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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long int
  4.  
  5. int main() {
  6. 	int t;
  7. 	cin>>t;
  8. 	while(t--){
  9. 		int n, x;
  10. 		cin>>n>>x;
  11. 		int ans = 0, prev = 0;
  12. 		for(int i=0;i<n;i++){
  13. 			int a;
  14. 			cin>>a;
  15. 			ans=max(ans, a-prev);
  16. 			prev=a;
  17. 		}
  18. 		ans= max(ans, 2*(x-prev));
  19. 		cout<<ans<<endl;
  20. 	}
  21. 	return 0;
  22. }
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin 
3
3 7
1 2 5
3 6
1 2 5
1 10
7
stdout 
4
3
7
https://ideone.com/xTJyL2
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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