Submission #1219525

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219525		checker1234	Star triangles (IZhO11_triangle)	C++20	0 / 100	2092 ms	1860 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);
	for(int i=0;i<n;i++)
		cin>>a[i].first>>a[i].second;

	int cnt=0;

	for(int i=0;i<n;i++)
	{
		int x=a[i].first,y=a[i].second;
		int cx=0,cy=0;

		for(int j=0;j<n;j++)
		{
			if(i==j) continue;
			if(a[j].first==x)cx++;
			if(a[j].second==y)cy++;
		}

		cnt+=cx*cy;
	}

	cout<<cnt<<endl;
}

• Subtask 1: 0 / 100