Submission #1219541

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219541		checker1234	Star triangles (IZhO11_triangle)	C++20	100 / 100	369 ms	9216 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
	int n;
	cin>>n;
	vector<pair<int,int>>a(n);
	map<int,int>freqx,freqy;
	for(int i=0;i<n;i++)
	{
		cin>>a[i].first>>a[i].second;
		freqx[a[i].first]++;
		freqy[a[i].second]++;
	}
    int cnt=0;
    for(int i=0;i<n;i++)
	{
		int cx=freqx[a[i].first]-1;
		int cy=freqy[a[i].second]-1;
		cnt+=cx*cy;
	}

	cout<<cnt<<endl;
}

• Subtask 1: 100 / 100