Submission #899210

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
899210	2024-01-05 15:37:41	pcc	Star triangles (IZhO11_triangle)	C++14	100 / 100	254 ms	5980 KiB

triangle

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>
const int mxn = 3e5+10;
map<int,int> xcnt,ycnt;
pii arr[mxn];
int main(){
  ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  int n;
  cin>>n;
  for(int i = 0;i<n;i++){
    cin>>arr[i].fs>>arr[i].sc;
    xcnt[arr[i].fs]++;
    ycnt[arr[i].sc]++;
  }
  ll ans = 0;
  for(int i = 0;i<n;i++){
    ans += 1ll*(xcnt[arr[i].fs]-1)*(ycnt[arr[i].sc]-1);
  }
  cout<<ans;
}
 
 
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• Subtask 1: 100 / 100