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class Solution: def inorderTraversal(self, root: TreeNode) -> List[int]: if not root: return [] stack = [root] res = [] while len(stack) > 0: curr_node = stack.pop() if len(stack) > 0 and stack[len(stack) - 1] is None: res.append(curr_node.val) stack.pop() else: if curr_node.right: stack.append(curr_node.right) stack.append(None) stack.append(curr_node) if curr_node.left: stack.append(curr_node.left) return res
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