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An algorithm is a sequence of well-defined steps that define an abstract solution to a problem. Use this tag when your issue is related to algorithm design.

1 vote
Accepted

Non-recursive tree traversal

I would not throw NullPointerException; it indicate that you are trying to use a variable which is null. Throw IllegalArgumentException instead; it indicated that arguments provided are not in a legal …
DominikM's user avatar
  • 537
1 vote

Flatten iterator for nested list

Your code can end up with StackOverflow exception when you add self reference to the list. List list = new ArrayList(); list.add(list); FlattenIterator flattenIterator = new FlattenIterator(list); wh …
DominikM's user avatar
  • 537
1 vote
Accepted

Merge 2 arrays, when one is larger and can accomodate smaller

Do not throw NullPointerException when arguments are null. NPE is thrown when you are trying to access properties and methods of null reference. Not when you are checking on some preconditions. Throw …
DominikM's user avatar
  • 537