제출 #406313

#제출 시각아이디문제언어결과실행 시간메모리
406313saarang123별들과 삼각형 (IZhO11_triangle)C++17
100 / 100
358 ms12136 KiB
#include <bits/stdc++.h>
using namespace std;
 
signed main(){
	ios_base::sync_with_stdio(false); 
	cin.tie(NULL); 
		
	map<int, int> x, y;
	int n; cin >> n;
	vector<array<int, 2>> a(n);
	for(auto& [i, j] : a){
		cin >> i >> j;
		x[i]++;
		y[j]++;
	}
 
	long long ans = 0;
 
	for(int i = 0; i < n; i++)
		ans += (x[a[i][0]] - 1) * 1LL * (y[a[i][1]] - 1);
 
	cout << ans << '\n';
	return 0;
}
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