You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be represented by empty parenthesis pair "()". And you need to omit all the empty parenthesis pairs t
题目: You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be represented by empty parenthesis pair "()". And you need to omit all the empty parenthesis pai
介绍 深度优先遍历:从根节点出发,沿着左子树方向进行纵向遍历,直到找到叶子节点为止.然后回溯到前一个节点,进行右子树节点的遍历,直到遍历完所有可达节点为止. 广度优先遍历:从根节点出发,在横向遍历二叉树层段节点的基础上纵向遍历二叉树的层次. DFS实现: 数据结构:栈 父节点入栈,父节点出栈,先右子节点入栈,后左子节点入栈.递归遍历全部节点即可 BFS实现: 数据结构:队列 父节点入队,父节点出队列,先左子节点入队,后右子节点入队.递归遍历全部节点即可 树的实现 public class Tre
You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be represented by empty parenthesis pair "()". And you need to omit all the empty parenthesis pairs t