Submission #344279

#	Time	Username	Problem	Language	Result	Execution time	Memory
344279		enerelt14	Star triangles (IZhO11_triangle)	C++14	100 / 100	632 ms	7536 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int x[n+1], y[n+1];
	map<int, int>ax;
	map<int, int>ay;
	for (int i=1;i<=n;i++){
		cin>>x[i]>>y[i];
		ax[x[i]+1e9]++;
		ay[y[i]+1e9]++;
	}
	long long res=0;
	for (int i=1;i<=n;i++){
		res+=(ax[x[i]+1e9]-1)*(ay[y[i]+1e9]-1);
	}
	cout<<res;
}

• Subtask 1: 100 / 100