解：

#include <iostream>
#include <vector>
using namespace std;
int main() {
    int n, m;
    cin >> n >> m;
    vector<string> A(n);
    for (int i = 0; i < n; i++) {
        cin >> A[i];
    }
    vector<string> B(n);
    for (int i = 0; i < n; i++) {
        cin >> B[i];
    }
    int count = 0; 
    for (int x = 0; x <= n - m; x++) {
        for (int y = 0; y <= n - m; y++) {
            int diff = 0; 
            for (int i = 0; i < m; i++) {
                for (int j = 0; j < m; j++) {
                    if (A[x + i][y + j] != B[x + i][y + j]) {
                        diff++;
                    }
                }
            }
            if (diff == 1) {
                count++;
            }
        }
    }
    cout << count << endl;
    return 0;
}

请记得开心