Grid

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef __int128 lll;
int c[1000];
int main(){
	int n;
	cin>>n;
	vector<string> m(n);
	int rows=0;
	for(int i=0;i<n;++i){
		cin>>m[i];
	}
	for(int i=0;i<n;++i){
		bool row_ok=true;
		for(int j=0;j<n;++j){
			if(m[i][j]=='1')++c[j];
			if(m[i][j]!=m[i][0]){
				row_ok=false;
				if(c[j]<=i){
					cout<<"-1\n";
					return 0;
				}
			}
		}
		if(row_ok)++rows;
	}
	if(rows!=n)for(int i=0;i<n;++i)if(c[i]==n)++rows;
	cout<<rows<<'\n';
	return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: ACCEPTED

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: ACCEPTED

Test 19

Verdict: WRONG ANSWER

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED