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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long  a;
  6. 	long long b;
  7. 	cin>>a>>b;
  8. 	if(a>=b*3 && a!=b && a!=0)
  9. 	cout<<(a-b)/2-b;
  10. 	else 
  11. 	cout<<"NO";
  12.  
  13. return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5316KB
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https://ideone.com/ivRo6W
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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