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Zigzag Order Traversal of a Binary Tree

Python/Codingeasy0.3 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Meesho
Expert AnswerPremium
64 wordsInterview-ready
**BFS with level.** Every other level, reverse before appending. Or use deque: popleft vs pop for direction. O(n). def zigzag(root): if not root: return [] res, q, ltr = [], [root], True while q: level = [] for _ in range(len(q)): n = q.pop(0) level.append(n.val) if n.left: q.append(n.left) if n.right: q.append(n.right) res += level if ltr else level[::-1] ltr = not ltr return res
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