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Quicksort vs heapsort
...paper has some analysis.
Also, from Wikipedia:
The most direct competitor of
quicksort is heapsort. Heapsort is
typically somewhat slower than
quicksort, but the worst-case running
time is always Θ(nlogn). Quicksort is
usually faster, though there remains
the chance of worst case p...
Writing string to a file on a new line every time
I want to append a newline to my string every time I call file.write() . What's the easiest way to do this in Python?
10 A...
How to version control a record in a database
...queries against the FOO table. Happy days.
Then, I would create a FOO_HISTORY table. This has all the columns of the FOO table. The primary key is the same as FOO plus a RevisionNumber column. There is a foreign key from FOO_HISTORY to FOO. You might also add columns related to the revision su...
How do I parse a string to a float or int?
In Python, how can I parse a numeric string like "545.2222" to its corresponding float value, 545.2222 ? Or parse the string "31" to an integer, 31 ?
...
How do I fix the indentation of an entire file in Vi?
In Vim, what is the command to correct the indentation of all the lines?
16 Answers
16...
Does Spring @Transactional attribute work on a private method?
...unctionality provided by Spring (like @Transactional) will only be taken into account if the call goes through the proxy. -- This is normally the case if the annotated method is invoked from another bean.
This has two implications:
Because private methods must not be invoked from another bean (the ...
Is there a way to iterate over a range of integers?
...ge can iterate over maps and slices, but I was wondering if there is a way to iterate over a range of numbers, something like this:
...
Does a const reference class member prolong the life of a temporary?
...ializers of reference declarations. The reference in your example is bound to the constructor's argument n, and becomes invalid when the object n is bound to goes out of scope.
The lifetime extension is not transitive through a function argument. §12.2/5 [class.temporary]:
The second context i...
how to find host name from IP with out login to the host
i need to find the host name of a UNIX host whose IP is known with out login to that UNIX host
11 Answers
...
What is the difference D3 datum vs. data?
...
I found the correct answer here from Mike himself:
D3 - how to deal with JSON data structures?
If you want to bind your data to a single SVG element, use
(...).data([data])
or
(...).datum(data)
If you want to bind your data to multiple SVG elements
(...).data(data).enter().ap...