Grid

input/code.cpp: In function 'int main()':
input/code.cpp:35:14: warning: unused variable 'colMatch' [-Wunused-variable]
         bool colMatch = (row == cols[0]);
              ^~~~~~~~
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]);
        bool X[n + 1];
        X[0] = row;
        if (cols[0] && (c == 49) != cols[0]) {
            cols[0] = 0;
        }
        for (int x = 1; x < n; x++) {
            cin >> c;
            v = (c == 49);
            X[x] = v;
            if (v != row) {
                isRow = 0;
            }
            if (cols[x] && v != cols[x]) {
                cols[x] = 0;
            }
        }
        if (!isRow) {
            for (int x = 0; x < n; x++) {
                //printf("%i, %i\n", cols[x], X[x]);
                if (X[x] != cols[x]) {
                    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: WRONG ANSWER

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