Grid

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

int v[1000][1000];
int rivit[1000];
int sarakkeet[1000];

int main() {
    int n;
    cin >> n;
    
    
    
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;
        for (int j = 0; j < n; j++) {
            v[i][j] = ((int) s[j]) - 48;
        }
    }
    
    
    for (int i = 0; i < n; i++) {
        
        int summa = 0;
        for (int j = 0; j < n; j++) {
            summa += v[i][j];
        }
        rivit[i] = (summa == n);
    }
    
    for (int i = 0; i < n; i++) {
        
        int summa = 0;
        for (int j = 0; j < n; j++) {
            summa += v[j][i];
        }
        sarakkeet[i] = (summa == n);
    }
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (rivit[i] == 0 && sarakkeet[j] == 0 && v[i][j] == 1) {
                cout << "-1" << endl;
                exit(0);
            }
        }
    }
    
    ll sarakesumma = 0;
    
    for (int i = 0; i < n; i++) {
        sarakesumma += sarakkeet[i];
    }
    
    ll rivisumma = 0;
    
    for (int i = 0; i < n; i++) {
        rivisumma += rivit[i];
    }
    
    
    
    ll total = sarakesumma + rivisumma;
    
    if (total == 2 * n) {
        cout << n << endl;
        return 0;
    }
    
    cout << total << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED