Grokking the Coding Interview: Patterns for Coding Questions
Ask Author
Back to course home

0% completed

Vote For New Content
Solution: Binary Search Tree Iterator
Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Problem Statement

Implement an iterator for the in-order traversal of a binary search tree (BST). That is, given a BST, we need to implement two functions:

bool hasNext(): Returns true if at least one element is left in the in-order traversal of the BST. int next(): Return the next element in the in-order traversal of the BST.

Example:

Given the following BST:

Here is the in-order traversal of this tree: [1, 4, 10, 14, 15, 19, 20]

Here is the expected output from the algorithm based on different calls:

hasNext() -> true

next() -> 1

next() -> 4

.....

.....

.....

Like the course? Get enrolled and start learning!

Table of Contents

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible

Contents are not accessible