var
  loc,cas,xx,n,i,j:longint;
  a:array[0..1010]of longint;
  begin
    readln(cas);
    for xx:=1 to cas do
      begin
        readln(n);
        for i:=1 to n do read(a[i]);
        readln;
        loc:=n;
        for i:=n downto 1 do
          if a[i]=loc then dec(loc);
        writeln(loc);
      end;
  end.