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Java HashMap performance optimization / alternative
...create a large HashMap but the put() performance is not good enough. Any ideas?
25 Answers
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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...rseTable256[p[2]];
q[0] = BitReverseTable256[p[3]];
You can extend this idea to 64-bit ints, or trade off memory for speed (assuming your L1 Data Cache is large enough), and reverse 16 bits at a time with a 64K-entry lookup table.
Others
Simple
unsigned int v; // input bits to be reverse...
Why switch is faster than if
...d like to bring up is the famous Divide and Conquer. So my above 255 array idea could be reduced to no more then 8 if statements as a worst case scenario.
I.e. but keep in mind it get's messy and hard to manage fast and my other approach is generally better, but this is utilize in cases where array...
Which is faster: Stack allocation or Heap allocation
...loop at the very beginning of your main function, something to give you an idea how much time per loop-cycle you're getting, and adjust the other loops so as to ensure your example runs for some amount of time, instead of the fixed constant you're using.
– Joe Pineda
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Good or bad practice? Initializing objects in getter
...".
Short answer:
Using lazy initialization unconditionally is not a good idea. It has its places but one has to take into consideration the impacts this solution has.
Background and explanation:
Concrete implementation:
Let's first look at your concrete sample and why I consider its implementati...
How should I have explained the difference between an Interface and an Abstract class?
...document among various teams in software development.
Interfaces give the idea what is to be done but not how it will be done. So implementation completely depends on developer by following the given rules (means given signature of methods).
Abstract classes may contain abstract declarations, conc...
How to define object in array in Mongoose schema correctly with 2d geo index
...erver always returns the "trk" field values as [Object]. Somehow I have no idea how this should work, as I tried at least all approaches which made sense to me ;-)
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What are MVP and MVC and what is the difference?
... Well Todd's diagramatic illustration of MVC completely contradicts the idea of decoupling the View and Model. If you look at the diagram, it says Model updates View (arrow from Model to View). In which universe is a system, where the Model directly interacts with the View, a decoupled one???
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Algorithm for classifying words for hangman difficulty levels as “Easy”,“Medium”, or “Hard”
...ould take if guessing that word.
2. Aside on hangman strategy
There's an idea that's implicit in some the other answers and comments, that the optimal strategy for the solver would be to base their decisions on the frequency of letters in English, or on the frequency of words in some corpus. This ...
Tying in to Django Admin's Model History
...irly tightly coupled to the admin, so you may be best just using these for ideas and creating your own version for your app.
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