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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4.  
  5. ll t, n, res, tmp, arr[100009];
  6.  
  7. ll fast_expo(ll a, ll b){
  8. 	if(b == 0) return 1;
  9. 	if(b == 1) return a;
  10.  
  11. 	else {
  12. 		tmp = fast_expo(a, b / 2);
  13. 		res = tmp*tmp;
  14. 		if(b % 2 == 1){
  15. 			res *= a;
  16. 		}
  17. 	}
  18. 	return res;
  19. }
  20.  
  21. int main(){
  22. 	cin >> t;
  23. 	while(t--){
  24. 		cin >> n;
  25. 		for(int i = 0; i < n; i++){
  26. 			cin >> arr[i];
  27. 		}
  28.  
  29. 		ll maks = -1;
  30. 		for(int i = 1; i < n; i++){
  31. 			if(arr[i] < arr[i - 1]){
  32. 				maks = max(maks, arr[i - 1] - arr[i]);
  33. 				arr[i] = arr[i - 1];
  34. 			}
  35. 		}
  36.  
  37. 		ll pangkat = 0;
  38. 		while(fast_expo(2, pangkat) < maks){
  39. 			pangkat++;
  40. 		}
  41.  
  42. 		if(maks == -1){
  43. 			cout << 0 << endl;
  44. 		} else {
  45. 			cout << pangkat + 1 << endl;
  46. 		}
  47. 	}
  48. }
Success #stdin #stdout 0.01s 5432KB
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https://ideone.com/dodS0u
language:
C++14 (clang 8.0)
created:
332 days ago
visibility:
public

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