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How to find the kth largest element in an unsorted array of length n in O(n)?
...not very good.
Everything you need is in these powerpoint slides. Just to extract the basic algorithm of the O(n) worst-case algorithm (introselect):
Select(A,n,i):
Divide input into ⌈n/5⌉ groups of size 5.
/* Partition on median-of-medians */
medians = array of each group’s med...
Is there a TRY CATCH command in Bash
... writing a shell script and need to check that a terminal app has been installed. I want to use a TRY/CATCH command to do this unless there is a neater way.
...
How do you write tests for the argparse portion of a python module? [closed]
...turn parser.parse_args(args)
Then in your main function you should just call it with:
parser = parse_args(sys.argv[1:])
(where the first element of sys.argv that represents the script name is removed to not send it as an additional switch during CLI operation.)
In your tests, you can then call...
Specifying column name in a “references” migration
...eferences :col_name, references: other_table_name works without installing extra gems.
– Qqwy
Sep 9 '19 at 14:26
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Difference between abstract class and interface in Python
... @L.DeLeo - are you sure your notion of has-a vs. is-a is correct? I generally view the distinction as has-a = member variable vs. is-a = inheritance (parent class or interface). Think Comparable or List in Java; those are is-a relationships, regardless of whether they're interfaces or abstract cl...
What is the difference between join and merge in Pandas?
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pandas.merge() is the underlying function used for all merge/join behavior.
DataFrames provide the pandas.DataFrame.merge() and pandas.DataFrame.join() methods as a convenient way to access the capabilities of pandas.merge(). For example, df1.merge(right=df2, ...) is equiva...
How to check visibility of software keyboard in Android?
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Some keyboards, some of the time, have an extra row of custom keys on top (for instance, predicted words). These are apparently not part of the keyboard itself, since using the getLastKeyboardHeightInPx() does not include the height of that row. Do you know of a way ...
Fastest way to get the first object from a queryset in django?
...eturn None if there aren't any. There are lots of ways to do this which all work. But I'm wondering which is the most performant.
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...mp 或其 TCHAR 版本 _tcscmp 的模板特化：
// specialization for strings
template<>
int compare<LPCTSTR>(LPCTSTR s1, LPCTSTR s2)
{
return _tcscmp(s1, s2);
}
没错，这样做完全正确，现在的问题是：将这个特化放在何处？显然是要放在模板的头文件中...
How to wait for a keypress in R?
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This answer is similar to that of Simon's, but does not require extra input other than a newline.
cat("Press Enter to continue...")
invisible(scan("stdin", character(), nlines = 1, quiet = TRUE))
Using nlines=1 instead of n=1, the user can simply press enter to continue the Rscript.
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