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....
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其他好文 时间:
2014-07-14 00:20:06
阅读次数:
323
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;
* ...
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其他好文 时间:
2014-07-13 16:32:04
阅读次数:
152
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:...
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其他好文 时间:
2014-07-12 23:50:41
阅读次数:
354
Antenna Placement
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 6334
Accepted: 3125
Description
The Global Aerial Research Centre has been allotted the...
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其他好文 时间:
2014-07-12 23:03:24
阅读次数:
222
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...
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编程语言 时间:
2014-07-12 23:02:43
阅读次数:
369
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...
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数据库 时间:
2014-07-12 21:40:22
阅读次数:
260
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...
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其他好文 时间:
2014-07-12 20:27:31
阅读次数:
263
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...
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其他好文 时间:
2014-07-12 19:32:57
阅读次数:
553
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...
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其他好文 时间:
2014-07-12 19:31:32
阅读次数:
190
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...
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其他好文 时间:
2014-07-12 19:07:08
阅读次数:
181