func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T>   ostream& operator<<(ostream& stream, const pair<T, T>& p) {     return stream <<  (  << p.first <<  ,  << p.second <<  )  ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int T;     cin >> T;     while (T--) {       int i, j, n;       cin >> n;       long long a[n];       for (i = 0; i < n; i++) {         cin >> a[i];       }       long long mx = a[0], mxdiff = a[0] - a[1];       for (i = 1; i < n; i++) {         if (mx - a[i] > mxdiff) mxdiff = mx - a[i];         mx = max(mx, a[i]);       }       if (mxdiff > 0)         cout << (long long)(log2f(mxdiff)) + 1 <<   n ;       else         cout << 0 <<   n ;     }     return 0;   }   