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What is an NP-complete in computer science?
...s reducible to x
So, what makes NP-Complete so interesting is that if any one of the NP-Complete problems was to be solved quickly, then all NP problems can be solved quickly.
See also the post What's "P=NP?", and why is it such a famous question?
What is NP-Hard?
NP-Hard are problems that are at l...
Hash Code and Checksum - what's the difference?
...s are easy to compute, and can detect many types of data corruptions (e.g. one, two, three erroneous bits).
A hashcode simply describes a mathematical function that maps data to some value. When used as a means of indexing in data structures (e.g. a hash table), a low collision probability is desir...
Prevent automatic browser scroll on refresh
... that the first scroll event has to belong to the automatic repositioning done by the browser. When this occurs we do our own repositioning and then remove the bound event. This prevents subsequent page scrolls from borking the system.
$(document).ready(function() {
if (window.location.hash) { ...
Using tags to turn off caching in all browsers? [duplicate]
...of the http-equiv
declarations AND fail with the W3C validator. At most, one could have
one of each http-equiv declarations; pragma, cache-control and
expires. These are completely outdated when using modern up to date browsers.
After IE9 anyway. Chrome and Firefox specifically does not work...
Dealing with “Xerces hell” in Java/Maven?
... It is confusing, but it's due to the third party uploads of non-versioned Xerces jars, like justingarrik was saying in his post. xml-apis 2.9.1 is the same as 1.3.04, so in that sense, 1.4.01 is newer (and numerically larger) than 1.3.04.
– liltitus27
Nov...
How to add onload event to a div element
...
Throw this link out here for anyone that comes across this answer w3schools.com/tags/ev_onload.asp - All the HTML elements that currently support onload
– Brandon Benefield
Mar 13 '18 at 18:39
...
iOS 7 - Failing to instantiate default view controller
...
Create a new Storyboard in your project, name it something like Main_iPhoneV2 (or iPadV2 depending on your original storyboard style)
Open the broken storyboard, click anywhere in the white area and press command-a, then command-c (select all and copy)
Open your new storyboard and press command-v...
Write a function that returns the longest palindrome in a given string
...
When someone goes on Stack Overflow, the question "answer" should actually contain an answer. Not just a bunch of directions towards the answer..
– Erik Philips
Oct 22 '18 at 17:16
...
Remove sensitive files and their commits from Git history
...yet; if it is remote and not secured from others you have a problem. If anyone has cloned that repository before you fix this, they'll have a copy of your passwords on their local machine, and there's no way you can force them to update to your "fixed" version with it gone from history. The only saf...
Real world use cases of bitwise operators [closed]
...ed to numeric values, since the medium may only be capable of transmitting one bit at a time.
Compression, Encryption
Both of these are heavily dependent on bitwise algorithms. Look at the deflate algorithm for an example - everything is in bits, not bytes.
Finite State Machines
I'm speaking primar...