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insert vs emplace vs operator[] in c++ map
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Looks like there is a performance bug of insert in unordered_map and map: link
– Deqing
Aug 10 '16 at 0:43
2
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Accessing class variables from a list comprehension in the class definition
...[i for i in range(1) for j in range(x)]
This design decision was made in order to throw an error at genexp creation time instead of iteration time when creating the outermost iterable of a generator expression throws an error, or when the outermost iterable turns out not to be iterable. Comprehens...
Maximum single-sell profit
... element and the new
# minimum value is. Note that it doesn't matter what order we do this in; if
# the (k + 1)st element is the smallest element so far, there's no possible way
# that we could increase our profit by selling at that point.
#
# To finish up this algorithm, we should note that given ...
Programmer Puzzle: Encoding a chess board state throughout a game
...ve), a draw can be claimed. The positions need not occur in any particular order (meaning it doesn’t have to the same sequence of moves repeated three times). This one greatly complicates the problem because you have to remember every previous board position. If this is a requirement of the proble...
How can I create a table with borders in Android?
...data as table, but I want a table with user-defined columns and rows with borders. Suggestions?
18 Answers
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fastest MD5 Implementation in JavaScript
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"In order to make my JavaScript MD5 code faster than everyone else's, I had to take advantage of local function variables." What a breakthrough!
– Glenn Maynard
Dec 16 '10 at 7:12
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What is your most productive shortcut with Vim?
...d of your file as a scratch space). This will have preserved the relative order of all the "foo" lines while having extracted them from the rest of the list. (This would be equivalent to doing something like: 1G!GGmap!Ggrep foo<ENTER>1G:1,'a g/foo'/d (copy the file to its own tail, filter th...
Which would be better for concurrent tasks on node.js? Fibers? Web-workers? or Threads?
... mean that it lacks things. For a synchronous job (where we can decide the order and way of processing), it works as well as multi-threaded parallelism. For a job that comes from outside like requests to a server, it simply is superior.
(1) Unless you are building libraries in other languages lik...
How should a model be structured in MVC? [closed]
...alidate data before sending an invoice, or to compute the total cost of an order. At the same time, Domain Objects are completely unaware of storage - neither from where (SQL database, REST API, text file, etc.) nor even if they get saved or retrieved.
Data Mappers
These objects are only responsibl...
What are metaclasses in Python?
...y)
Metaclasses are the 'stuff' that creates classes.
You define classes in order to create objects, right?
But we learned that Python classes are objects.
Well, metaclasses are what create these objects. They are the classes' classes,
you can picture them this way:
MyClass = MetaClass()
my_object = ...