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94. Binary Tree Inorder Traversal

Easy


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

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Example 1:

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Input: root = [1,null,2,3]

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Output: [1,3,2]

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Explanation:

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Example 2:

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Input: root = [1,2,3,4,5,null,8,null,null,6,7,9]

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Output: [4,2,6,5,7,1,3,9,8]

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Explanation:

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Example 3:

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Input: root = []

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Output: []

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Example 4:

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Input: root = [1]

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Output: [1]

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Constraints:

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+Follow up: Recursive solution is trivial, could you do it iteratively? \ No newline at end of file