Submission #500715

#	Time	Username	Problem	Language	Result	Execution time	Memory
500715		aryan12	Star triangles (IZhO11_triangle)	C++17	100 / 100	281 ms	15576 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long
 
int32_t main() {
  	ios_base::sync_with_stdio(0);
  	cin.tie(0);
  	int n;
  	cin >> n;
  	vector<pair<int, int> > a(n);
  	map<int, int> x, y;
  	for(int i = 0; i < n; i++) {
      	cin >> a[i].first >> a[i].second;
      	x[a[i].first]++;
      	y[a[i].second]++;
    }
  	int ans = 0;
  	for(int i = 0; i < n; i++) {
      	ans += (x[a[i].first] - 1) * (y[a[i].second] - 1);
    }
  	cout << ans << "\n";
}

• Subtask 1: 100 / 100