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  1. #include<stdio.h>
  2. int main(){
  3.     int n,N,ans;
  4.     scanf("%d",&N);
  5.     if(N > 1){
  6.         n=N;
  7.     }else{
  8.         n=-1*N+2;
  9.     }
  10.     ans=(n*(N+1))/2;
  11.     printf("%d\n",ans);
  12.     return 0;
  13.  
  14. }
  15.  
Success #stdin #stdout 0s 10320KB
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https://ideone.com/Eec08f
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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