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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int a,b,k,x;
  7. 	cin>>a>>b>>k>>x;
  8.  
  9. 	int max=k+x;
  10. 	int min=k-x;
  11.  
  12. 	if(max<a)
  13. 		cout<<"IMPOSSIBLE";
  14. 	else if(max>=b && a<=min)
  15. 		cout<<b-min+1;
  16. 	else if(max<=a && max<=b)
  17. 		cout<<max-a+1;
  18. 	else if(min <=a && max>=b)
  19. 		cout<<b-a+1;
  20. 	else
  21. 		cout<<max-min+1;
  22.  
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5300KB
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stdin
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stdout
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IMPOSSIBLE
https://ideone.com/YQueh8
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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