Submission #488711

#	Time	Username	Problem	Language	Result	Execution time	Memory
488711		irmuun	Star triangles (IZhO11_triangle)	C++17	100 / 100	555 ms	15460 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
	ll n,i,a[300001],b[300001],ans=0;
	map<ll,ll>x,y;
	cin>>n;
	for(i=1;i<=n;i++){
		cin>>a[i]>>b[i];
		x[a[i]]++;
		y[b[i]]++;
	}
	for(i=1;i<=n;i++){
		ans+=(x[a[i]]-1)*(y[b[i]]-1);
	}
	cout<<ans;
}

• Subtask 1: 100 / 100