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Is there a math nCr function in python? [duplicate]
I'm looking to see if built in with the math library in python is the nCr (n Choose r) function:
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Remove multiple spaces and new lines inside of String
Suppose we have string like this:
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Oracle取前N条记录方法 Oracle实现SELECT TOP N的方法 - 爬虫/数据库 - 清...
select * from ( select * from tablexxx order by xxx desc ) where rownum <= N
oracle数据库不支持mysql中limit, top功能,但可以通过rownum来限制返回的结果集的行数,rownum并不是用户添加的字段,而是oracle系统自动添加的。
Why Collections.sort uses merge sort instead of quicksort?
We know that quick sort is the fastest sorting algorithm.
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How would you count occurrences of a string (actually a char) within a string?
I am doing something where I realised I wanted to count how many / s I could find in a string, and then it struck me, that there were several ways to do it, but couldn't decide on what the best (or easiest) was.
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What are the applications of binary trees?
I am wondering what the particular applications of binary trees are. Could you give some real examples?
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Best Practices: working with long, multiline strings in PHP?
Note: I'm sorry if this is an extremely simple question but I'm somewhat obsessive compulsive over the formatting of my code.
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Append an object to a list in R in amortized constant time, O(1)?
If I have some R list mylist , you can append an item obj to it like so:
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Create list of single item repeated N times
I want to create a series of lists, all of varying lengths. Each list will contain the same element e , repeated n times (where n = length of the list).
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Multiple simultaneous downloads using Wget?
I'm using wget to download website content, but wget downloads the files one by one.
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