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Can hash tables really be O(1)?
It seems to be common knowledge that hash tables can achieve O(1), but that has never made sense to me. Can someone please explain it? Here are two situations that come to mind:
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Reference assignment operator in PHP, =&
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Why invoke Thread.currentThread.interrupt() in a catch InterruptException block?
Why invoke the method Thread.currentThread.interrupt() in the catch block?
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Why is volatile not considered useful in multithreaded C or C++ programming?
...ntly posted, I seem to be confused about the utility (or lack thereof) of volatile in multi-threaded programming contexts.
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Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
I have a computer with 1 MB of RAM and no other local storage. I must use it to accept 1 million 8-digit decimal numbers over a TCP connection, sort them, and then send the sorted list out over another TCP connection.
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Jackson JSON custom serialization for certain fields
Is there a way using Jackson JSON Processor to do custom field level serialization? For example, I'd like to have the class
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How do I use itertools.groupby()?
I haven't been able to find an understandable explanation of how to actually use Python's itertools.groupby() function. What I'm trying to do is this:
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What exactly does big Ө notation represent?
I'm really confused about the differences between big O, big Omega, and big Theta notation.
6 Answers
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What is the difference between Θ(n) and O(n)?
Sometimes I see Θ(n) with the strange Θ symbol with something in the middle of it, and sometimes just O(n). Is it just laziness of typing because nobody knows how to type this symbol, or does it mean something different?
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How to make a SIMPLE C++ Makefile
We are required to use a Makefile to pull everything together for our project, but our professor never showed us how to.
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