Submission #1211770

#TimeUsernameProblemLanguageResultExecution timeMemory
1211770michael12Star triangles (IZhO11_triangle)C++20
0 / 100
0 ms528 KiB
#include<bits/stdc++.h> #define ff first #define ss second #define pb push_back #define ll long long using namespace std; int main(){ long long tt; cin >> tt; map<long long, long long> mp, mp1; int x,y; int ans[tt], ans1[tt]; for(long long i = 0; i < tt; i++){ cin >> ans[i] >> ans1[i]; mp[ans[i]]++; mp1[ans1[i]]++; } long long s = 0; for(long long i = 0; i < tt; i++){ s += (mp[ans[i]] - 1) * (mp[ans1[i]] - 1); } cout << s; }
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