Hình ảnh

#include<iostream>
using namespace std;
int A[805][805];
bool checkK(int r, int c, int k)
{
    for (int i = r; i < k + r; i++)
    {
        for (int j = c; j < k + c; j++)
        {
            if (A[i][j] == 0) return false;
        }
    }
    return true;
}
int main()
{
    freopen("input.txt", "r", stdin);
    int n, k, res = 0;
    cin >> n >> k;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cin >> A[i][j];
        }
    }
    for (int i = 0; i <= n - k; i++)
    {
        for (int j = 0; j <= n - k; j++)
        {
            if (checkK(i, j, k)) res += 1;
        }
    }
    cout << res << endl;
    return 0;
}