Submission #336916

#	Time	Username	Problem	Language	Result	Execution time	Memory
336916		boykut	Star triangles (IZhO11_triangle)	C++14	0 / 100	1 ms	384 KiB

triangle

#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) * (ox[a[i].y] - 1)));
  }
  cout << res << '\n';
  return 0;
}

• Subtask 1: 0 / 100