Submission #76212

#	Time	Username	Problem	Language	Result	Execution time	Memory
76212		nvmdava	Star triangles (IZhO11_triangle)	C++17	100 / 100	854 ms	39120 KiB

triangle

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

• Subtask 1: 100 / 100