Skalaren Proizvod

#include <iostream>

using namespace std;


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

    int a[n][n];

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

    int p, q;
    cin >> p >> q;

    int zbir = 0;

    for (int i = 0; i < n; i++) {
        zbir += (a[p][i] * a[i][q]);
    }

    cout << zbir << endl;

    return 0;
}