Leetcode 102. Binary Tree Level Order Traversal
Return the values of a binary tree grouped by depth, from left to right for each level (i.e., a level-order / breadth-first traversal). For an empty tree return an empty list.
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Early June, 2026
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level order traversal and out put in the format of treenode follow up, give in out put in the format of list of list.
Early August, 2025
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Late January, 2025
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