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  1. #include<iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     long t;
  6.     cin>>t;
  7.     while(t--)
  8.     {
  9.        long long n;
  10.        cin>>n;
  11.        long long sum=((n-1)*(n))/2;
  12.        cout<<2*n+sum<<"\n";
  13.  
  14.  
  15.     }
  16.  
  17.     return 0;
  18.  
  19.  
  20. }
Success #stdin #stdout 0s 3100KB
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https://ideone.com/Iv7a4K
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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