#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n, i, mi, ma, x;
    cin >> n;
    int m[n + 1];
    for (i = 1; i <= n; i++) {
      cin >> x;
      m[x] = i;
    }
    int a[n + 1];
    a[1] = 1;
    a[n] = 1;
    mi = m[1];
    ma = m[1];
    for (i = 2; i < n; i++) {
      mi = min(mi, m[i]);
      ma = max(ma, m[i]);
      if ((ma - mi) == i - 1) {
        a[i] = 1;
      } else {
        a[i] = 0;
      }
    }
    for (i = 1; i <= n; i++) {
      cout << a[i];
    }
    cout << endl;
  }
}
