Hello Krazy! Thank you, the description is good now, so I hope it will be clearer for future warriors.

And I just solved this kata in Java - found out that it doesn't support Java only when I tried to submit my solution. Well, I've learnt my lesson - always check supported languages before starting work on a kata.

You could remove areAllElementsZero and simply check if max==0, seen that max is being calculated anyways. If max is zero then all elements must be zero.

And yes, the boolean isMerge is unnecessary, a simple direct return would have been sufficient here. I just saw this after submitting the code... :-)

Just change the input and return types of your solution from long[] to int[] and it will work.