Submission #889453

#	Time	Username	Problem	Language	Result	Execution time	Memory
889453		Kakarot	Star triangles (IZhO11_triangle)	C++98	0 / 100	1 ms	348 KiB

triangle

#include <bits/stdc++.h>
#define ii unordered_map<int,int>
#define vii vector<pair<int,int>>
using namespace std;

void setIO() {
  cin.tie(0)->sync_with_stdio(0);
}

void solve() {
  int n,ans = 0;
  cin >> n;
  ii fx,fy;
  while(n--) {
    int x,y;
    cin >> x >> y;
    ++fx[x];
    ++fy[y];
    ans += (fx[x] >= 2 && fy[y] >= 2 && x != y);
  }
  cout << ans;
}

int main() {
  setIO();
  solve();
  return 0;
}

• Subtask 1: 0 / 100