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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.     int a, sum=0;
  6.     cin>>a;
  7.     if(a<0)
  8.         cout<<"-";
  9.     a=abs(a);
  10.     sum=(a*a+1)/2;
  11.     cout<<sum<<endl;
  12.     return 0;
  13. }
  14.  
Success #stdin #stdout 0s 4480KB
comments (?)
stdin
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-3
stdout
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-5
https://ideone.com/EmOr8T
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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