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Can hash tables really be O(1)?
...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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Best practices/guidance for maintaining assembly version numbers
...g to come up with an easy to use versioning system. From what you have already said in your question it is clear that you have understood one important point, the assembly version numbers are not synonymous with the product version. One is technically driven, and the other is driven by the business....
PHP mail function doesn't complete sending of e-mail
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bool mail ( string $to , string $subject , string $message [, string $additional_headers [, string $additional_parameters ]] )
The mail function takes three required parameters and optionally a fourth and fifth one. If your call to mail() does not have at least three parameters it will fail. ...
How many GCC optimization levels are there?
...original version of this answer stated there were 7 options. GCC has since added -Og to bring the total to 8
From the man page:
-O (Same as -O1)
-O0 (do no optimization, the default if no optimization level is specified)
-O1 (optimize minimally)
-O2 (optimize more)
-O3 (optimize ...
Understanding recursion [closed]
...gant.
Let's talk about trees. In computer science, a tree is a structure made up of nodes, where each node has some number of children that are also nodes, or null. A binary tree is a tree made of nodes that have exactly two children, typically called "left" and "right"; again the children can be n...
Difference between CouchDB and Couchbase
... Couchbase Server that need to be pointed out.
I will not write about the advantages of switching from CouchDB to the Couchbase Server because those are described pretty much everywhere (see The Future of CouchDB by Damien Katz or
Couchbase vs. Apache CouchDB
by Couchbase). Instead, I will try to ...
What is a stack trace, and how can I use it to debug my application errors?
...n the application. Let's have a look at the stack trace:
Exception in thread "main" java.lang.NullPointerException
at com.example.myproject.Book.getTitle(Book.java:16)
at com.example.myproject.Author.getBookTitles(Author.java:25)
at com.example.myproject.Bootstrap.main(Boots...
How to implement a queue with three stacks?
...ing lazy evaluation). He did know of an algorithm using 6 stacks as we already know looking at the answers here. So I guess the question is still open to find an algorithm (or prove one cannot be found)."
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When is assembly faster than C?
...cision loss). i.e. uniform absolute precision over the entire range, instead of close-to-uniform relative precision (float).
Modern compilers optimize this fixed-point example nicely, so for more modern examples that still need compiler-specific code, see
Getting the high part of 64 bit intege...
How does the ARM architecture differ from x86? [closed]
...t ARM instructions operate only on registers with a few instructions for loading and saving data from / to memory while x86 can operate directly on memory as well. Up until v8 ARM was a native 32 bit architecture, favoring four byte operations over others.
So ARM is a simpler architecture, leading ...