func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long int t;     cin >> t;     while (t--) {       long long int n;       cin >> n;       string s;       cin >> s;       long long int oc = 0, zc = 0, fpos = -1, lpos;       for (int i = 0; i < (int)n; i++) {         if (s[i] ==  0 )           zc++;         else {           oc++;           if (fpos == -1) {             fpos = i;           }           lpos = i;         }       }       if (oc == 0)         cout << n <<   n ;       else if (zc == 0)         cout << 2 * n <<   n ;       else {         if (s[0] ==  1 ) {           cout << 2 * n <<   n ;         } else {           cout << 2 * max((n - fpos), (lpos + 1)) <<   n ;         }       }     }   }   