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# 94. Binary Tree Inorder Traversal
"""
given the root of a binary tree, return the inorder traversal of its nodes
values
"""
# Definition for a binary tree node.
class TreeNode(object):
def __init__(self, val=0, left=None, right=None):
self.val = val
self.left = left
self.right = right
class Solution(object):
def inorderTraversal(self, root):
"""
:type root: TreeNode
:rtype: List[int]
"""
def travel(root, result):
if root != None:
travel(root.left, result)
result.append(root.val)
travel(root.right, result)
ans = []
travel(root, ans)
return ans
if __name__ == "__main__":
obj = Solution()
print(obj.inorderTraversal([1, 0, 2, 3]))
print(obj.inorderTraversal([]))
print(obj.inorderTraversal([1]))
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