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LeetCode 28 Divide Two Integers
Divide two integers without using multiplication, division and mod operator. 思路:1.先将被除数和除数转化为long的非负数,注意一定要为long,因为Integer.MIN_VALUE的绝对值超出了Integer的范围。           2.常理:任何正整数num都可以表示为num=2^a+2^b+2^c+.....
分类:其他好文   时间:2014-06-25 19:46:17    阅读次数:246
Peterson和多线程版本
Peterson's algorithm (AKA Peterson's solution) is a concurrent programming algorithm for mutual exclusion that allows two processes to share a single-use resource without conflict, using only shar...
分类:编程语言   时间:2014-06-25 19:38:19    阅读次数:748
Android开发环境搭建时遇到问题的解决方法
Android开发环境搭建时遇到问题的解决方法  错误1: The connection to adb is down, and a severe error has occured. [2013-08-31 16:11:56 -com.qihoo.subject] You must restart adb and Eclipse. [2013-08-31 16:11:56...
分类:移动开发   时间:2014-06-24 23:51:52    阅读次数:514
LeetCode——Single Number
Given an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without using e...
分类:其他好文   时间:2014-06-24 23:30:08    阅读次数:278
LeetCode: Best Time to Buy and Sell Stock III [123]
【题目】 Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at most two transactions. Note: You may not engage in multiple transactions at the same time (i...
分类:其他好文   时间:2014-06-24 23:28:43    阅读次数:223
ubuntu下配置rails环境遇到的错误
1.Could not find gem 'sqlite3 (>= 0)' in any of the gem sources listed in you r Gemfile 2.ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions into the /usr/local/lib/ruby/gems/1.9.1 director.y 3.rails 3遇到 Could n...
分类:其他好文   时间:2014-06-24 22:18:45    阅读次数:316
LeetCode :: Reorder List
Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You must do this in-place without altering the nodes' values. For example, Given {1,2,3,4}, reorder it t...
分类:其他好文   时间:2014-06-24 21:55:30    阅读次数:279
极简AWR报告收集指导
1.以oracle用户登录oracle数据库,执行如下命令登录数据库: sqlplus / as sysdba 2.运行如下命令: @?/rdbms/admin/awrrpt.sql 3.出现如下信息时,直接回车(默认HTML格式) Would you like an HTML report, or a plain text report? 4.出现如下信息时,直接回车 Enter ...
分类:其他好文   时间:2014-06-24 21:30:53    阅读次数:226
字符串 赋值 以及gets
我们知道字符串用字符数组或用指针实现,可是在赋值的时候产生了不少疑惑 用法一: char a[ ]={"I LOVE YOU!"}; 可是下面这样就是错的: char a[20]; a={"I LOVE YOU!"}; 用法二: char a[]="I LOVEYOU"; 用法三: char *a="I LOVE YOU" 用法四:针对一中的错误用法,可用str...
分类:其他好文   时间:2014-06-24 19:10:31    阅读次数:397
LeetCode: Valid Palindrome [125]
【题目】 Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a canal: Panama" is a palindrome. "race a car" is not a palindrome. Note: Have you consider that the string m...
分类:其他好文   时间:2014-06-24 15:35:07    阅读次数:150
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