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What makes Scala's operator overloading “good”, but C++'s “bad”?
...rators may be used infix that puts pressure on people to try to map a wide range of unrelated concepts onto a relatively few symbols like "+" and ">>"
Scala allows a huge range of valid non-word symbols as method names. For instance, I've got an embedded Prolog-ish DSL where you can write
...
What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...
"Evaluating an expression whose result is not in the range of the corresponding types" .... integer overflow is well-defined for UNSIGNED integral types, just not signed ones.
– nacitar sevaht
Aug 9 '13 at 20:06
...
How to write a switch statement in Ruby
...ot x === 1..5.
This allows for sophisticated when clauses as seen above. Ranges, classes and all sorts of things can be tested for rather than just equality.
Unlike switch statements in many other languages, Ruby’s case does not have fall-through, so there is no need to end each when with a bre...
What does the constant 0.0039215689 represent?
...ication by 0.0039215689f converts an integer valued color intensity in the range 0 to 255 to a real valued color intensity in the range 0 to 1.
As Ilmari Karonen points out, even if this is an optimisation it's a rather badly expressed one. It would be so much clearer to multiply by (1.0f/255).
...
How does the MapReduce sort algorithm work?
...tioner that uses a sorted list of N − 1 sampled keys that define the key range for each reduce. In particular, all keys such that sample[i − 1] <= key < sample[i] are sent to reduce i. This guarantees that the output of reduce i are all less than the output of reduce i+1."
So their trick...
What is the fastest substring search algorithm?
...aystack ? ?
This should really be a graph, with a range of shorter to longer inputs on each axis. If you plotted each algorithm on such a graph, each would have a different signature. Some algorithms suffer with a lot of repetition in the pattern, which might affect uses l...
Algorithm to return all combinations of k elements from n
..., with minor changes – I used the index of the sets rather than a number range to represent the set, so we are always working from 0...n.
Note:
Since combinations are unordered, {1,3,2} = {1,2,3} --we order them to be lexicographical.
This method has an implicit 0 to start the set for the first ...
Binary Data in JSON String. Something better than Base64
...te we start looking at.
As a consequence, if encoding a byte value in the range [0..127] would need only one byte in UTF-8 encoding, encoding a byte value in the range [128..255] would require 2 bytes !
Worse than that. In JSON, control chars, " and \ are not allowed to appear in a string. So the b...
Parallel foreach with asynchronous lambda
...xception(exceptions);
}
}
}
Usage example:
await Enumerable.Range(1, 10000).ParallelForEachAsync(async (i) =>
{
var data = await GetData(i);
}, maxDegreeOfParallelism: 100);
share
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O(nlogn) Algorithm - Find three evenly spaced ones within binary string
..., whose description we omit.
Wikipedia:
When the integers are in the range [−u ... u], 3SUM can be solved in time O(n + u lg u) by representing S as a bit vector and performing a convolution using FFT.
This is enough to solve your problem :).
What is very important is that O(n log n) is c...