zoj 2316 Matrix Multiplication

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=1316

水！！！

代码：

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<cmath>

#define ll long long
using namespace std;

const int N=200005;
const ll MOD = 1000000007;
ll a[N];
int main()
{
	//freopen("data.in","r",stdin);
	int T;
	cin>>T;
	while(T--)
	{
		int n,m;
		cin>>n>>m;
		memset(a,0,sizeof(a));
		for(int i=1;i<=m;++i)
		{
			int l,r;
			cin>>l>>r;
			++a[l];++a[r];
		}
		ll ans=0;
		for(int i=1;i<=n;++i)
		{//cout<<a[i]<<endl;
			ans+=(a[i]*a[i]);
		}
		cout<<ans<<endl;
		if(T>0)cout<<endl;
	}
	return 0;
}