Submission #1092041

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092041		juicy	Star triangles (IZhO11_triangle)	C++17	0 / 100	0 ms	600 KiB

triangle

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  int n; cin >> n;
  vector<int> x(n), y(n);
  map<int, int> a, b;
  for (int i = 0; i < n; ++i) {
    cin >> x[i] >> y[i];
    ++a[x[i]], ++b[y[i]];
  }
  int res = 0;
  for (int i = 0; i < n; ++i) {
    res += a[x[i] - 1] * b[y[i] - 1];
  }
  cout << res;
  return 0;
}

• Subtask 1: 0 / 100