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Binary Tree Inorder Traversal

Problem URL:Binary Tree Inorder Traversal

My Solution:

# Recursive Approach

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right

def inorderTraversal(root: Optional[TreeNode]) -> List[int]:
    if not root:
        return []

    return [*inorderTraversal(root.left), root.val, *inorderTraversal(root.right)]

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