洛谷P2241 统计方形（数据加强版）进阶解法

#include<iostream>

using namespace std;

long long  n, m, s, r;

int main()
{
	cin >> n >> m;
	for (int i = 0; i < min(n, m); i++)
		s += (n - i) * (m - i);
	r = (m + 1) * (n + 1) * m * n / 4 - s;
	cout << s << ' ' << r;
	return 0;
}