Class Solution
java.lang.Object
g0001_0100.s0094_binary_tree_inorder_traversal.Solution
94 - Binary Tree Inorder Traversal\.
Easy
Given the `root` of a binary tree, return _the inorder traversal of its nodes' values_.
**Example 1:**

**Input:** root = [1,null,2,3]
**Output:** [1,3,2]
**Example 2:**
**Input:** root = []
**Output:** []
**Example 3:**
**Input:** root = [1]
**Output:** [1]
**Example 4:**

**Input:** root = [1,2]
**Output:** [2,1]
**Example 5:**

**Input:** root = [1,null,2]
**Output:** [1,2]
**Constraints:**
* The number of nodes in the tree is in the range `[0, 100]`.
* `-100 <= Node.val <= 100`
**Follow up:** Recursive solution is trivial, could you do it iteratively?
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptioninorderTraversal
(TreeNode root) void
inorderTraversal
(TreeNode root, List<Integer> answer)
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Constructor Details
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Solution
public Solution()
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Method Details
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inorderTraversal
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inorderTraversal
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