zbir na dve 2D matrici

#include <iostream>

using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;

    // prvata matrica
    int a[n][m] = {};

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
        }
    }

    // vtorata matrica
    int b[n][m] = {};

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> b[i][j];
        }
    }

    // z = a+b
    int z[n][m] = {};

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            z[i][j] = a[i][j] + b[i][j];
        }
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cout << z[i][j] << " ";
        }
        cout << endl;
    }

    return 0;
}