Submission #700176

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
700176	2023-02-18 18:38:47	pera	Star triangles (IZhO11_triangle)	C++14	100 / 100	287 ms	15644 KiB

triangle

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#include<bits/stdc++.h>
#include<vector>
using namespace std;
#define pb push_back
#define ll long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
const ll mod = 1e9 + 7 , N = 2e5 + 100;
int main(){
  ios::sync_with_stdio(0);
  cin.tie(0),cout.tie(0);
  ll n;cin >> n;
  ll ans = 0;
  map<ll , ll> mx , my;
  vector<pair<ll , ll>> a(n + 1);
  for(int i = 1;i <= n;i ++){
    cin >> a[i].first >> a[i].second;
    ++ mx[a[i].first];
    ++ my[a[i].second];
  }
  for(int i = 1;i <= n;i ++){
    ans += (mx[a[i].first] - 1) * (my[a[i].second] - 1);
  }
  cout << ans << endl;
}
 
 
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• Subtask 1: 100 / 100