제출 #1326665

#제출 시각아이디문제언어결과실행 시간메모리
1326665kawhiet별들과 삼각형 (IZhO11_triangle)C++20
100 / 100
291 ms5848 KiB
#include <bits/stdc++.h> using namespace std; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; vector<int> x(n), y(n); map<int, int> a, b; for (int i = 0; i < n; i++) { cin >> x[i] >> y[i]; a[x[i]]++; b[y[i]]++; } long long ans = 0; for (int i = 0; i < n; i++) { ans += 1LL * (a[x[i]] - 1) * (b[y[i]] - 1); } cout << ans << '\n'; return 0; }
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