Submission #161997

#	Time	Username	Problem	Language	Result	Execution time	Memory
161997		mosiashvililuka	별들과 삼각형 (IZhO11_triangle)	C++14	100 / 100	558 ms	15680 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
long long a,b,c,d,e,pas;
pair <long long, long long> p[300009];
map <long long, long long> x,y;
int main(){
	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	cin>>a;
	for(b=1; b<=a; b++){
		cin>>p[b].first>>p[b].second;
		x[p[b].first]++;
		y[p[b].second]++;
	}
	for(b=1; b<=a; b++){
		pas+=(x[p[b].first]-1)*(y[p[b].second]-1);
	}
	cout<<pas;
	return 0;
}

• Subtask 1: 100 / 100