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Why do we check up to the square root of a prime number to determine if it is prime?
To test whether a number is prime or not, why do we have to test whether it is divisible only up to the square root of that number?
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Please explain the exec() function and its family
...execution model" is that there are two operations you can do.
The first is to fork(), which creates a brand new process containing a duplicate (mostly) of the current program, including its state. There are a few differences between the two processes which allow them to figure out which is the paren...
How to parse a date? [duplicate]
I am trying to parse this date with SimpleDateFormat and it is not working:
5 Answers
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How to encrypt/decrypt data in php?
I'm currently a student and I'm studying PHP, I'm trying to make a simple encrypt/decrypt of data in PHP. I made some online research and some of them were quite confusing(at least for me).
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How to split text without spaces into list of words?
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A naive algorithm won't give good results when applied to real-world data. Here is a 20-line algorithm that exploits relative word frequency to give accurate results for real-word text.
(If you want an answer to your original question which does not use word frequency, you need ...
PyPy — How can it possibly beat CPython?
...gement (which is what CPython does with its counting) can be slower than automatic management in some cases.
Limitations in the implementation of the CPython interpreter preclude certain optimisations that PyPy can do (eg. fine grained locks).
As Marcelo mentioned, the JIT. Being able to on the f...
Simple way to transpose columns and rows in SQL?
...w do I simply switch columns with rows in SQL?
Is there any simple command to transpose?
9 Answers
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Heap vs Binary Search Tree (BST)
...verywhere in this answer, BST == Balanced BST, since unbalanced sucks asymptotically
**: using a trivial modification explained in this answer
***: log(n) for pointer tree heap, n for dynamic array heap
Advantages of binary heap over a BST
average time insertion into a binary heap is O(1), for B...
Generate Java classes from .XSD files…?
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JAXB does EXACTLY what you want. It's built into the JRE/JDK starting at 1.6
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Why is creating a new process more expensive on Windows than Linux?
...plain the technical reasons for why it's more expensive and provide any historical reasons for the design decisions behind those reasons?
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