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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. long long x[300005],y[300005];
  5. map <long long,long long>ddx;
  6. map <long long,long long>ddy;
  7. int main()
  8. {
  9.     freopen("RTRI.inp","r",stdin);
  10.     freopen("RTRI.out","w",stdout);
  11.     long long n,ans=0;
  12.     cin>>n;
  13.     for(int i=1;i<=n;i++)
  14.     {
  15.         cin>>x[i]>>y[i];
  16.         ddx[x[i]]++;
  17.         ddy[y[i]]++;
  18.     }
  19.     for(int i=1;i<=n;i++)
  20.     {
  21.         ans+=(ddx[x[i]]-1)*(ddy[y[i]]-1);
  22.     }
  23.     cout<<ans;
  24.     return 0;
  25. }
  26.  
Success #stdin #stdout 0s 5292KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/6fFEMX
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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