TJ

3、2、1 上代码

#include<bits/stdc++.h>
#define int long long
using namespace std;
int a, b, sum;
signed main() {
    cin >> a >> b;
    for(int i = 1;i <= min(a, b);i++) {
        sum += (a - i + 1) * (b - i + 1);
    }
    cout << sum;
    return 0;
}