Submission #314266

#	Time	Username	Problem	Language	Result	Execution time	Memory
314266		kshitij_sodani	Star triangles (IZhO11_triangle)	C++14	100 / 100	431 ms	9208 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
#define endl '\n' 
llo n;
llo aa[300001];
llo bb[300001];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n;
	map<llo,llo> ss;
	map<llo,llo> tt;
	for(llo i=0;i<n;i++){
		cin>>aa[i]>>bb[i];
		ss[aa[i]]++;
		tt[bb[i]]++;
	}
	llo ans=0;
	for(llo i=0;i<n;i++){
		ans+=(ss[aa[i]]-1)*(tt[bb[i]]-1);
	}
	cout<<ans<<endl;















	return 0;
}

• Subtask 1: 100 / 100