func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200005];   int f[200005];   int main() {     ios::sync_with_stdio(false);     int t, n;     cin >> t;     for (int i = 0; i < t; i++) {       cin >> n;       int maxx = 0;       int minx = 999999999;       for (int j = 0; j < n; j++) {         cin >> a[j];         f[a[j]] = j;       }       for (int j = 1; j <= n; j++) {         maxx = max(maxx, f[j]);         minx = min(minx, f[j]);         if (maxx - minx == j - 1) {           cout << 1;         } else           cout << 0;       }       cout << endl;     }     return 0;   }   