Breadth-First Search pattern
Zigzag Level Order
Given the root of a binary tree, return its zigzag level-order traversal: collect node values level by level, alternating direction left-to-right then right-to-left on each successive level. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 103
- Medium
- 1 approach
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Breadth-First SearchLeetCode 103
Medium
The approach
- 01 BFS + direction flag O(n)O(width) space
What you will learn
- How to read Zigzag Level Order and spot the breadth-first search pattern in it
- BFS + direction flag: O(n) time, O(width) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Breadth-First Search
See Zigzag Level Order run, step by step
Sign in and this page opens on the animation, with all 8 Breadth-First Search problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.