Quiz 10: Find height of Tree after Nth cycle

Problem:
There is a tree (initial height- 1mt) which grows twice its current length in 1st cycle and grows by 1 mt in 2nd cycle and then again twice its current length in 3rd cycle and by 1mt in 4th cycle and so on.
Find the height after Nth cycle.
Input is in form of  T and N(i), where T is number of input and N(i) is the cycle number for which height is required.
Also, 0<=T<=10 and 0<=N<=30

Sample Input:
2
0
3

Sample Output:
1
6
Explanations:- T=2, so we need to find height after 0th cycle and after 3rd cycle

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Solution:

$T = <STDIN>;
if($T<0 or $T>10)
{
exit;
}
@arr;
$h=0;
for(my $i=0;$i<$T;$i++)
{
$arr[$i] = <STDIN>;
if($arr[$i]<0 or $arr[$i]>30)
{
exit;
}
}
for(my $j=0;$j<@arr;$j++)
{
   for(my $k=0;$k<=$arr[$j];$k++)
      {
      if($k%2 == 0)
          {
          $h = $h + 1;
           }
      else{
           $h = 2 * $h;
           }
      }
print "$h\n";
$h=0;
}

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Tips:

• % is modulus, used to find if number is even or odd