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  1. #include <stdio.h>
  2. int main()
  3. {
  4.     long long a,b,ans;
  5.     scanf("%lld %lld",&a,&b);
  6.     ans = ((a+b)*(b-a+1))/2;
  7.     printf("%lld",ans);
  8. }
Success #stdin #stdout 0s 5276KB
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-200905570824370160
https://ideone.com/3ONKWP
language:
C (gcc 8.3)
created:
81 days ago
visibility:
public

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