Grid

input/code.cpp: In function 'int main()':
input/code.cpp:30:13: warning: 'isRow' may be used uninitialized in this function [-Wmaybe-uninitialized]
     rows[0] = isRow;
     ~~~~~~~~^~~~~~~

#include <iostream>
#include "stdio.h"
#include <array>

using namespace std;

int main()
{
    int n;
    cin >> n;
    char c;
    bool v, cols[n + 2], rows[n + 2];
    //array<bool, n> cols;
    //array<bool, n> rows;
    bool row;
    bool isRow;
    for (int x = 0; x < n; x++) {
        cin >> c;
        v = (c == 49);
        cols[x] = v;
        if (x == 0) {
            row = v;
            isRow = row;
        } else {
            if (v != row) {
                isRow = 0;
            }
        }
    }
    rows[0] = isRow;
    for (int y = 1; y < n; y++) {
        cin >> c;
        bool row = (c == 49);
        bool isRow = row;
        bool colMatch = (row == cols[0]);
        for (int x = 1; x < n; x++) {
            cin >> c;
            v = (c == 49);
            if (v != row) {
                isRow = 0;
            }
            if (v != cols[x]) {
                colMatch = 0;
            }
        }
        if (!colMatch && !isRow) {
            printf("-1\n");
            return 0;
        }
        rows[y] = isRow;
    }
    int sx = 0, sy = 0;
    for (int x = 0; x < n; x++) {
        sx += cols[x];
        sy += rows[x];
    }
    if (sx == n || sy == n) {
        printf("%i\n", n);
    } else {
        printf("%i\n", sx + sy);
    }
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

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: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: WRONG ANSWER

Test 22

Verdict: ACCEPTED