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  1. #include <stdio.h>
  2. int main(){
  3. 	int l,r;
  4. 	scanf("%d%d",&l,&r);
  5. 	long long ssh=((r-1)-(l+1))/2+1;
  6. 	long long s= ssh*(r+l)/2;
  7. 	printf ("%lld",s);
  8. 	return 0;
  9.  
  10. }
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin 
1 99999
stdout 
2499950000
https://ideone.com/QpR9Oq
language:
C (gcc 8.3)
created:
2 years ago
visibility:
public

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