Submission #1249067

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249067		bethance	Star triangles (IZhO11_triangle)	C++20	100 / 100	698 ms	30936 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int x[n],y[n];
	multiset<int> X ;
	multiset<int> Y;
	for(int i=0;i<n;i++){
		cin>>x[i]>>y[i];
		X.insert(x[i]);
		Y.insert(y[i]);
	}
	int ans=0;
	for(int i=0;i<n;i++){
		int x1=X.count(x[i])-1;
		int y1=Y.count(y[i])-1;
		ans+=x1*y1;
	}
	cout<<ans<<endl;
}

• Subtask 1: 100 / 100