Submission #532115

#	Time	Username	Problem	Language	Result	Execution time	Memory
532115		devariaota	Star triangles (IZhO11_triangle)	C++17	0 / 100	1 ms	332 KiB

triangle

#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
typedef long long ll;
using namespace std;

ll n, ans;
pair<ll,ll>arr[300005];
ll x[300005], y[300005];

int main(){
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> arr[i].fi >> arr[i].se;
    x[arr[i].fi]++; y[arr[i].se]++;
  }
  for(int i = 0; i < n; i++){
    ans += (x[arr[i].fi]-1) * (y[arr[i].se]-1);
  }
  cout << ans << endl;
}

• Subtask 1: 0 / 100