# | Submission time | Handle | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
531497 | 2022-02-28T23:57:52 Z | makanhulia | Star triangles (IZhO11_triangle) | C++17 | 0 ms | 0 KB |
#include <bits/stdc++.h> using namespace std; int main(){ cin.tie(0) -> ios_base::sync_with_stdio(0); int n; cin >> n; vector<int> x(n), y(n); for(int i=0;i<n;i++) { cin >> x[i] >> y[i]; } int ans = 0; for(int i=0;i<n;i++) { int cx = 0, cy = 0; for(int j=0;j<n;j++) { if(x[i] == x[j]) cx++; if(y[i] == y[j]) cy++; } ans += (cx - 1) * (cy - 1); } cout << ans << ' '; }