Submission #597196

#	Time	Username	Problem	Language	Result	Execution time	Memory
597196		Trisanu_Das	별들과 삼각형 (IZhO11_triangle)	C++17	100 / 100	462 ms	15584 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
  int n; cin >> n;
  pair<int, int> points[n]; map<int, int> X, Y;
  for(int i = 0; i < n; i++){
    cin >> points[i].first >> points[i].second;
    X[points[i].first]++; Y[points[i].second]++;
  }
  int ans = 0;
  for(int i = 0; i < n; i++) ans += (X[points[i].first] - 1) * (Y[points[i].second] - 1);
  cout << ans << '\n';
}

• Subtask 1: 100 / 100