Submission #887994

#	Time	Username	Problem	Language	Result	Execution time	Memory
887994		Hovhannes1234	Star triangles (IZhO11_triangle)	C++17	0 / 100	0 ms	348 KiB

triangle

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin>>n;
	map <int, int> mp;
	for(int i=1; i<=n; i++){
		int x,y;
		cin>>x>>y;
		mp[x]++;
	}
	long long ans=0;
	for(auto it : mp){
		if(it.second>1){
			ans+=(it.second*it.second-1)/2 * (n-it.second);
		}
	}
	cout<<ans<<endl;
}

• Subtask 1: 0 / 100