제출 #88467

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
88467		1Khan	Star triangles (IZhO11_triangle)	C++14	0 / 100	2045 ms	784 KiB

triangle

// In the name of GOD

#include <bits/stdc++.h>

using namespace std;

#define good exit(0);
#define nl endl
#define ios ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define sz(s) (int)s.size()
#define all(s) s.begin(), s.end()
#define pb push_back
#define bb begin()
#define ee end()
#define ff first
#define ss second
#define ll long long
#define db double
#define pii pair<int, int>

const int N = 3e5 + 555;

int n;
int x[11111], y[11111];
int ans;
int main(){

     ios

     cin >> n;
     for(int i = 1; i <= n; ++i){
          cin >> x[i] >> y[i];
     }
     for(int b = 1; b <= n; ++b){
          for(int e = 1; e <= n; ++e){
               for(int u = 1; u <= n; ++u){
                    if(b != e && b != u && e != u){
                         int q = 0;
                         if(x[b] != x[e] && y[b] == y[e] && x[b] == x[u] && y[b] != y[u]){
                              q = 1;
                         }
                         if(x[b] != x[e] && y[b] == y[e] && x[e] == x[u] && y[e] != y[u]){
                              q = 1;
                         }
                         ans += q;
                    }

               }
          }
     }
     cout << ans / 2;
     return 0;
}

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