Submission #888258

#TimeUsernameProblemLanguageResultExecution timeMemory
888258preskoStar triangles (IZhO11_triangle)C++14
0 / 100
0 ms348 KiB
#include<iostream> #include<bits/stdc++.h> #define MAXN 300010 using namespace std; map<int,int> row,col; pair<int,int> p[MAXN]; int main() { int n,x,y; long long ans=0; ios_base::sync_with_stdio(false); cin>>n; for(int i=1;i<=n;i++) { cin>>p[i].first>>p[i].second; row[p[i].second]++; col[p[i].first]++; } for(int i=1;i<=n;i++) { long long l=row[p[i].first]-1; long long r=row[p[i].second]-1; l=l*r; ans+=l; } cout<<ans<<"\n"; }

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:9:11: warning: unused variable 'x' [-Wunused-variable]
    9 |     int n,x,y;
      |           ^
triangle.cpp:9:13: warning: unused variable 'y' [-Wunused-variable]
    9 |     int n,x,y;
      |             ^
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