As suggested by the hints, this problem is equivalent to detect a cycle in the graph represented by prerequisites. Both BFS and DFS can be used to sol...
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其他好文 时间:
2015-06-28 01:12:24
阅读次数:
252
返回上一次目录命令:cd -该命令等同于cd $OLDPWD,关于这一点在bash的手册页(可使用命令man bash访问其手册页)中有介绍:An argument of - is equivalent to $OLDPWD.并且它还会返回上一次目录的物理路径。
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系统相关 时间:
2015-06-25 12:06:19
阅读次数:
230
As of release JDK 5, this class has been supplemented with an equivalent class designed for use by a single thread, StringBuilder. The StringBuilder c...
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其他好文 时间:
2015-05-29 00:37:21
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135
this is a function that Convert uppercase letter to lowercaseConverts c to its lowercase equivalent if c is an uppercase letter and has a lowercase eq...
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其他好文 时间:
2015-05-27 15:26:16
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118
GENERATE It is another concurrent statement (along with operators and WHEN). Itis equivalent to the sequential statement LOOP in the sense that ital.....
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其他好文 时间:
2015-05-21 01:17:13
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144
Description
Consider the following exercise, found in a generic linear algebra textbook.
Let A be an n × n matrix. Prove that the following statements are equivalent:
A is invertible. Ax = b h...
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其他好文 时间:
2015-05-14 08:47:37
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111
yii2做了很多来处理request请求。这里做笔记记录一下。 1、普通的get和pst请求 $request?=?Yii::$app->request;
$get?=?$request->get();?
//?equivalent?to:?$get?=?$_GET;
$id?=?$request->get(‘...
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其他好文 时间:
2015-05-05 00:10:25
阅读次数:
1006
三、 传输过程概念细分
(一)、加密算法解析
1、WEP
1) WEP: Wired Equivalent Privacy
2) 随802.11标准提出
3) RC4加密算法
4) 2种强度:40bits和104bits
5) Initialization vector (IV) = 24 bits
6) WEP2: 128bit
2、 WPA
1) WPA:草案的IEEE80...
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其他好文 时间:
2015-04-28 16:10:36
阅读次数:
240
English daily notes 2015年 4月 Phrases 1. As a side note #作为附注,顺便说句题外话,和by the way意思相近,例句: @1:As a side note, there is no equivalent to tapply in the pl...
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其他好文 时间:
2015-04-21 22:29:23
阅读次数:
237