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Fast permutation -> number -> permutation mapping algorithms
I have n elements. For the sake of an example, let's say, 7 elements, 1234567. I know there are 7! = 5040 permutations possible of these 7 elements.
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List all tables in postgresql information_schema
What is the best way to list all of the tables within PostgreSQL's information_schema?
8 Answers
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MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...据说带着问题学习更有效，那就先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
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How to select between brackets (or quotes or …) in Vim?
I'm sure there used to be a plugin for this kinda stuff, but now that I need it, I can't seem to find it (naturally), so I'll just ask nice and simple.
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Why doesn't logcat show anything in my Android?
Why doesn't logcat show anything in my Android (while developing apps with Eclipse)?
27 Answers
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Heroku deployment error H10 (App crashed)
I have a RoR app working on my local computer, but when I send it to heroku, it crashes. The error log gives an error H10 & says:
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convert a list of objects from one type to another using lambda expression
I have a foreach loop reading a list of objects of one type and producing a list of objects of a different type. I was told that a lambda expression can achieve the same result.
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How do you copy and paste into Git Bash
I'm using msysgit running on Windows XP.
30 Answers
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Determine whether JSON is a JSONObject or JSONArray
...ceof JSONArray)
//you have an array
tokenizer is able to return more types: http://developer.android.com/reference/org/json/JSONTokener.html#nextValue()
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Check if character is number?
I need to check whether justPrices[i].substr(commapos+2,1) .
22 Answers
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