",&x);
      |         ^~~
a.cc: In function 'int main()':
a.cc:34:44: error: expected ';' before '}' token
   34 |                 if(B[i]==1)C.push_back(i+1)
      |                                            ^
      |                                            ;
   35 |         }
      |         ~