Submission #886443

#TimeUsernameProblemLanguageResultExecution timeMemory
886443ZeroStar triangles (IZhO11_triangle)C++17
100 / 100
272 ms20480 KiB
#include<bits/stdc++.h> #define int long long #define INF 1e9 #define pb push_back using namespace std; void solve(){ int n; cin >> n; vector<pair<int,int>> v; map<int,int> x,y; for(int i=0; i < n; i ++){ int q,w; cin >> q >> w; v.pb({q,w}); x[q]++; y[w] ++; // y[q]++; x[w] ++; } int s = 0; for(auto i : v){ s += (x[i.first] - 1) * (y[i.second] - 1); } cout << s; } signed main(){ cin.tie(0)->sync_with_stdio(0); cout.tie(0)->sync_with_stdio(0); int t; t=1; // cin >> t; while(t--){ solve(); cout << '\n'; } }
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