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How can I compare two lists in python and return matches
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What would be the time complexity of the first example set(a) & set(b) ?
– AdjunctProfessorFalcon
May 19 '17 at 1:56
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node.js hash string?
...n doing? Is it registering the md5sum.update(d) function to execute every time there is data being read from the ReadStream?
– DucRP
Jul 14 '15 at 17:01
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How to check size of a file using Bash?
... Yes, but certainly economically superior: Cost of engineering time > Cost of computation time
– BananaNeil
Sep 7 '14 at 20:48
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Convert Unix timestamp into human readable date using MySQL
Is there a MySQL function which can be used to convert a Unix timestamp into a human readable date? I have one field where I save Unix times and now I want to add another field for human readable dates.
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Is there a printf converter to print in binary format?
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And has the advantage also to be invocable multiple times in a printf which the ones with static buffers can't.
– Patrick Schlüter
Oct 24 '10 at 10:28
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lexers vs parsers
...s currently explored by so-called scannerless GLR parsers. That has a runtime cost, as you are applying more general machinery to what is often a problem that doesn't need it, and usually you pay for that in overhead. Where you have lots of free cycles, that overhead may not matter. If you proc...
Can you build dynamic libraries for iOS and load them at runtime?
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At the time this question was asked, Dynamic libraries were not supported by iOS and will result in your app getting rejected. Only static libraries are allowed.
However, in iOS8 you can use dynamic libraries and frameworks. It sho...
What is Virtual DOM?
...tically huge. Finding and updating a node/nodes in case of an event is not time efficient.
VDOM solves this problem by creating a high label abstraction of actual dom. The VDOM is a high level lightweight in-memory tree representation of actual DOM.
For example, consider adding a node in DOM; re...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...F, 0xBF, 0x7F, 0xFF
};
unsigned int v; // reverse 32-bit value, 8 bits at time
unsigned int c; // c will get v reversed
// Option 1:
c = (BitReverseTable256[v & 0xff] << 24) |
(BitReverseTable256[(v >> 8) & 0xff] << 16) |
(BitReverseTable256[(v >> 16) &...
Apache Spark: The number of cores vs. the number of executors
...s 100% limited by concurrency (the number of threads). We would expect runtime to be perfectly inversely correlated with the number of threads.
ratio_num_threads = nthread_job1 / nthread_job3 = 15/24 = 0.625
inv_ratio_runtime = 1/(duration_job1 / duration_job3) = 1/(50/31) = 31/50 = 0.62
So rati...