val);preorderrecur(treenode.left);preorderrecur(treenode.
tree 的读取方式主要包括四种:preorder traversal (root - left
核心,由root与left,right的相对顺序决定了遍历的顺序,你看:preorder
非递归进行前中后序遍历(使用栈)题目描述:list preordertraversal
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