func_code_string: #include <bits/stdc++.h>   using namespace std;   int T;   int main() {     cin.tie(0);     ios_base::sync_with_stdio(0);     cin >> T;     for (int i = 0; i < T; i++) {       int n, oneCnt = 0, zeroCnt = 0;       cin >> n;       string str;       for (int j = 0; j < n; j++) {         char ch;         cin >> ch;         str.push_back(ch);         if (ch ==  1 ) oneCnt++;       }       if (oneCnt == 1) {         cout << 0 <<   n ;         continue;       };       int len = str.length();       int start = 0, end = 0;       for (int j = 0; j < len; j++) {         if (str[j] ==  1 ) {           start = j;           break;         }       }       for (int j = len - 1; j > -1; j--) {         if (str[j] ==  1 ) {           end = j;           break;         }       }       for (int j = start; j <= end; j++) {         if (str[j] ==  0 ) zeroCnt++;       }       cout << zeroCnt <<   n ;     }     return 0;   }   