제출 #645537

#제출 시각아이디문제언어결과실행 시간메모리
645537phoenix별들과 삼각형 (IZhO11_triangle)C++17
100 / 100
276 ms13500 KiB
#include<bits/stdc++.h> using namespace std; int main() { ios::sync_with_stdio(0); cin.tie(0), cout.tie(0); int n; cin >> n; vector<pair<int, int>> v; map<int, int> cntX, cntY; for(int i = 1;i <= n;i++) { int x, y; cin >> x >> y; cntX[ x ]++; cntY[ y ]++; v.push_back({x, y}); } long long res = 0; for(auto c : v) { res += 1ll * (cntX[ c.first ] - 1) * (cntY[ c.second ] - 1); } cout << res; }
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