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