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How to efficiently compare two unordered lists (not sets) in Python?
... and clearly I drew a blank. After extensive testing in python 3 with the timeit module, sorted consistently comes out faster on lists of integers. On lists of, 1k items, about 1.5% slower and on short lists, 10 items, 7.5% slower. Thoughts?
– arctelix
Oct ...
What is the best Battleship AI?
... on my test machine (a ULV Celeron netbook) this code loses by timeout consistently. When I let it take all the time it wants it whips Simple (roughly 90% success rate). If you are relying heavily on the spec of the machine you're going to be running on to hit you timelimits you might wa...
dd: How to calculate optimal blocksize? [closed]
...est way may be to experiment: copy a gigabyte with various block sizes and time that. (Remember to clear kernel buffer caches before each run: echo 3 > /proc/sys/vm/drop_caches).
However, as a rule of thumb, I've found that a large enough block size lets dd do a good job, and the differences bet...
What is pseudopolynomial time? How does it differ from polynomial time?
What is pseudopolynomial time ? How does it differ from polynomial time? Some algorithms that run in pseudopolynomial time have runtimes like O(nW) (for the 0/1 Knapsack Problem ) or O(√n) (for trial division ); why doesn't that count as polynomial time?
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What is the difference between RegExp’s exec() function and String’s match() function?
...llowed by captures)
Exec is what you use when you are capturing, and each time it is executed it gives the match, followed by the captures. (match will behave in a manner of giving the full match followed by captures, only when the regex is not global).
Another use with Exec, is getting the index...
When to use enumerateObjectsUsingBlock vs. for
...lower then fast enumeration with a loop. I ran this test several thousand times; the body of the block and loop were the same single line of code: [(NSOperation *)obj cancel];. The averages: fast enum loop - -[JHStatusBar dequeueStatusMessage:] [Line: 147] Fast enumeration time (for..in..loop): 0....
Efficient way to remove ALL whitespace from String?
...ore a Regex instance. This will save the overhead of constructing it every time, which is more expensive than you might think. private static readonly Regex sWhitespace = new Regex(@"\s+"); public static string ReplaceWhitespace(string input, string replacement) { return sWhitespace.Replace(input, r...
How many String objects will be created when using a plus sign?
... resulting IL.
Keep in mind that there may be further optimizations at runtime. I'm just going by what IL is produced.
Finally, as regards interning, constants and literals are interned, but the value which is interned is the resulting constant value in the IL, not the literal. This means that y...
When to Redis? When to MongoDB? [closed]
...g to query your data.
MongoDB is suited for Hackathons, startups or every time you don't know how you'll query the data you inserted. MongoDB does not make any assumptions on your underlying schema. While MongoDB is schemaless and non-relational, this does not mean that there is no schema at all. I...
Is there a simple way to remove multiple spaces in a string?
...used 11 paragraphs, 1000 words, 6665 bytes of Lorem Ipsum to get realistic time tests and used random-length extra spaces throughout:
original_string = ''.join(word + (' ' * random.randint(1, 10)) for word in lorem_ipsum.split(' '))
The one-liner will essentially do a strip of any leading/trailin...