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【scrapy】Item Pipeline
After an item has been scraped by a spider,it is sent to the Item Pipeline which process it through several components that are executed sequentially....
分类:其他好文   时间:2014-07-14 00:20:06    阅读次数:323
Linked List Cycle
Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? /** * Definition for singly-linked list. * class ListNode { * int val; * ...
分类:其他好文   时间:2014-07-13 16:32:04    阅读次数:152
解决alaert.builder二次调用报错的bug
报错的代码是: The specified child already has a parent. You must call removeView() on the child's parent first 大致是说你的弹出框中的view已经绑定了一个paren,就是你的弹出框。当你再次调用显示的时候,他以为你又要绑定到一个新的窗口上去。解决的方法是每次显示之前都重新填充设置view.如下:...
分类:其他好文   时间:2014-07-12 23:50:41    阅读次数:354
POJ 3020:Antenna Placement(无向二分图的最小路径覆盖)
Antenna Placement Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6334   Accepted: 3125 Description The Global Aerial Research Centre has been allotted the...
分类:其他好文   时间:2014-07-12 23:03:24    阅读次数:222
Effective C++ Item 38 通过复合塑模出 has-a 或 is-implemented-in-terms-of
经验:在应用域,复合意味着 has-a。 在实现域,复合意味着 is-implemented-in-terms-of 示例: template //将list应用于 Set。错误做法 class Set: public std::list {...}; 解析: public 继承表示 is-a,即如果D是一种B,对B为真的每一件事,对D也应该为真。但list可以包含相同的元素,而Set不可以 纠正: template class Set{ publi...
分类:编程语言   时间:2014-07-12 23:02:43    阅读次数:369
The connection to adb is down, and a severe error has occured. 问题解决
启动android模拟器时.有时会报The connection to adb is down, and a severe error has occured.的错误.在网友说在任务管理器上把所有adb.exe关闭掉.重启eclipse.但试过不管用.所以在外国网站上找到一种可行的方法: 1.先把eclipse关闭. 2.在管理器转到你的android SDK 的platform-to...
分类:数据库   时间:2014-07-12 21:40:22    阅读次数:260
NYOJ-248 BUYING FEED
BUYING FEED 时间限制:3000 ms  |  内存限制:65535 KB 难度:4 描述 Farmer John needs to travel to town to pick up K (1 D*K cents. The county feed lot has N (1 location X_i (0 < X_i John as much as F_i (1 A...
分类:其他好文   时间:2014-07-12 20:27:31    阅读次数:263
previous operation has not finished
svn提交遇到恶心的问题,可能是因为上次cleanup中断后,进入死循环了。 错误如下:   解决方法:清空svn的队列 1.下载sqlite3.exe    2.找到你项目的.svn文件,查看是否存在wc.db 3.将sqlite3.exe放到.svn的同级目录 4.启动cmd执行sqlite3 .svn/wc.db "select * from...
分类:其他好文   时间:2014-07-12 19:32:57    阅读次数:553
POJ 2386 Lake Counting
Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 19591   Accepted: 9848 Description Due to recent rains, water has pooled in various places in...
分类:其他好文   时间:2014-07-12 19:31:32    阅读次数:190
POJ 3020 Antenna Placement
Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6342 Accepted: 3131 Description The Global Aerial Research Centre has been allotted the task of building the fi...
分类:其他好文   时间:2014-07-12 19:07:08    阅读次数:181
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