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leetcode 105. Construct Binary Tree from Preorder and Inorder Traversal
递归解法: 从先序遍历中得到树的根节点,从中序遍历中得到左右数的组成节点。 更好理解的解法: ...
分类:其他好文   时间:2017-08-19 11:05:37    阅读次数:130
[Coding Made Simple] Count Number of Binary Tree Possible given Preorder Sequence
Count Number of Binary Tree Possible given Preorder Sequence. For example, given preorder sequence of {10, 11, 9, 12, 13, 14}, the total possible numb ...
分类:其他好文   时间:2017-08-18 15:24:19    阅读次数:163
树——binary-tree-postorder-traversal(树的前序遍历)
问题: Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree{1,#,2,3}, return[1,2,3]. 递归方法: 非递归方法(利用栈): ...
分类:其他好文   时间:2017-08-18 11:06:35    阅读次数:118
[leetcode]105. Construct Binary Tree from Preorder and Inorder Traversal
Given preorder and inorder traversal of a tree, construct the binary tree. Note:You may assume that duplicates do not exist in the tree. 根据二叉树的前序遍历和中序 ...
分类:其他好文   时间:2017-08-10 22:40:08    阅读次数:146
难1 297. Serialize and Deserialize Binary Tree
ote最高的PreOrder Traversal (Recursion)做法 本题别人用了双向队列 Deque, 注意23-24行,写的非常好 另外再注意一下29行的语法,nodes就是指向这个linkedlist的,所以linkedlist再怎么删,nodes始终指向linkedlist,而不是l ...
分类:其他好文   时间:2017-08-08 11:00:42    阅读次数:157
606. Construct String from Binary Tree
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 rep ...
分类:其他好文   时间:2017-08-07 20:33:41    阅读次数:142
331. Verify Preorder Serialization of a Binary Tree
找规律? 我们通过举一些正确的例子,比如"9,3,4,#,#,1,#,#,2,#,6,#,#" 或者"9,3,4,#,#,1,#,#,2,#,6,#,#"等等,可以观察出如下两个规律: 1. 数字的个数总是比#号少一个 2. 最后一个一定是#号 那么我们加入先不考虑最后一个#号,那么此时数字和#号的 ...
分类:其他好文   时间:2017-08-07 19:26:58    阅读次数:135
Binary Tree Preorder Traversal -- leetcode
Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3 return [1,2,3]. Note: Rec ...
分类:其他好文   时间:2017-08-04 21:32:16    阅读次数:136
Binary tree preorder traversal
不同的方法, 递归出口, 加入结果容器的顺序和递归的顺序 遍历 递归调用: 分治法 分治法的步骤, 递归出口, 先分-> 操作, 再合->操作, 返回 ...
分类:其他好文   时间:2017-07-26 00:09:32    阅读次数:162
[Leetcode] Binary tree-- 606. Construct String from Binary Tree
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 rep ...
分类:其他好文   时间:2017-07-22 11:00:41    阅读次数:165
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