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 extra memory?
给定一个整数数组，除一个元素只出现一次外，其余各元素均出现两次。找出那个只出现一次的元素。
注意 ...
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.
Return a deep copy of the list.
给定一个链表，其中的节点包含一个额外的随机指针，可能指向链表中的任意一个节点或者为空。
返回链表的深拷贝。
解法I ...
Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, - and *.
Example 1
Input: "2-1-1".
((2-1)-1) = 0 (2-(1-1 ...
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties:
Integers in each row are sorted in ascending from left to right.
Integers in each column are sorted ...
SAE新近开放的实时日志API允许开发者通过HTTP GET方式从SAE服务器获取应用日志，从而实现在线的应用调试与分析。
SAE日志API的URL请求格式为：GET /log/(string: service)/(string: date)/(string: ident).log?(string: fop)
参数列表中：
date表示日志的日期，格式为yyyy-MM-dd
service为SAE提供的各项服务，包括http，taskqueue（任务队列），cron（定时任务），mail（邮件），rdc（关系型数据库集群），storage（存储），push（推送）以及fetchurl（URL抓取），相信熟悉SAE的开发者不会对此感到陌生。
ident表示相应服务下的日志类型 ...