제출 #880584

#제출 시각아이디문제언어결과실행 시간메모리
880584AlphaMale06별들과 삼각형 (IZhO11_triangle)C++14
100 / 100
245 ms12304 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; map<int, int> xc; map<int, int> yc; int main() { ios_base::sync_with_stdio(0); cin.tie(0); int n; cin >> n; pair<int, int> a[n]; for(int i=0; i< n; i++){ cin >> a[i].first >> a[i].second; xc[a[i].first]++; yc[a[i].second]++; } ll ans=0; for(int i=0; i< n; i++){ ans+=(xc[a[i].first]-1)*1ll*(yc[a[i].second]-1); } cout << ans << '\n'; }
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