有一棵二叉树,如下图所示: 其中 # 表示空结点. 先序遍历:A B D E G C F 问题:怎么得到从根结点到任意结点的路径呢? 示例:输入 G,怎么得到从结点 A 到结点 G 的路径呢? 很明显,我们一眼就能看出来路径是 A B E G.如何通过程序得到这条路径就是我们接下来需要做的. 定义二叉树的 链式存储结构 如下: typedef struct BiTNode { char data; struct BiTNode* lchild, * rchild; }BiTNode, * BiT
144. Binary Tree Preorder Traversal Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree [1,null,2,3], 1 \ 2 / 3 return [1,2,3]. Note: Recursive solution is trivial, could you do it iteratively? # De
We are given a binary tree (with root node root), a target node, and an integer value K. Return a list of the values of all nodes that have a distance K from the target node. The answer can be returned in any order. Example 1: Input: root = [3,5,1,6