AC题解

#include <iostream>
using namespace std;

int main() {
    int n, m;
    cin >> n >> m;
    int ans = 0;
    for (int i = 1; i <= min(n, m); i++) {
        ans += (n - i + 1) * (m - i + 1);
    }
    cout << ans << endl;
    return 0;
}