Write a non-recursive traversal of a Binary Search Tree using constant space and O(n) run time

Question

This is not homework, this is an interview question.

The catch here is that the algorithm should be constant space. I\'m pretty clueless on how to d

Answer 1

If you are using a downwards pointer based tree and don't have a parent pointer or some other memory it is impossible to traverse in constant space.

It is possible if your binary tree is in an array instead of a pointer-based object structure. But then you can access any node directly. Which is a kind of cheating ;-)