Even Grid

input/code.cpp: In function 'int main()':
input/code.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for(int i=1; i<cols.size(); i++){
      |                  ~^~~~~~~~~~~~
input/code.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |             for(int l=1; l<fils.size(); l++){
      |                          ~^~~~~~~~~~~~

#include <iostream>
#include <vector>

using namespace std;

int main(){

    int n;
    cin >> n;

    vector<vector<int>> grid(n,vector<int>(n));

    vector<bool> cols(n,true);
    vector<bool> fils(n,true);


    for(int i=0;i<n;i++){
        for(int l=0; l<n; l++){
            char temp;
            cin >> temp;
            if(temp=='?'){
                grid[i][l]=-1;
            }
            else if(temp=='1'){
                grid[i][l]=1;
                fils[i] = !fils[i];
                cols[l] = !cols[l];
            }
            else{
                grid[i][l]=0;
            }
        }
    }


    for(int i=1; i<cols.size(); i++){
        if(!cols[i]){
            for(int l=1; l<fils.size(); l++){
                if(!fils[l]){
                    grid[l][i]=1;
                    cols[i]=true;
                    fils[i]=true;
                    break;
                }
                
            }
        }
    }

    for(int i=0;i<n;i++){
        for(int l=0; l<n; l++){
            if(grid[i][l]==-1){
                cout << 0;
                continue;
            }
            cout << grid[i][l];
        }
        cout << endl;
    }

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER