UVa 10790 How Many Points of Intersection?

/*coder: ACboydate: 2010-3-4result: ACdescription: UVa 10790 How Many Points of Intersection?*/#include <iostream>using namespace std;int main(){long long a, b;int count = 0;long long total;#ifndef ONLINE_JUDGEfreopen("10790.txt", "r", stdin);#endifwhile (cin >> a >> b){if (a == 0 && b == a) break;total = 0;if (a > b) {long long temp = a;a = b; b = temp;}total = b * (b - 1) * a * (a - 1) / 4;/*if (a == 1 || b == 1) total = 0;else {total = b * (b - 1) / 2;long long currentLines = 2 * b;long long countedPoint = 2;for (long long i = 1; i <= a - 2; i++) {for (long long j = 1; j <= b - 1; j++) {total += currentLines - j * countedPoint;}countedPoint++;}}*/cout << "Case " << ++count << ": " << total << endl;}return 0;}