제출 #331104

#제출 시각아이디문제언어결과실행 시간메모리
331104AlexLuchianov별들과 삼각형 (IZhO11_triangle)C++14
100 / 100
363 ms5868 KiB
#include <iostream>
#include <vector>
#include <map>

using ll = long long;
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

std::map<int,int> frecx, frecy;

int const nmax = 300000;
int v[1 + nmax][2];

int main() {
  std::ios::sync_with_stdio(0);
  std::cin.tie(0);

  int n;
  std::cin >> n;
  for(int i = 1;i <= n; i++)
    std::cin >> v[i][0] >> v[i][1];
  for(int i = 1;i <= n; i++) {
    frecx[v[i][0]]++;
    frecy[v[i][1]]++;
  }
  ll result = 0;
  for(int i = 1;i <= n; i++)
    result += 1LL * (frecx[v[i][0]] - 1) * (frecy[v[i][1]] - 1);
  std::cout << result;
}
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