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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long long int a,b,c=0,e,f,d;
  7. 	cin>>a>>b;
  8. 	if(b<a)
  9. 	{
  10. 		swap(a,b);
  11. 	}
  12. 	d=(b*(b+1))/2;
  13. 	e=a-1;
  14. 	f=(e*(e+1))/2;
  15. 	cout<<d-f<<"\n";
  16. 	// your code goes here
  17. 	return 0;
  18. }
Success #stdin #stdout 0.01s 5540KB
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https://ideone.com/Wien5N
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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