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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main() 
  4. {
  5.    long long a,b;
  6.    cin>>a>>b;
  7.    if(a%2!=0)
  8.    a++;
  9.    if(b%2!=0)
  10.    b--;
  11.    cout<<(b-a+1)*(a+b)/2;
  12. }
Success #stdin #stdout 0.01s 5284KB
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4181190637829603816
https://ideone.com/exf2SB
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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