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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.   int l, r;
  7.   cin >> l >> r;
  8.   long long res = 0;
  9.   for (int x=l; x<=r; x+=2) res+= x;
  10.   cout << res << endl;
  11.  
  12.   return 0;
  13. }
Success #stdin #stdout 0.29s 5608KB
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stdin
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-1000000000 1000000000
stdout
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0
https://ideone.com/XzwwB3
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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