# UVa 1152 – 4 Values whose Sum is 0

```
/*
User ID: turing_13
*/

#include <bits/stdc++.h>

#define pii pair <int,int>
#define sc scanf
#define pf printf
#define Pi 2*acos(0.0)
#define ms(a,b) memset(a, b, sizeof(a))
#define pb(a) push_back(a)
#define MP make_pair
#define oo 1<<29
#define dd double
#define ll long long
#define EPS 10E-10
#define ff first
#define ss second
#define MAX 100
#define SZ(a) (int)a.size()
#define getint(a) scanf("%d",&a)
#define loop(i,n) for(int i=0;i<n;i++)
#define all(a) a.begin(),a.end()
#define intlim 2147483648
#define inf 1000000
#define rtintlim 46340
#define llim 9223372036854775808
#define rtllim 3037000499
#define ull unsigned long long
#define I int

using namespace std;

ll ara[4010][4];
vector<ll>ab;

int main()
{
///freopen("in.txt","r",stdin);
///freopen("out.txt","w",stdout);
int n,t;
sc("%d",&t);
while(t--)
{
ll ans=0;
sc("%d",&n);
for(int i=0; i<n; i++)
{
sc("%lld %lld %lld %lld",&ara[i][0],&ara[i][1],&ara[i][2],&ara[i][3]);
}
for(int i=0; i<n; i++)
for(int j=0; j<n; j++)
{
ab.pb(ara[i][0]+ara[j][1]);
}
sort(all(ab));
for(int i=0; i<n; i++)
for(int j=0; j<n; j++)
{
int val= -(ara[i][2]+ara[j][3]);
ans+= upper_bound(all(ab),val)-lower_bound(all(ab),val);
}
pf("%lld\n",ans);
if(t)
pf("\n");
ab.clear();
}
return 0;
}

```
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