1.首先我们的目的是长期监听时间变化，其实应用程序退出。
通过了解我们知道注册ACTION_TIME_TICK广播接收器可以监听系统事件改变，但是
查看SDK发现ACTION_TIME_TICK广播事件只能动态注册：
Broadcast Action: The current time has changed. Sent every minute. You can not receive t...
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移动开发 时间：
2014-06-05 08:35:13
阅读次数：
285
【题目】
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 from left to right.
The first integer of each row is greater than the last integer of the previous ...
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其他好文 时间：
2014-06-05 08:28:43
阅读次数：
321
Catch That Cow
Time Limit: 2000MS
Memory Limit: 65536K
Total Submissions: 43851
Accepted: 13674
Description
Farmer John has been informed of the location of a fugitiv...
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其他好文 时间：
2014-06-05 07:45:38
阅读次数：
220
链接：http://poj.org/problem?id=3259
Description
While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path t...
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其他好文 时间：
2014-06-05 05:26:33
阅读次数：
240
【题目】
Validate if a given string is numeric.
Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true
Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before imple...
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其他好文 时间：
2014-06-04 23:45:09
阅读次数：
388
【题目】
Given an array of words and a length L, format the text such that each line has exactly L characters and is fully (left and right) justified.
You should pack your words in a greedy approach; that is, pack as many words as you can in each line. Pad ...
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其他好文 时间：
2014-06-04 22:37:46
阅读次数：
389
Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point N (0 ≤ N ≤ 100,000) on a number line and the cow is at a point K (0 ≤ K ≤ 100,0...
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其他好文 时间：
2014-06-03 05:30:23
阅读次数：
394
题目：
给定一个字符串，返回该串没有重复字符的最长子串。
分析：
1）子串：子串要求是连续的。
2）无重复，出现重复就断了，必须从新的位置开始。而新的位置就是重复字符第一次出现位置的下一个位置。
3）整个串可能没有一处重复。
那么，为了找出当前访问的字符是否出现过，要怎么做呢？当然是hash，O(1)的时间，而且既然是字符， 定义个255的hash table 就可以了，has...
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其他好文 时间：
2014-06-01 10:48:31
阅读次数：
206
【题目】
Given two sorted integer arrays A and B, merge B into A as one sorted array.
Note:
You may assume that A has enough space (size that is greater or equal to m + n) to hold additional elements from B. The number of elements initialized in A and B are...
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其他好文 时间：
2014-06-01 09:21:16
阅读次数：
292
Description
T. Chur teaches various groups of students at university U. Every U-student has a unique Student Identification Number (SIN). A SIN s is an integer in the range 0 ≤ s ≤ MaxSIN with MaxS...
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其他好文 时间：
2014-06-01 07:40:18
阅读次数：
248
