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Return the node values grouped by tree depth, but alternate the order of values on each level (left-to-right then right-to-left, and so on). This is a level-order traversal problem where you must flip the output direction for every other level.
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Leetcode 103. Binary Tree Zigzag Level Order Traversal
Reported Mar 7, 2026 · 1 source report
JUNIOR
Source snapshot: Nov 12, 2026
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Leetcode 103. Binary Tree Zigzag Level Order Traversal
Reported Aug 4, 2025 · 2 source reports
MID_LEVEL, SENIOR
Source snapshot: Nov 12, 2026
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