func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, o, p, x, y, z;   vector<long long> a, b, c, d;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long t;     cin >> t;     while (t--) {       cin >> n;       string s;       cin >> s;       int leftFirst = -1;       int rightFirst = -1;       for (long long i = 0; i < n; i++)         if (s[i] ==  1 ) {           leftFirst = i;           break;         }       for (long long i = 0; i < n; i++)         if (s[i] ==  1 ) {           rightFirst = i;         }       if (leftFirst == -1) {         cout << n << endl;         continue;       }       if (rightFirst >= n - leftFirst) {         cout << 2 * (rightFirst + 1) << endl;       } else         cout << 2 * (n - leftFirst) << endl;     }     return 0;   }   