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  1. #include <iostream>
  2. using namespace std;
  3. #define ll long long int
  4. #include <cmath>
  5. int main() {
  6. 	ll a;
  7. 	cin>>a;
  8. 	for(ll i=0;i<a;i++){
  9. 		ll b,c=0;
  10. 		cin>>b>>c;ll e=0;
  11. 		ll d[b]={0};ll max=0;ll min=100000000000;
  12. 		for(ll j=0;j<b;j++) {cin>>d[j];
  13. 			if(d[j]>max) max=d[j];
  14. 			if(d[j]<min) min=d[j];
  15. 		}
  16. 		e=abs(max-min);
  17. 		if(e>(2*c)) cout<<-1<<endl;
  18. 		else {
  19. 			cout<<min+c<<endl;
  20. 		}
  21.  
  22. 	}
  23.  
  24. 	// your code goes here
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/M1u569
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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