Firstly, this is veering completely off-topic. Further, the default depth for viewing threads is Re^3 so most won't even view this new question. Start a new thread when you have a new question - you can always add a link to a previous thread if it has supporting information.

You have an off-by-one error. An array of 10 elements has indices in the range 0 to 9. In the outer loop, you're checking the correct range with 0 to $#array1; in the inner loop you're checking past the end of the array: 0 to scalar(@{$array1[$x]}).