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LeetCode: Search a 2D Matrix [074]
【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 ...
分类:其他好文   时间:2014-06-05 08:28:43    阅读次数:321
【Linux驱动】文件描述符以及相关知识
1、文件描述符 Linux操作系统中,几乎所有的设备都被抽象成为设备文件。因此,当我们想对设备进行操作的时候可以直接去操作其相应的设备文件。设备文件即是文件,要想对文件进行操作,无非就是:打开文件、关闭文件、写入数据、读出数据等,它们分别对应的函数有open(),close(),write(),read(),就以其中的open()函数做一个分析。open函数的作用是打开一个文件。 (1)它的定...
分类:系统相关   时间:2014-06-05 06:17:45    阅读次数:389
TCP源码分析--tcp_write_xmit
版本:2.6.33.4 发送端 tcp_write_xmit 函数 /* This routine writes packets to the network. It advances the * send_head. This happens as incoming acks open up the remote * window for us. * * LARGESEND no...
分类:其他好文   时间:2014-06-05 04:15:28    阅读次数:236
IntentService实现下载
?? IntentService is a base class for Services that handle asynchronous requests (expressed as Intents) on demand. Clients send requests through startService(Intent) calls; the service is starte...
分类:其他好文   时间:2014-06-05 03:03:46    阅读次数:262
每日算法之二十:Generate Parentheses
Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: "((()))", "(()())", "(())()", "()(())", "()()...
分类:其他好文   时间:2014-06-05 02:15:14    阅读次数:262
Linux filesystem structures.
1. / – RootEvery single file and directory starts from the root directory.Only root user has write privilege under this directory.Please note that /ro...
分类:系统相关   时间:2014-06-04 20:04:22    阅读次数:416
Same Tree
Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical an...
分类:其他好文   时间:2014-06-04 18:37:18    阅读次数:277
ffmpeg av_interleaved_write_frame Operation not permitted
今天在使用ffmpeg时出现了Operation not permitted通过增加打印信息发现是在av_interleaved_write_frame出现的问题,昨天还没出现这个问题,很奇怪,就把昨天的拿过来试还是一样,最后发现时少加了O_CREAT昨天没事是因为之前那个文件存在,Linux基础太...
分类:其他好文   时间:2014-06-03 07:11:24    阅读次数:380
LeetCode: Search in Rotated Sorted Array II [081]
【题目】 Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 【题意】 在“Search in Rotated Sorted Array”的基...
分类:其他好文   时间:2014-06-03 01:55:38    阅读次数:173
SRM 622 div1 250
Problem StatementIn the Republic of Nlogonia there are N cities. For convenience, the cities are numbered 0 through N-1. For each two different cities...
分类:其他好文   时间:2014-05-31 00:47:40    阅读次数:364
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