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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     long long t,l,r,sum=0;
  7.     cin>>t;
  8.     while(t--)
  9.     {
  10.         cin>>l>>r;
  11.         sum=l;
  12.         for(int i=l+1; i<=r; i++)
  13.         {
  14.             sum+=i;
  15.         }
  16.         cout<<sum<<endl;
  17.  
  18.     }
  19.  
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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3
3 6
11 15
20 25
stdout
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18
65
135
https://ideone.com/j5twha
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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