- 30 Days of Code
- Day 23: BST Level-Order Traversal
Today, we're going further with Binary Search Trees. Check out the Tutorial tab for learning materials and an instructional video!
A level-order traversal, also known as a breadth-first search, visits each level of a tree's nodes from left to right, top to bottom. You are given a pointer, , pointing to the root of a binary search tree. Complete the levelOrder function provided in your editor so that it prints the level-order traversal of the binary search tree.
Hint: You'll find a queue helpful in completing this challenge.
Complete the levelOrder function in the editor below.
levelOrder has the following parameter:
- Node pointer root: a reference to the root of the tree
- Print node.data items as space-separated line of integers. No return value is expected.
The locked stub code in your editor reads the following inputs and assembles them into a BST:
The first line contains an integer, (the number of test cases).
The subsequent lines each contain an integer, , denoting the value of an element that must be added to the BST.
Print the value of each node in the tree's level-order traversal as a single line of space-separated integers.
6 3 5 4 7 2 1
3 2 5 1 4 7
The input forms the following binary search tree:
We traverse each level of the tree from the root downward, and we process the nodes at each level from left to right. The resulting level-order traversal is , and we print these data values as a single line of space-separated integers.