# Functions
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InOrderWalk MarkIt 非递归,二叉树,中序遍历.
PostOrderWalk MarkIt 非递归,二叉树,后序遍历.
PreOrderWalk MarkIt 非递归,二叉树,前序遍历.
# Structs
SegmentTree not all the fields are needed, follow definition is a self-contained demonstration.
TreeNode # binary tree.