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Fast permutation -> number -> permutation mapping algorithms
...be very small. This can "easily" be reduced to O(nlogn) though, through an order statistics tree (pine.cs.yale.edu/pinewiki/OrderStatisticsTree), i.e. a red-black tree which initially will contains the values 0, 1, 2, ..., n-1, and each node contains the number of descendants below it. With this, on...
Finding median of list in Python
... be of any size and the numbers are not guaranteed to be in any particular order.
24 Answers
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Upgrade python packages from requirements.txt using pip command
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I suggest freezing all of your dependencies in order to have predictable builds.
When doing that, you can update all dependencies at once like this:
sed -i '' 's/==/>=/g' requirements.txt
pip install -U -r requirements.txt
pip freeze > requirements.txt
Having do...
Can you create nested WITH clauses for Common Table Expressions?
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These answers are pretty good, but as far as getting the items to order properly, you'd be better off looking at this article
http://dataeducation.com/dr-output-or-how-i-learned-to-stop-worrying-and-love-the-merge
Here's an example of his query.
WITH paths AS (
SELECT
Employ...
Removing duplicate objects with Underscore for Javascript
... array of strings. Also, if you add b values to the uniques and invert the order of a/b they are no longer considered unique by your function. (e.g. `"{\"a\":\"1\",\"b\":2}" != "{\"b\":2,\"a\":\"1\"}") Maybe im missing something, but shouldn't the result at least be useful? Here is a jsbin to illust...
What's the point of 'const' in the Haskell Prelude?
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It's useful for passing to higher-order functions when you don't need all their flexibility. For example, the monadic sequence operator >> can be defined in terms of the monadic bind operator as
x >> y = x >>= const y
It's somewhat neater...
How do I generate random integers within a specific range in Java?
...le value in the range [0,1). Notice this range does not include the 1.
In order to get a specific range of values first, you need to multiply by the magnitude of the range of values you want covered.
Math.random() * ( Max - Min )
This returns a value in the range [0,Max-Min), where 'Max-Min' is...
How to efficiently build a tree from a flat structure?
...ntID property so they can be arranged in trees. They are in no particular order.
Each ParentID property does not necessarily matches with an ID in the structure. Therefore their could be several trees emerging from these objects.
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Importing a CSV file into a sqlite3 database table using Python
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This code is not optimized for very large csv files (order of GBs)
– Nisba
Jul 26 '19 at 11:00
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show 5 more comments
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Have the same README both in Markdown and reStructuredText
... on GitHub. For this I have written my README using the Markdown syntax in order to have it nicely formatted on GitHub.
8 A...