#include <bits/stdc++.h>   using namespace std;   const int MAX = 2e5;   int arr[MAX];   int main() {     int T;     cin >> T;     while (T--) {       int n;       cin >> n;       for (int i = 0; i < n; i++) {         int c;         cin >> c;         arr[c - 1] = i;       }       int l = arr[0], r = arr[0];       for (int i = 0; i < n; i++) {         if (arr[i] < l)           l = arr[i];         else if (arr[i] > r)           r = arr[i];         if (i == r - l)           cout << 1;         else           cout << 0;       }       cout <<   n ;     }   }   