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[LeetCode] Convert Sorted List to Binary Search Tree(分治)
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.方法:为了使BST高度平衡,要找链表中的中值作为当前根节点。/** * Defin...
分类:其他好文   时间:2014-08-04 20:37:47    阅读次数:194
Symmetric Tree
问题:判断二叉树是否为镜像二叉树分析:递归判断,根节点单独判断,然后递归左结点和右结点,之后每次一起递归左结点的左结点和右结点的右结点比较,左结点的右结点和右结点的左结点比较/** * Definition for binary tree * struct TreeNode { * int ...
分类:其他好文   时间:2014-08-04 17:27:27    阅读次数:175
[LeetCode] Flatten Binary Tree to Linked List
Given a binary tree, flatten it to a linked list in-place.For example, Given 1 / \ 2 5 / \ \ 3 4 6The flattened ...
分类:其他好文   时间:2014-08-04 16:59:37    阅读次数:246
Validate Binary Search Tree leetcode java
题目:Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains on....
分类:编程语言   时间:2014-08-04 13:57:17    阅读次数:242
Unique Binary Search Trees
问题:n个结点总共有多少个二叉搜索树分析:n=1,sum1=1 n=2,sum2=2; n=3,sum3=2(头结点为1)+1(头结点为2)+2(头结点为3) n=4,sum4=5(头结点为1,sum3)+2(头结点为2,sum1*sum2)+2(头结点为3,sum2*sum1)+...
分类:其他好文   时间:2014-08-04 13:53:47    阅读次数:193
Balanced Binary Tree
问题:判断二叉树是否为平衡二叉树分析:树上的任意结点的左右子树高度差不超过1,则为平衡二叉树。 搜索递归,记录i结点的左子树高度h1和右子树高度h2,则i结点的高度为max(h1,h2)=1,|h1-h2|>1则不平衡/** * Definition for binary tree * str...
分类:其他好文   时间:2014-08-04 13:39:57    阅读次数:183
[LeetCode] Populating Next Right Pointers in Each Node II
Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your previous solution stil...
分类:其他好文   时间:2014-08-04 13:32:57    阅读次数:184
Populating Next Right Pointers in Each Node II leetcode java
题目:Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your previous solution ....
分类:编程语言   时间:2014-08-04 10:31:57    阅读次数:239
Add Binary Leetcode java
题目:Given two binary strings, return their sum (also a binary string).For example,a = "11"b = "1"Return "100".题解:二进制加法都是从最低位(从右加到左)。所以对两个字符串要从最后一位开始加,....
分类:编程语言   时间:2014-08-04 06:13:36    阅读次数:291
Gray Code leetcode java
题目:The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integer n representing the total ....
分类:编程语言   时间:2014-08-04 04:10:46    阅读次数:309
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