#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n, i;
  cin >> n;
  int a[n], b[n + 1];
  for (i = 0; i < n; i++) {
    cin >> a[i];
    b[a[i]] = i;
  }
  int l, r, ans[n + 1];
  l = b[1];
  r = b[1];
  for (i = 2; i <= n; i++) {
    l = min(l, b[i]);
    r = max(r, b[i]);
    if ((r - l + 1) != i)
      ans[i] = 0;
    else
      ans[i] = 1;
  }
  cout << 1;
  for (i = 2; i <= n; i++) cout << ans[i];
  cout << endl;
}
int main() {
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
