제출 #976059

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
976059		vjudge1	Star triangles (IZhO11_triangle)	C++17	100 / 100	281 ms	9104 KiB

triangle

#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();
}

• Subtask 1: 100 / 100