제출 #976059

#제출 시각아이디문제언어결과실행 시간메모리
976059vjudge1별들과 삼각형 (IZhO11_triangle)C++17
100 / 100
281 ms9104 KiB
#include <bits/stdc++.h>
#define int long long
#define f first
#define s second
#define pb push_back
#define endl '\n'
using namespace std;

int N,x[300003],y[300003],ans;
map<int, int> row;
map<int, int> col;

void solve() {
	cin >> N;
	for (int i = 1; i <= N; i++) {
		cin >> x[i] >> y[i];
		row[x[i]]++;
		col[y[i]]++;
	}
	for (int i = 1; i <= N; i++) ans += (row[x[i]] - 1) * (col[y[i]] - 1);
	cout << ans << endl;
}

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int tttt = 1;
	// cin >> tttt;
	while (tttt--) solve();
}
#Verdict Execution timeMemoryGrader output
Fetching results...