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Binary Tree Postorder Traversal

Hard

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Given a binary tree, return the postorder traversal of its nodes' values.

Sample Input:

[1,null,2,3]

Sample Output:

[3,2,1]

Hints

Hint 1

Use iterative approach with stack

Hint 2

Track visited nodes to avoid reprocessing

Hint 3

Process left, right, then root

Code Editor

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