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 only nodes with keys less than the node's key.Th...
分类：
其他好文 时间：
2014-08-05 09:43:39
阅读次数：
191
A method for garbage collection in a solid state drive (SSD) includes determining whether the SSD is idle by a garbage collection module of the SSD; b...
分类：
其他好文 时间：
2014-08-05 00:25:08
阅读次数：
283
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
题目：
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3....
分类：
其他好文 时间：
2014-08-03 23:29:46
阅读次数：
283
默认demo，在64bit模拟器上会link不过：target 中的 architectures 的valid architectrues里面，去掉arm64，build active architecture only： 改为no
分类：
移动开发 时间：
2014-08-03 17:50:05
阅读次数：
342
Big String
Time Limit: 2 Seconds Memory Limit: 65536 KB
We will construct an infinitely long string from two short strings: A = "^__^" (four characters), and B = "T.T" (three characters). R...
分类：
其他好文 时间：
2014-08-02 21:02:04
阅读次数：
291
Match for Bonus
Time Limit: 2 Seconds Memory Limit: 65536 KB
Roy played a game with his roommates the other day.
His roommates wrote 2 strings of characters, and gave each character a b...
分类：
其他好文 时间：
2014-08-02 18:20:33
阅读次数：
256
题目：下列操作Change operations:0 a b change all characters into '0's in [a , b]1 a b change all characters into '1's in [a , b]2 a b change all '0's into...
分类：
其他好文 时间：
2014-08-02 15:06:23
阅读次数：
266
题目：Given a string containing only digits, restore it by returning all possible valid IP address combinations.For example:Given "25525511135",return [....
分类：
编程语言 时间：
2014-08-02 09:49:53
阅读次数：
287
Longest Valid ParenthesesGiven a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substr...
分类：
其他好文 时间：
2014-08-02 04:22:40
阅读次数：
248
