제출 #336917

#제출 시각아이디문제언어결과실행 시간메모리
336917boykut별들과 삼각형 (IZhO11_triangle)C++14
100 / 100
730 ms21460 KiB
#include <map>
#include <iostream>

using namespace std;

struct point {
  long double x, y;
};

map < long double, int64_t > ox;
map < long double, int64_t > oy;

//ifstream cin("triangles.in");
//ofstream cout("triangles.out");

int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  point a[n];

  for (int i = 0; i < n; i++) {
    cin >> a[i].x >> a[i].y;
    ox[a[i].x]++;
    oy[a[i].y]++;
  }

  int64_t res = 0;
  for (int i = 0; i < n; i++) {
    res += max((int64_t)(0), (int64_t)((ox[a[i].x] - 1) * (oy[a[i].y] - 1)));
  }
  cout << res << '\n';
  return 0;
}
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