func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, t;     cin >> t;     while (t--) {       cin >> n;       int arr[n];       for (int i = 0; i < n; i++) {         cin >> arr[i];       }       int mx, x;       mx = 0;       for (int i = 1; i < n; i++) {         if (arr[i] < arr[i - 1]) {           x = arr[i - 1] - arr[i];           if (x > mx) {             mx = x;           }           arr[i] = arr[i - 1];         }       }       int ans = 0;       while (mx != 0) {         mx = mx / 2;         ans++;       }       cout << ans << endl;     }     return 0;   }   