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

#include<iostream>
#include<iomanip>
#include<vector>
#include<string>
#include<cstring>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<climits>
#include<fstream>

#define MOD (1000000007)

using namespace std;

typedef long long int Int;

constexpr Int TEN(int n) { return n == 0 ? 1 : 10 * TEN(n-1); }

const int max_n = 200000+10;
int N;
int A[max_n];
int B[max_n];

int main(void) {
    cin>>N;
    
    for(int i = 1;i <= N;i++) {
        cin>>A[i];
    }
    for(int i = N;i >= 1;i--) {
        for(int j = 1;j*i <= N;j++) {
            if(i*(j+1) > N)
                break;
            if( (B[i*j]+B[i*(j+1)]) % 2 != A[i*j]) {
                B[i*j] = 1;
            }
        }
    }

    bool check = true;
    for(int i = 1;i <= N;i++) {
        for(int j = 1;j*i <= N;j*=i) {
            if((B[j*i]+B[(j+1)*i]) % 2 != A[j*i]) {
                check = false;
            }
            if(i == 1)
                j++;
        }
    }

    if(check == false) {
        cout<<-1<<endl;
    } else {
        int M;
        vector<int> C;
        for(int i = 1;i <= N;i++) {
            if(B[i] == 1) {
                C.push_back(i);
                M++;
            }
        }
        cout<<M<<endl;
        for(auto d:C) {
            cout<<d<<" ";
        }
        if (d.size() > 1)
            cout<<endl;
    }

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:72:13: error: 'd' was not declared in this scope
   72 |         if (d.size() > 1)
      |             ^
Language: C++

//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
using namespace std;
const int INF= 1e9+5;
typedef long long ll;
typedef long long int;

//約数の列挙O(√n)
vector<int>divisor(int n){
  vector<int>res;
  for(int i=1;i*i<=n;i++){
    if(n%i==0){
      res.push_back(i);
      if(i != n/i) res.push_back(n/i);
    }
  }
  return res;
}

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

Compiler output:
a.cc:7:19: error: declaration does not declare anything [-fpermissive]
    7 | typedef long long int;
      |                   ^~~
a.cc:21:1: error: '::main' must return 'int'
   21 | void main(){
      | ^~~~
Language: C++

//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
using namespace std;
const int INF= 1e9+5;
typedef long long ll;
typedef long long int;

//約数の列挙O(√n)
vector<int>divisor(int n){
  vector<int>res;
  for(int i=1;i*i<=n;i++){
    if(n%i==0){
      res.push_back(i);
      if(i != n/i) res.push_back(n/i);
    }
  }
  return res;
}

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

Compiler output:
a.cc:7:19: error: declaration does not declare anything [-fpermissive]
    7 | typedef long long int;
      |                   ^~~
a.cc:21:1: error: 'solve' does not name a type
   21 | solve main(){
      | ^~~~~
Language: C

#include <bits/stdc++.h>
#define rep(i,n) for(int64_t i=0;i < (int64_t)(n);i++)
#define invrep(i,n) for(int64_t i=n-1;i >= 0;i--)
using namespace std;

//////全探索したいときに開けよ////////
vector<vector<int>> fspattern;
vector<int> fspattern_draft;
int fspcnt = 0;

void setfspattern_core(int floor,int number,int degree){
  if(floor==degree){
    fspattern.at(fspcnt) = fspattern_draft;
    fspcnt++;
  }else{
    rep(i,number){
      fspattern_draft.at(floor) = i;
      setfspattern_core(floor+1,number,degree);
    }
  }
}

void setfspattern(int number,int degree){
  fspcnt = 0;
  int64_t array_num = 1;
  rep(i,degree){
    array_num *= number;
  }
  fspattern = vector<vector<int>>(array_num,vector<int>(degree));
  fspattern_draft = vector<int>(degree);
  setfspattern_core(0,number,degree);
}

//////nCrのmodを求めたいときに開けよ/////////
//int64_t univMod = 1000000007;
//int64_t factnum = 100000
//vector<int64_t> modfact(factnum);
//vector<int64_t> modinvfact(factnum);

/*void setmodfact(){
  for(int i=0;i<factnum;i++){
    if(i == 0){
      modfact.at(i) = 1;
    }else{
      modfact.at(i) = (modfact.at(i-1)*i)%univMod;
    }
  }
}

int64_t calcmodpower(int64_t a,int64_t n){
  int64_t res = 1;
  while(n != 0){
    if(n & 1){
      res = (res * a) % univMod;
    }
    a = (a*a) % univMod;
    n = n >> 1;
  }
  return res;
}

int64_t calcinverse(int64_t n){
	return calcmodpower(n,univMod-2);
}

void setmodinvfact(){
  for(int i=0;i<factnum;i++){
    if(i==0){
      modinvfact.at(i) = 1;
    }else{
      modinvfact.at(i) = calcmodpower(modfact.at(i),univMod-2);
    }
  }
}*/


/*
int64_t calcGCD(int64_t a,int64_t b){
	int64_t p = a;
	int64_t q = b;
	int64_t c = a%b;
	while(c != 0){
		p = q;
		q = c;
		c = p%q;
	}
	return q;
}
*/

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i,n){
    cin >> a[i];
  }
  vector<int> res(n);
  int m = 0;
  invrep(i,n){
    int k = 0;
    int cnt = 0;
    for(int j=i;j < n;j = j + (i + 1)){
      if(res[j] == 1){
        cnt++;
      }
    }
    res[i] = (a[i] + cnt) % 2;
    m += res[i];
  }
  cout << m << endl;
  rep(i,n){
    if(res[i] == 1){
      cout << i+1 << " ";
    }
  }
      
      
    
  
  
  

  
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: Java

import java.util.Scanner;
public class ABC134D {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n+1];
		int[] b = new int[n+1];
		int count = 0;
		int ans = 0;
		a[0] = 0;
		for (int i = 1; i <= n; i++) a[i] = sc.nextInt();
		for (int i = n; i >= 1; i--) {
			for (int j = 2; j*i <= n; j++) {
				if(b[i*j]==1) count++;
			}
			if(count%2!=a[i]) {
				b[i] = 1;
				ans++;
			}
			count = 0;
		}
		System.out.println(ans);
		StringBuilder sb = new StringBuilder();
		for (int i = 1; i <= n; i++) {
			if(b[i] == 1) sb.append(String.valueOf(i)+' ');
		}
		System.out.println(new String(sb));
	}
}

Compiler output:
Main.java:2: error: class ABC134D is public, should be declared in a file named ABC134D.java
public class ABC134D {
       ^
1 error
Language: C++

    #include<iostream>
    #include<stdio.h>
    //#include <bits/stdc++.h>
    #include<vector>
    #include<float.h>
    #include<iomanip>
    #include<algorithm>
    #include<string>
    #include<cstring>
    #include<math.h>
    #include<cmath>
    #include<sstream>
    #include<set>
    #include<map>
    #include<queue>
    #include <cassert>
    #include <cmath>

    #define INF 1e9
    #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 VEC(type, c, n) std::vector<type> c(n);for(auto& i:c)std::cin>>i;
    #define vec(type,n) vector<type>(n)
    #define vvec(m,n) vector<vector<int>> (int(m),vector<int>(n))

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

    int main(){
      int n;cin>>n;
      auto a = vec(int,n+1);
      REP(i,1,n){
          else cin>>a[i];
      }
      auto b = vec(int,n+1);
      int i = n;
      int sum = 0;
      while(i){
          if(n<2*i)b[i] = a[i];
          else if(n>=2*i && i>1){
              int memo = 0,j = 2;
              while(n>=i*j){
                  memo += b[i*j];
                  j++;
              }
              b[i] = (memo+a[i])%2;
          }
          else b[1] = (a[1]+sum)%2;
          sum += b[i];
          i--;
      }
      cout<<sum<<endl;
      REP(i,1,n)if(b[i])cout<<i<<" ";
    }
    


Compiler output:
a.cc: In function 'int main()':
a.cc:35:11: error: 'else' without a previous 'if'
   35 |           else cin>>a[i];
      |           ^~~~
Language: C++

int main(){
    using namespace std;
    int N; cin >> N;
    vector<int> A(N);
    vector<int> ans(N, 0);
    for (int i = 0; i < N; i++) cin >> A[i];

    int ans_c =0;
    for (int i = N; i >=1; i--) {
        int cnt = 0;
        for (int j = i; j <= N; j++)
        {
            if(i%j==0 && ans[j-1]==1) cnt++;
        }
        if(cnt%2 != A[i-1]){
            ans[i-1] = 1;
            ans_c++;
        }    
    }
    cout << ans_c << endl;
    for (int i = 0; i < ans.size(); i++)
    {
        if(ans[i]==1){
            cout << i+1;
            if(i!=ans.size()-1) cout << " ";
            else cout << endl; 
        }
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:3:12: error: 'cin' was not declared in this scope
    3 |     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 | int main(){
a.cc:4:5: error: 'vector' was not declared in this scope
    4 |     vector<int> A(N);
      |     ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | int main(){
a.cc:4:12: error: expected primary-expression before 'int'
    4 |     vector<int> A(N);
      |            ^~~
a.cc:5:12: error: expected primary-expression before 'int'
    5 |     vector<int> ans(N, 0);
      |            ^~~
a.cc:6:40: error: 'A' was not declared in this scope
    6 |     for (int i = 0; i < N; i++) cin >> A[i];
      |                                        ^
a.cc:13:26: error: 'ans' was not declared in this scope
   13 |             if(i%j==0 && ans[j-1]==1) cnt++;
      |                          ^~~
a.cc:15:21: error: 'A' was not declared in this scope
   15 |         if(cnt%2 != A[i-1]){
      |                     ^
a.cc:16:13: error: 'ans' was not declared in this scope
   16 |             ans[i-1] = 1;
      |             ^~~
a.cc:20:5: error: 'cout' was not declared in this scope
   20 |     cout << ans_c << endl;
      |     ^~~~
a.cc:20:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:20:22: error: 'endl' was not declared in this scope
   20 |     cout << ans_c << endl;
      |                      ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | int main(){
a.cc:21:25: error: 'ans' was not declared in this scope; did you mean 'ans_c'?
   21 |     for (int i = 0; i < ans.size(); i++)
      |                         ^~~
      |                         ans_c
Language: Java

 class Main {
	 static int mod =  (int) (Math.pow(10,9)+7);
    public static void main(String[] args) {
    	
        Scanner sc = new Scanner(System.in);
        int N= sc.nextInt();
        int[] a = new int[N];
        int[] b = new int[N];
        int M = 0;
        int k = 0;
		for(int i=0;i<N;i++){
			a[i]=sc.nextInt();
		}
		for(int i=N;i>0;i--) {
			int sum=0;
			for(int j=i;j<N+1;j=j+i) {
				if(a[j-1]==1) {
					sum++;
				}
			}
//	        System.out.println(sum);
			if(sum%2==1) {
//		        System.out.println(i);
		        b[M]=i;
				M++;
			}
		}
		
        System.out.println(M);
		StringBuilder sb = new StringBuilder();
		for(int i=M-1;i>-1;i--) {
			if(i==0) {
				sb.append(b[i]);
			} else {
				sb.append(b[i]);				
				sb.append(" ");
			}
		}
        System.out.println(sb);
    }
}

Compiler output:
Main.java:5: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:5: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

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

typedef long long ll;
const int mod = 1e9 + 7;

ll N;
vector<ll> a;

int main() {
    cin >> N;
    a.resize(N + 1);
    rep(i, N) cin >> a[i + 1];

    vector<ll> ans(N + 1);
    vector<ll> b(N + 1);

    for (int i = N; i >= 1; i--) {
        ll sum = 0;
        for (int j = i + i; j <= N; j += i) {
            sum ^= b[j]; 
        }
        b[i] = sum^a[i];
    }

    vector<ll> ans;
    for (ll i = 1; i <= N; i++) {
        if (b[i] == 1) {
            ans.push_back(i + 1);
        }
    }

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

Compiler output:
a.cc: In function 'int main()':
a.cc:28:16: error: redeclaration of 'std::vector<long long int> ans'
   28 |     vector<ll> ans;
      |                ^~~
a.cc:17:16: note: 'std::vector<long long int> ans' previously declared here
   17 |     vector<ll> ans(N + 1);
      |                ^~~
Language: Java

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Stream;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.nextLine());
    int[] a = Stream.of(sc.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    sc.close();
    int
    int[] ans = new int[n];
    for(int i = n-1; i >= 0; i--){
        int tmp = a[i];
        for(int j = 2; j <= n; j++){
            if((i+1)*j >= n){
                break;
            }else{
                tmp += a[(i+1)*j-1];
            }
        }
        ans[i] = tmp%2;
    }
    for(int i = 0; i < n; i++){
        System.out.println(ans[i]);
    }
  }
}

Compiler output:
Main.java:12: error: not a statement
    int
    ^
Main.java:12: error: ';' expected
    int
       ^
2 errors
Language: C++

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

int main()
{
	int n,ans=0;
	bool check=true;
	cin>>n;
	int a[n]={};
	vector<int> b;
	for(int i = 1; i <= n; i++)
	{
		cin>>a[i];
	}
	for(int i = n; i >=  1; i--)
	{
		int tem = i;
		int sum = 0; 
		int j = 1;
		while(tem < n)
		{
			
			sum+=a[tem];
			j++;
			tem=i*j;
			// cout<<i<<" sum: "<<sum<<"\n";
		}
		if(  ( sum % 2 == 1 && a[i]  == 1 )  ||  ( sum % 2 == 0 && a[i]  == 0 ) )
		{
			ans++;
			a[i]++;
			b.push_back(i);
			
		}
		// else if (  )
		// {
		// 	check = true;
		// }
		else
		{
			// cout << " break at " << i<<"\n";
			// cout << "sum: "<< sum << " has:" << a[i];
			check = false;
			break
		}
		// for(int j=1;j<=n;j++)
		// 	cout<<a[j]<<" ";
		// cout<<"\n";
	}
	if(check)
	{
		cout<<ans<<"\n";
		for(unsigned int i = 0 ; i < b.size(); i++)
			cout<<b[i]<<" ";
	}
	else
		cout<<-1<<"\n";

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:30: error: expected ';' before '}' token
   44 |                         break
      |                              ^
      |                              ;
   45 |                 }
      |                 ~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	
	int N, a;
	vector<int> vec;
	
	cin >> N;
	for (int i = 1; i <= N; i++)
	{
		cin >> a;
		
		if (a) vec.emplace_back(i);
	}//for i
	
	if (vec.empty())
	{
		cout << "0\n"
		return 0;
	}//if
	
	if (vec[0] != 1)
	{
		cout << "-1\n";
		return 0;
	}//if
	
	int mx = vec.back();
	for (int x : vec)
	{
		if (mx % x)
		{
			cout << "-1\n";
			return 0;
		}//if
	}//for x
	
	cout << "1\n"
		 << mx;
	
	return 0;
}//main

Compiler output:
a.cc: In function 'int main()':
a.cc:23:30: error: expected ';' before 'return'
   23 |                 cout << "0\n"
      |                              ^
      |                              ;
   24 |                 return 0;
      |                 ~~~~~~
Language: C++

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

int main(){
  int n;cin >> n;
  vector<int> a(n);
  vector<int> ans(n);
  for(int i=0; i<n; i++){
    cin >> a.at(i);
  }
  int ball=0;
  for(int i=n; 0<i; i--){
    if(0==a.at(i-1)){
      ans.at(i-1)=0;
      int total = 0;
      for(int j=i*2; j<=n; j +=i){
        if(ans.at(j)==1)total++;
      }
      if(total%2==1){cout << -1 << endl;return 0;}
    }else{
      int total = 0;
      for(int j=i*2; j<=n; j += i){
        if(ans.at(j)==1)total++;
      }
      if(total%2==0){ans.at(i-1)=1;ball++;}
      else ans.at(i-1)=0;
    }
  }
  
  
        
    

Compiler output:
a.cc: In function 'int main()':
a.cc:28:4: error: expected '}' at end of input
   28 |   }
      |    ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> a(n+1);
  vector<int> b(n+1);
  a[0]=0;
  b[0]=0;
  for(int i=1;i<n+1;i++){
    cin >> a[i];
  }
  for(int i=n;i>=1;i--){
    if(i==n){
      b[i]=a[i];
      continue;
    }
    int sum=0;
    for(int j=i+i;j<=n;j+=i){
      sum+=a[j];
    }
    b[i]=(sum+a[i])%2;
    if(b[i]){
      cnt++;
    }
  }
  cout << cnt << endl;
  for(int i=1;i<n+1;i++){
    if(b[i]){
      cout << i << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:7: error: 'cnt' was not declared in this scope; did you mean 'int'?
   26 |       cnt++;
      |       ^~~
      |       int
a.cc:29:11: error: 'cnt' was not declared in this scope; did you mean 'int'?
   29 |   cout << cnt << endl;
      |           ^~~
      |           int
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> a(n+1);
  vector<int> b(n+1);
  a[0]=0;
  b[0]=0;
  
  for(int i=1;i<n+1;i++){
    cin >> a[i];
    
  }
  int cnt=0;
  for(int i=n;i>=1;i--){
    int sum=0;
    if(i==n){
      b[i]=a[i];
    for(int j=i+1;j<=n;j++){
      sum+=b[j];
    }
    b[i]=(sum+a[i])%2;
    if(b[i]==1){
      cnt++;
    }
  }
  cout << cnt << endl;
  for(int i=1;i<n+1;i++){
    if(b[i]){
      cout << i << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:36:2: error: expected '}' at end of input
   36 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> a(n+1);
  vector<int> b(n+1);
  a[0]=0;
  b[0]=0;
  
  for(int i=1;i<n+1;i++){
    cin >> a[i];
    
  }
  int cnt=0;
  for(int i=n;i>=1;i--){
    int sum=0;
    if(i==n){
      b[i]=a[i];
    for(int j=i+1;j<=n;j++){
      sum+=b[j];
    }
    b[i]=(sum+a[i])%2;
    if(b[i]==1){
      cnt++;
    }
  }
  cout << cnt << endl;
  for(int i=1;i<n+1;i++){
    if(b[i]){
      cout << i << endl;
    }
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:2: error: expected '}' at end of input
   36 | }
      |  ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main(void) {
    int N;
    cin >> N;
    vector<int> a(N+1);
    for(int i=1; i<=N; i++) {
        cin >> a.at(i);
    }
    vector<int> b(N+1);
    for(int i=N; i; i--) {
        b.at(i) = a.at(i);
        for(int j=2; i*j<=N; j++) {
            if(b.at(i*j) == 1) {
                b.at(i) = 1 - b.at(i);
            }
        }
    }
    int M = accumulate(b.begin(), b.end(), 0);
    cout << M << endl;
    for(int i=1; i<=N; i++) {
        if(b.at(i) == 1) {
            cout << i << " " << endl;
        }
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:13: error: 'accumulate' was not declared in this scope
   23 |     int M = accumulate(b.begin(), b.end(), 0);
      |             ^~~~~~~~~~
Language: C++

 
typedef pair<int, int> pii;
typedef long long ll;
template<class T> using V = vector<T>;
template<class T> using VV = V<V<T>>;
 
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define ALL(c) (c).begin(),(c).end()
#define dump(x) cout << #x << " = " << (x) << endl
constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n-1); }
 
template<class T, class U> void chmin(T& t, const U& u) { if (t > u) t = u; }
template<class T, class U> void chmax(T& t, const U& u) { if (t < u) t = u; }
 
template<class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os<<"("<<p.first<<","<<p.second<<")";
    return os;
}
 
template<class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os<<"{";
    rep(i, v.size()) {
        if (i) os<<",";
        os<<v[i];
    }
    os<<"}";
    return os;
}
 
const int maxn = 200010;
bool f[maxn];
 
int main() {
    int N; cin >> N;
    for (int i = 1; i <= N; ++i) {
        int x; cin >> x;
        f[i] = x;
    }
    V<int> ans;
    for (int i = N; i >= 1; --i) {
        for (int j = i * 2; j <= N; j += i) {
            f[i] ^= f[j];
        }
        if (f[i]) ans.pb(i);
    }
    cout << ans.size() << endl;
    rep(i, ans.size()) cout << ans[i] << (i + 1 == ans.size() ? "\n" : " ");
 
    return 0;
}

Compiler output:
a.cc:2:9: error: 'pair' does not name a type
    2 | typedef pair<int, int> pii;
      |         ^~~~
a.cc:4:29: error: 'vector' does not name a type
    4 | template<class T> using V = vector<T>;
      |                             ^~~~~~
a.cc:5:30: error: 'V' does not name a type
    5 | template<class T> using VV = V<V<T>>;
      |                              ^
a.cc:22:1: error: 'ostream' does not name a type
   22 | ostream& operator<<(ostream& os, const pair<T, U>& p) {
      | ^~~~~~~
a.cc:28:1: error: 'ostream' does not name a type
   28 | ostream& operator<<(ostream& os, const vector<T>& v) {
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:42:12: error: 'cin' was not declared in this scope
   42 |     int N; cin >> N;
      |            ^~~
a.cc:47:5: error: 'V' was not declared in this scope
   47 |     V<int> ans;
      |     ^
a.cc:47:7: error: expected primary-expression before 'int'
   47 |     V<int> ans;
      |       ^~~
a.cc:52:19: error: 'ans' was not declared in this scope
   52 |         if (f[i]) ans.pb(i);
      |                   ^~~
a.cc:54:5: error: 'cout' was not declared in this scope
   54 |     cout << ans.size() << endl;
      |     ^~~~
a.cc:54:13: error: 'ans' was not declared in this scope
   54 |     cout << ans.size() << endl;
      |             ^~~
a.cc:54:27: error: 'endl' was not declared in this scope
   54 |     cout << ans.size() << endl;
      |                           ^~~~
Language: C++

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

int main(int argc, char *argv[]){
  int N,M;
  cin>>N;
  vector<int> A(N+1,0);
  vector<int> B(N,0);
  int a;
  vector<int> memo(N+1,0);
  for(int i=1; i<N+1; i++){
    cin>>a;
    A[i]=a;
  }
  int count=0;
  for(int i=N; i>0; i--){
    if(i==1){
     
      if(memo[i]%2==A[i]) continue;
      else{
	memo[i]++;
	B.push_back(i);
	count++;
	if(memo[i]%2!=A[i]){
	  cout<<-1<<endl;
	  return 0;
      }
    }
    else{
      
      int sum=0;
      for(int j=i; j<N+1; j+=i){
	if(j%i==0){
	  sum+=memo[j];
	}
      }
      if(sum%2==A[i]) continue;
      else{
	memo[i]++;
	B.push_back(i);
	count++;
	if(memo[i]%2!=A[i]){
	  cout<<-1<<endl;
	  return 0;
	}
      }
    }
  
  }
  
  cout<<count<<endl;
  for(int i=N; i>0; i++){
   
    if(B[i]==0) break;
    else{
      cout<<B[i]<<" ";
    }
  }



}
      


Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:30:5: error: expected '}' before 'else'
   30 |     else{
      |     ^~~~
a.cc:18:13: note: to match this '{'
   18 |     if(i==1){
      |             ^
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(n+1);
  rep(i,n) cin >> a[i+1];
  vector<int> b(n+1);
  
  for(int i=n;i>=1;i==){
    int sum = 0;
    for(int j=i+i;j<=n;j+=i){
      sum ^= b[j];
    }
    b[i] = sum^a[i];
  }
  vector<int> ans;
  for(int i=1;i<=n;i++){
    if(b[i]) ans.push_back(b[i]);
  }
  
  int s = ans.size();
  
  rep(i,s){
    printf("%d%c",ans[i],i+1==ans.size() ? "\n" : " ");
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:23: error: expected primary-expression before ')' token
   13 |   for(int i=n;i>=1;i==){
      |                       ^
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  vector<int> ans(n);
  
  for(int i=n-1;i<=0;i--){
    int b = 0;
    for(int j=i;j<n;j=j+j){
      b ^= j;
    }
    ans[i] = a[i]^b;
  }
  rep(i,n) printf("%d%c",ans[i],i==n-1 ? "\n" : " ");
}

Compiler output:
a.cc:2:2: error: invalid preprocessing directive #deifne; did you mean #define?
    2 | #deifne rep(i,n) for(int i=0;i<n;i++)
      |  ^~~~~~
      |  define
a.cc: In function 'int main()':
a.cc:10:7: error: 'i' was not declared in this scope
   10 |   rep(i,n) cin >> a[i];
      |       ^
a.cc:10:3: error: 'rep' was not declared in this scope
   10 |   rep(i,n) cin >> a[i];
      |   ^~~
Language: C++

#include <bits/stdc++.h>

#define mod 1000000007

#define rep(i, n) for(int i=0; i<n; ++i)

using namespace std;
typedef long long ll;
const long long INF = 1LL << 60;
 
int main(void){
	
	int N;
	
	cin >> N;
	
	vector<int> a(N + 1);
	
	rep(i, N)
		cin >> a[i + 1];
	
	int ans = 0;
	vector<int> b(N + 1);
	
	for(int i=N; i>0; i--){
		int count = 0;
		for(int j=i; j<=N; j+=i)
			count += a[j];
		b[i] = (a[i] + 2 - sum) % 2;
		ans += b[i];
	}
	
	cout << ans << endl;
	
	rep(i, N)
		if(b[i + 1] == 1)
			cout << i + 1 << " ";
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:36: error: 'sum' was not declared in this scope
   29 |                 b[i] = (a[i] + 2 - sum) % 2;
      |                                    ^~~
Language: C++

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

int main(){
    ll i,j,n;
    cin >> n;
    int a[n+1],b[n+1];
    vector <ll> data;
    ll count = 0;
    for(i = 1; i < n+1; i++){
        cin >> a[i];
    }

    for(i = n; i > 0; i--){
        ll ans = 0;
        for(j = 2 * i;j <= n; j += i){
            ans += a[j];
        }
        int hoge = ((ans  + a[i] ) % 2;
        if(hoge == 1){
            count += 1;
            data.push_back(i);
        }
    }
    cout << count << endl;
    for(i = 0; i < data.size();i++){
        cout << data[i] << " ";
    }
    cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:39: error: expected ')' before ';' token
   20 |         int hoge = ((ans  + a[i] ) % 2;
      |                    ~                  ^
      |                                       )
Language: C++

using namespace std;



int main (){
    int N;
    cin>>N;
    vector<int> A(N), B(N);
    for(int i=0; i<N; i++){
        cin>>A.at(i);
    }
    int Checker;
    for(int i=N-1; i>=0; i--){
        Checker=N/(i+1);
      	//cout<<Checker<<' ';
        int Sumofi=0;
        for(int j=2; j<=Checker; j++){
            Sumofi += B.at((i+1)*j-1);
           // Sumofi %= 2;
        }
      	//cout<<Sumofi<<endl;
        if((Sumofi+A.at(i))%2==0){
            B.at(i)=0;
          	
        }
        else{
            B.at(i)=1;
        }
    }
    int Sum=0;
    for(int i=0; i<N; i++){
        Sum+=B.at(i);
    }
    cout<<Sum<<endl;
  	bool Space=false;
    for(int i=0; i<N; i++){
        if(B.at(i)==1){
			if(!Space){
          		Space=true;
        	}
          	else{
            	cout<<' ';
         	}
          	cout<<i+1;
   	 	}
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'cin' was not declared in this scope
    7 |     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:8:5: error: 'vector' was not declared in this scope
    8 |     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:8:12: error: expected primary-expression before 'int'
    8 |     vector<int> A(N), B(N);
      |            ^~~
a.cc:10:14: error: 'A' was not declared in this scope
   10 |         cin>>A.at(i);
      |              ^
a.cc:18:23: error: 'B' was not declared in this scope
   18 |             Sumofi += B.at((i+1)*j-1);
      |                       ^
a.cc:22:20: error: 'A' was not declared in this scope
   22 |         if((Sumofi+A.at(i))%2==0){
      |                    ^
a.cc:23:13: error: 'B' was not declared in this scope
   23 |             B.at(i)=0;
      |             ^
a.cc:27:13: error: 'B' was not declared in this scope
   27 |             B.at(i)=1;
      |             ^
a.cc:32:14: error: 'B' was not declared in this scope
   32 |         Sum+=B.at(i);
      |              ^
a.cc:34:5: error: 'cout' was not declared in this scope
   34 |     cout<<Sum<<endl;
      |     ^~~~
a.cc:34:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:34:16: error: 'endl' was not declared in this scope
   34 |     cout<<Sum<<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;
a.cc:37:12: error: 'B' was not declared in this scope
   37 |         if(B.at(i)==1){
      |            ^
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repl(i,n) for(int64_t i=0;i<(int64_t)(n);i++)
#define MAX_N 10000000
#define ll int64_t
#define all(v) (v).begin(),(v).end()
using namespace std;

int main() {
    int n cin>>n;
    vector<int> a(n); vector<int> b(n,0);
    rep(i,n) cin>>a[i];

    for(int i=n-1;i>=0;i--) {        
        int count=0,sen=n;
        while(sen>=i) {
        if(i%sen==0) {
            count++;
            n--;
            }
        }
        b[i-1]==count;
    }
    int is=0;
    rep(i,n) {
        if(b[i]!=0) is++;
    }
    cout<<is<<endl;
    rep(i,n) {
        if(b[i]!=0) {
            cout<<b[i]<<" ";
        }
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: expected initializer before 'cin'
   10 |     int n cin>>n;
      |           ^~~
a.cc:11:19: error: 'n' was not declared in this scope
   11 |     vector<int> a(n); vector<int> b(n,0);
      |                   ^
Language: C++

#include <bits/stdc++.h>
#define rep(i,cc,n) for(int i=cc;i<=n;++i)
#define drep(i,cc,n) for(int i=cc;i>=n;--i)
#define sz(s) (int)(s.size())
#define vecprint(v) rep(i,0,v.size()-1)cout << v[i] << " ";cout << endl;
#define mod 1000000007
using namespace std;

vector<int> a;

void rev(int i){
    i++;
    for(j=1;j*j<=i;++j){
        if(i % j == 0){
            a[j-1] = a[j-1] == 1 ? 0 : 1;
        }
    }
}


int main(){
    int n,m=0;
    cin >> n;
    a.resize(n);
    vector<int> b;
    rep(i,0,n-1)cin >> a[i];

    drep(i,n-1,0){
        if(a[i]==1){
            rev(i);
            ++m;
            b.push_back(i+1);
        }
        // rep(j,0,n-1){
        //     cout << a[j] << " ";
        // }
        // cout << i << endl;
    }
    if(m==0){
        cout << 0 << endl;
    }else{
        cout << m << endl;
        rep(i,0,m-1){
            cout << b[i] << endl;
        }
    }
    return 0;
}

Compiler output:
a.cc: In function 'void rev(int)':
a.cc:13:9: error: 'j' was not declared in this scope
   13 |     for(j=1;j*j<=i;++j){
      |         ^
Language: C++

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

int main(){
    int N; cin >> N;
    vector<int> a(N);
    vector<bool> b(N);

    rep(i,N){
        cin >> a[i];
        b[i] = a[i];
    }

    for(int i=N-1; i >=0; i--){
        for(int j=2; j*i <=N; j++){
            b[i] += b[j*i];
        }
    }

    rep(i,N){
        b[i] = b[i]%2;
    }

    rep(i,N){
        m += b[i];
    }

    cout << m << endl;

    rep(i,N){

        if(b[i]){
            cout << i << " ";
        }
        
    }
    
}



Compiler output:
a.cc: In function 'int main()':
a.cc:19:18: error: no match for 'operator+=' (operand types are 'std::vector<bool>::reference' and 'std::vector<bool>::reference')
   19 |             b[i] += b[j*i];
      |             ~~~~~^~~~~~~~~
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(n+1);
  rep(i,n) cin >> a[i+1];
  vector<int> b(n+1);
  
  for(int i=n;i>=1;i--){
    int sum = 0;
    for(int j=i+i;j<=n;j+=i){
      sum ^= b[j];
    }
    b[i] = sum^a[i];
  }
  
  vector<int> ans(n);
  
  for(int i=1;i<=n;i++){
    if(b[i]) ans.push_back(i);
  }
  
  cout << ans.size() << endl;
  
  rep(i,ans.size()){
    printf("%d%c",ans[i],i+1==ans.size() ? \n :' ');
  }
}

Compiler output:
a.cc:29:44: error: stray '\' in program
   29 |     printf("%d%c",ans[i],i+1==ans.size() ? \n :' ');
      |                                            ^
Language: C++

#include <bits\stdc++.h>

#define NMAX 200100
#define INF 2000000000

#define MAX(a, b) (a > b ? a : b)
#define MIN(a, b) (a < b ? a : b)

typedef unsigned long long ull;
typedef long long int lli;

using namespace std;

// std::ifstream cin("f.in");
// std::ofstream cout("f.out");

int boxes[NMAX];
int a[NMAX];
int n;

int main()
{
    cin >> n;
    for(int i = 1; i <= n; i++)
        cin >> a[i];

    int count = 0;
    for(int i = n / 2 + 1; i <= n; i++)
        if(a[i])
        {
            boxes[i] = 1;
            count++;
        }
    for(int i = n / 2; i >= 1; i--)
    {
        int sumInd = 0;
        for(int j = i + i; j <= n; j += i)
            sumInd += boxes[j];
        
        if(sumInd % 2 != a[i])
        {
            count++;
            boxes[i] = 1;
        }
    }

    cout << count << '\n';
    for(int i = 1; i <= n; i++)
        if(boxes[i])
            cout << i << ' ';

    return 0;
}   

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

#include<iostream>
#include<cstdio>
#include<queue>
#include<vector>
#include<string.h>

using namespace std;

int N,a[200001],b[200001]={0};

int main()
{
  cin >> N;
  for(int i=1;i<N+1;i++)
  {
    cin >> a[i];
  }
  int m=0;
  for(int i=N;i>0;i--)
  {
      b[i]=a[i];
      for(int j=2;j*k<N+1;j++)
      {
        b[i]+=b[j*i];
      }
      b[i]=b[i]%2;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:22:21: error: 'k' was not declared in this scope
   22 |       for(int j=2;j*k<N+1;j++)
      |                     ^
Language: C++

include <bits/stdc++.h>
using namespace std;
int main(){
  cout << -1 << endl;
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'cout' was not declared in this scope
    4 |   cout << -1 << endl;
      |   ^~~~
a.cc:4:17: error: 'endl' was not declared in this scope
    4 |   cout << -1 << endl;
      |                 ^~~~
Language: C++

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

int main(){
  int N;
  cin >> N;
  int a[N],b[N];
  for(int i = 0; i < N; i++){
    cin >> a[i];
  }
  int count;
  for(int i = N-1; i >= 0; i--){
    count = 0;
    for(int j = 2; j*(i+1) < N; j++){
      if(b[j*(i+1)] == 1){
        count++;
      }
    }
    b[i] = (count - a[i]);
    if(b[i] < 0){
      b[i] = -b[i];
    }
    b[i] = b[i]%2;
  }
  for(int i = 0; i < N; i++){
    cout << b[i] << ' ' ;
  }
}

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

#include<iostream>
using namespace std;
#define ll long long
int main(){
  ll N,M=0;
  ll i,j;
  ll tmp;
  cin >> N;
  ll a[N+1],b[N+1];
  for(i=1;i<=N;i++){
    cin >> a[i];
    b[i]=0;
  }
  for(i=N;i>0;i--){
    tmp=0;
    j=i;
    while(tmp<=N){
      tmp=(tmp+b[j])%2;
      j+=i;
    }
    b[i]=(tmp+a[i])%2;
    if(b[i]==1)M++;
  }
  cout << M << endl;
  for(i=1;i<=N;i++){
    if(b[i]==1)cout << i << " ";
  }
  return 0
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:11: error: expected ';' before '}' token
   28 |   return 0
      |           ^
      |           ;
   29 | }
      | ~
Language: C++

#include<iostream>
using namespace std;
#define ll long long;
int main(){
  ll N,M=0;
  ll i,j;
  ll tmp;
  cin >> N;
  ll a[N+1],b[N+1];
  for(i=1;i<=N;i++){
    cin >> a[i];
    b[i]=0;
  }
  for(i=N;i>0;i--){
    tmp=0;
    j=i;
    while(tmp<=N){
      tmp=(tmp+b[j])%2;
      j+=i;
    }
    b[i]=(tmp+a[i])%2;
    if(b[i]==1)M++;
  }
  cout << M << endl;
  for(i=1;i<=N;i++){
    if(b[i]==1)cout << i << " ";
  }
  return 0
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:17: error: declaration does not declare anything [-fpermissive]
    3 | #define ll long long;
      |                 ^~~~
a.cc:5:3: note: in expansion of macro 'll'
    5 |   ll N,M=0;
      |   ^~
a.cc:5:6: error: 'N' was not declared in this scope
    5 |   ll N,M=0;
      |      ^
a.cc:5:8: error: 'M' was not declared in this scope
    5 |   ll N,M=0;
      |        ^
a.cc:3:17: error: declaration does not declare anything [-fpermissive]
    3 | #define ll long long;
      |                 ^~~~
a.cc:6:3: note: in expansion of macro 'll'
    6 |   ll i,j;
      |   ^~
a.cc:6:6: error: 'i' was not declared in this scope
    6 |   ll i,j;
      |      ^
a.cc:6:8: error: 'j' was not declared in this scope
    6 |   ll i,j;
      |        ^
a.cc:3:17: error: declaration does not declare anything [-fpermissive]
    3 | #define ll long long;
      |                 ^~~~
a.cc:7:3: note: in expansion of macro 'll'
    7 |   ll tmp;
      |   ^~
a.cc:7:6: error: 'tmp' was not declared in this scope; did you mean 'tm'?
    7 |   ll tmp;
      |      ^~~
      |      tm
a.cc:3:17: error: declaration does not declare anything [-fpermissive]
    3 | #define ll long long;
      |                 ^~~~
a.cc:9:3: note: in expansion of macro 'll'
    9 |   ll a[N+1],b[N+1];
      |   ^~
a.cc:9:6: error: 'a' was not declared in this scope
    9 |   ll a[N+1],b[N+1];
      |      ^
a.cc:9:13: error: 'b' was not declared in this scope
    9 |   ll a[N+1],b[N+1];
      |             ^
a.cc:28:11: error: expected ';' before '}' token
   28 |   return 0
      |           ^
      |           ;
   29 | }
      | ~
Language: C++

#include<iostream>
using namespace std;
#define ll;
int main(){
  ll N,M=0;
  ll i,j;
  ll tmp;
  cin >> N;
  ll a[N+1],b[N+1];
  for(i=1;i<=N;i++){
    cin >> a[i];
    b[i]=0;
  }
  for(i=N;i>0;i--){
    tmp=0;
    j=i;
    while(tmp<=N){
      tmp=(tmp+b[j])%2;
      j+=i;
    }
    b[i]=(tmp+a[i])%2;
    if(b[i]==1)M++;
  }
  cout << M << endl;
  for(i=1;i<=N;i++){
    if(b[i]==1)cout << i << " ";
  }
  return 0
}

Compiler output:
a.cc:3:9: warning: ISO C++11 requires whitespace after the macro name
    3 | #define ll;
      |         ^~
a.cc: In function 'int main()':
a.cc:5:6: error: 'N' was not declared in this scope
    5 |   ll N,M=0;
      |      ^
a.cc:5:8: error: 'M' was not declared in this scope
    5 |   ll N,M=0;
      |        ^
a.cc:6:6: error: 'i' was not declared in this scope
    6 |   ll i,j;
      |      ^
a.cc:6:8: error: 'j' was not declared in this scope
    6 |   ll i,j;
      |        ^
a.cc:7:6: error: 'tmp' was not declared in this scope; did you mean 'tm'?
    7 |   ll tmp;
      |      ^~~
      |      tm
a.cc:9:6: error: 'a' was not declared in this scope
    9 |   ll a[N+1],b[N+1];
      |      ^
a.cc:9:13: error: 'b' was not declared in this scope
    9 |   ll a[N+1],b[N+1];
      |             ^
a.cc:28:11: error: expected ';' before '}' token
   28 |   return 0
      |           ^
      |           ;
   29 | }
      | ~
Language: C++

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

signed main() {
    int N;
    cin >> N;
    vector<int> a(N);
    for (int& x : a) cin >> x;
    a.insert(a.begin(), 0);

    vector<vector<int>> div(N + 1);
    for (int i = 1; i <= N; i++) {
        int t = i;
        for (int a = 1; a * a <= t; a++) {
            if (t % a) continue;
            div[i].push_back(a);
            if (t / a != a) div[i].push_back(t / );
        }
    }

    vector<int> cnt(N + 1);
    for (int i = N; i > 0; i--) {
        if (cnt[i] > a[i]) {
            cout << -1 << endl;
            return 0;
        }
        if (cnt[i] == a[i]) continue;
        cerr << i << ": " << cnt[i] << " " << a[i] << endl;

        for (int x : div[i]) {
            cnt[x]++;
        }
    }

    set<int> ans;
    for (int i = 1; i <= N; i++) {
        if (cnt[i] == a[i]) {
            if (a[i]) ans.insert(i);
        }
        else {
            cout << -1 << endl;
            return 0;
        }
    }

    cout << ans.size() << endl;
    for (int x : ans) cout << x << " ";
    cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:50: error: expected primary-expression before ')' token
   18 |             if (t / a != a) div[i].push_back(t / );
      |                                                  ^
Language: C++

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

int main(){
  int n;cin >> n;
  vector<int> a(n);
  rep(i,n) cin >> a[i];
  int m;
  rep(i,n){
    m+=a[i];
  }
  vector<int> b(m);
  if(m!=0){
    rep(i,m){
      rep(j,n){
        if(a[j]==1){
          b[i]=a[j];
          break;
        }
      }
    }
    cout << m << endl;
    rep(i,m){
      cout << b[i] << " ";
    }
  }
  else{
    cout << "0" << endl;
  }
}

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

#include <iostream>
#include <sstream>
#include <iomanip>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <map>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

using namespace std;

const ll BIG = 1000000007LL;

int inputValue(){
    int a;
    cin >> a;
    return a;
};

template<typename T>
void inputArray(T* p, int a){
    rep(i, a){
        cin >> p[i];
    }
};

template<typename T>
void inputVector(vector<T> * p, int a){
    rep(i, a){
        T input;
        cin >> input;
        p -> push_back(input);
    }
}

template <typename T>
void output(T a, int precision = 0) {
    if(precision > 0){
        cout << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

const int Max = 210000;
int N;
int a[Max], ball[Max];

void list_divisors(int n, vector<int>& result) {
    int a = 2;
    while (n >= a * a) {
        if (n % a == 0) {
            result.push_back(a);
            if (a != n / a) {
                result.push_back(n / a);
            }
            n /= a;
        } else {
            a++;
        }
    }
    result.push_back(n);
    result.push_back(1);
}

int main(int argc, const char * argv[]) {
    cin >> N;
    inputArray(a+1, N);

    vector<int> divs;
    divs.reserve(1000);
    vector<int> ones(Max, 0);

    for (int i = N; i >= 1; i--) {
        if (a[i] == 0) {
            ball[i] = ones[i] % 2;
        } else {
            ball[i] = (ones[i] + 1) % 2;
        }
        if (ball[i] == 1) {
            list_divisors(i, divs);
            sort(divs.begin(), divs.end());
            auto& uend = unique(divs.begin(), divs.end());
            divs.erase(uend, divs.end());
            for (auto fac: divs) {
                ones[fac]++;
            }
            divs.clear();
        }
        // rep(i, N+1) {
        //     printf("%d", ones[i]);
        // }
        // printf("\n");
    }

    int M = 0;
    string ans = "";
    repd(i, 1, N+1) {
        if (ball[i] > 0) {
            M++;
            ans += to_string(i) + " ";
        }
    }

    output(M);
    output(ans);

    return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:96:32: error: cannot bind non-const lvalue reference of type '__gnu_cxx::__normal_iterator<int*, std::vector<int> >&' to an rvalue of type '__gnu_cxx::__normal_iterator<int*, std::vector<int> >'
   96 |             auto& uend = unique(divs.begin(), divs.end());
      |                          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

#include <iostream>
#include <vector>
using namespace std;
typedef long long int64;
#define debug(x) cerr << #x << ":" << x << endl;

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

  vector<int> memo(2*n, 0);
  for(int i=n-1;i>=0;--i){
    if (a[i]==0) continue;
    for (int j=sqrt(i+1)+1; j>=1; --j){
      if (j*j>i+1) continue;
      if (i%j!=0) continue;

      memo[j-1] ^= 1;
      memo[i/j-1] ^= 1;
    }
  }

  vector<int> ans;
  for(int i=0;i<n;++i){
    if (memo[i]>0) ans.push_back(i+1);
  }

  cout<<ans.size()<<endl;
  for(int i=0;i<ans.size();++i){
    cout<<ans[i]<<endl;
  }
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:16: error: 'sqrt' was not declared in this scope
   16 |     for (int j=sqrt(i+1)+1; j>=1; --j){
      |                ^~~~