func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200005];   int main() {     int T;     cin >> T;     while (T--) {       int n;       cin >> n;       for (int i = 1; i <= n; i++) {         int t;         cin >> t;         a[t] = i;       }       int l, r, num;       string s =   ;       for (int i = 1; i <= n; i++) {         if (i == 1) {           num = 0;           l = r = a[i];           s +=  1 ;           continue;         }         if (r < a[i])           num += a[i] - r - 1, r = a[i];         else if (l > a[i])           num += l - a[i] - 1, l = a[i];         else           num--;         if (!num)           s +=  1 ;         else           s +=  0 ;       }       cout << s << endl;     }     return 0;   }   