UVALive 5846 计数

#include<stdio.h>
#include<iostream>
#include<string.h>
using namespace std;

int r[1100], b[1100];

int main()
{
    int t;
    cin >> t;
    while(t--)
    {
        int n;
        cin >> n;
        memset(r, 0, sizeof(r));
        memset(b, 0, sizeof(b));
        //cout << n << "==" << endl;
        for (int i=0; i<n; ++i)
        {
            //cout << i << endl;
            for (int j=i+1; j<n; ++j)
            {
                int temp;
                cin >> temp;
                if (temp == 1) {r[i]++, r[j]++;}
                else {b[i]++, b[j]++;}
            }
        }

        int sum = 0;
        for (int i=0; i<n; ++i)
        {
            sum += r[i]*b[i];
        }

        int ans = n*(n-1)*(n-2)/3/2-sum/2;
        cout << ans << endl;
    }
    return 0;
}