Yeah, we get lots of bad questions here, so I completely understand the general frustration. However, having replied to this poster before, I think snehit.ar is one of the better wisdom seekers: usually provides enough information so the questions can be answered in a fairly straightforward manner, AFAICT takes our advice to write their own code (example) - unless I've missed something and you've found where the code was copied from? Even without that background, the root node is well-formed: sample input, runnable, mostly well-formatted code with only two unnecessary lines, expected output - all the stuff we love to complain about loudly when it's missing ;-) So all that taken together is why I had no problem providing code in this case. (And in the end the fix to the original code turned out to be a two-line patch.)