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Solving “Who owns the Zebra” programmatically?
...hite Swede dog beer Blue Master
It takes 0.6 seconds (CPU 1.5GHz) to find the solution.
The answer is "German owns zebra."
To install the constraint module via pip:
pip install python-constraint
To install manually:
download:
$ wget https://pypi.python.org/packages/s...
Is System.nanoTime() completely useless?
... code that uses nanoTime() for timed blocking, interval waiting, timeouts, etc. should preferably treat negative time differences (timeouts) as zeros rather than throw exceptions. This practice is also preferable because it is consistent with the behaviour of all timed wait methods in all classes in...
Favourite performance tuning tricks [closed]
...bles
Build with triggers on the underlying tables
Build daily / hourly / etc.
Build ad-hoc
Build incrementally or teardown / rebuild
See what the query plan is with SET SHOWPLAN ON
See what’s actually happenning with SET STATS IO ON
Force an index using the pragma: (index: myindex)
Force th...
How exactly does the callstack work?
...de a frame appropriately to optimize their alignment so the processor can fetch them as quickly as possible. The crucial fact is that the offset of the variables relative to some fixed address is constant throughout the lifetime of the frame - so it suffices to take an anchor address, say, the addre...
Tools for analyzing performance of a Haskell program
...al user, 97.6% of total elapsed
./A +RTS -s 13.26s user 0.05s system 98% cpu 13.479 total
Which already gives us a lot of information: you only have a 2M heap, and GC takes up 0.8% of time. So no need to worry that allocation is the problem.
Time Profiles
Getting a time profile for your progra...
逆向工程——二进制炸弹(CSAPP Project) - 操作系统(内核) - 清泛网 - 专注...
...个字符串。那么，找到这个内存地址中的字符串便能解决问题了。那么如何去寻找呢，于是乎我又翻看我的那几十页代码纸，企图人工计算出来。后来发现数据段的的值没有包含。终于，我开始想到了gdb这个工具。干嘛不在0x8048...
Wi-Fi 是什么的缩写 - 程序人生、谈天论地 - 清泛IT论坛，有思想、有深度
...试产品是否符合标准，导致 802.11 产品间的互通频频出现问题，而联盟的成立就是为了填补这一空缺。联盟还将推广符合 802.11 标准的无线网络技术作为己任，因此他们认为需要一个朗朗上口的名字来代替拗口的专业术语（呃…...
Is It Possible to Sandbox JavaScript Running In the Browser?
...ited to iframe granularity.
In general, no degree of regular expressions, etc. can safely sanitise arbitrary user provided JavaScript as it degenerates to the halting problem :-/
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惨不忍睹：说一说你最穷的时候是什么样子 - 创意 - 清泛网 - 专注C/C++及内核技术
...话说，一分钱难倒英雄汉，有的时候没钱真的很难。那么问题来了，...
每个人的一生中都会和金钱打交道，每个人也都会遇到囊中羞涩的时候。俗话说，一分钱难倒英雄汉，有的时候没钱真的很难。那么问题来了，你最穷...
How do I enable file editing in Visual Studio's debug mode?
... file. The next action which continues execution of the program (F10, F5, etc ...) will cause the edits to be applied to the running program. If this succeeds the execution of the program will continue with the new code applied.
The debugger does not allow edits to the file if ENC is not enabled....