#include <bits/stdc++.h>
#pragma GCC target("avx2")
#pragma GCC optimization("O3")
#pragma GCC optimization("unroll-loops")
using namespace std;
const int mod = 1e9 + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    long long n, m, a, b, i, j;
    cin >> n;
    deque<long long> dq, tmp;
    long long ar[n], ans[n];
    set<long long> s;
    for (i = 0; i < n; i++) {
      cin >> a;
      ar[a - 1] = i;
      ans[i] = 0;
    }
    a = n, b = 0;
    for (i = 0; i < n; i++) {
      a = min(a, ar[i]);
      b = max(b, ar[i]);
      if (b - a == i) ans[i] = 1;
    }
    for (i = 0; i < n; i++) cout << ans[i];
    cout << endl;
  }
  return 0;
}
