String
Problem Description
Recently, lxhgww received a task : to generate strings contain '0's and '1's only, in which '0' appears exactly m times, '1' appears exactly n times. Also, any prefix ...
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其他好文 时间:
2014-11-11 21:10:17
阅读次数:
520
Crossed MatchingsTime Limit: 2 Seconds Memory Limit: 65536 KBThere are two rows of positive integer numbers. We can draw one line segment between any....
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其他好文 时间:
2014-11-11 18:49:49
阅读次数:
199
Clojure’s :pre and :post
:pre 和:post是clojure提供的两个断言功能。
:pre在函数调用之前检查参数是否符合条件。
:post在函数调用之后检查返回值是否符合条件。
例:
(defn pos-add [& args]
{:pre [(not-any? neg? args)]
:post [(
(apply + a...
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其他好文 时间:
2014-11-11 16:37:40
阅读次数:
185
问题描述:我的电脑本来是Ubuntu+win7双系统,自己前天想换成win64位,于是就安装系统,结果装好了之后开机进入grub选择win7之后,屏幕显示no such device:press any key to continue...如果随便按任何键也能进入系统,但是还是觉得不太好看分析:这次...
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其他好文 时间:
2014-11-11 10:38:40
阅读次数:
203
可以用mac 自带的转发规则 查看当前 ipfw 规则: sudo ipfw show 所有 8080 端口转发的消息全部转发到80端口 解决 1024 一下端口问题 sudo ipfw add 100 fwd 127.0.0.1,8080 tcp from any to any 80 in...
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系统相关 时间:
2014-11-10 21:59:00
阅读次数:
234
1.Given a rectangular (cuboidal for the puritans) cake with a rectangular piece removed (any size or orientation), how would you cut the remainder of ...
-------运算符---------一元运算符--正号+,负号-,负号使用的时候最好加括号,是否容易当成减号操作--运算符的优先级第一级:乘模除* % /第二级:正负+-,加减+-第三级:>,=,,!=,!第四级:not第五级:and or between第六级:all any some in l...
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数据库 时间:
2014-11-09 23:30:27
阅读次数:
413
Problem Description
CC always becomes very depressed at the end of this month, he has checked his credit card yesterday, without any surprise, there are only 99.9 yuan left. he is too distressed an...
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其他好文 时间:
2014-11-09 16:42:48
阅读次数:
131
Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your previous solution stil...
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其他好文 时间:
2014-11-08 11:43:47
阅读次数:
190
Given a binary tree, find the maximum path sum.The path may start and end at any node in the tree. For example:Given the below binary tree, 1 ...
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其他好文 时间:
2014-11-08 08:11:54
阅读次数:
244