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How to implement a queue with three stacks?
...question
DETAILS
There are two implementations behind this link: http://www.eecs.usma.edu/webs/people/okasaki/jfp95/index.html
One of them is O(1) with three stacks BUT it uses lazy execution, which in practice creates extra intermediate data structures (closures).
Another of them is O(1) but u...
Measuring the distance between two coordinates in PHP
...ized function from codexworld.com:
/**
* Optimized algorithm from http://www.codexworld.com
*
* @param float $latitudeFrom
* @param float $longitudeFrom
* @param float $latitudeTo
* @param float $longitudeTo
*
* @return float [km]
*/
function codexworldGetDistanceOpt($latitudeFrom, $longit...
A gentle tutorial to Emacs/Swank/Paredit for Clojure
...
There is one more excelent tutorial:
http://www.braveclojure.com/basic-emacs/ (1st part)
http://www.braveclojure.com/using-emacs-with-clojure/ (2nd part)
In 30 to 45 minutes one can have everything setup from scratch.
The tutorial does not assumes any prior knowladg...
How many system resources will be held for keeping 1,000,000 websocket open? [closed]
...mum number of open TCP connections that a modern Linux box can have
http://www.kegel.com/c10k.html
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What's the difference between an exclusive lock and a shared lock?
.... However, other processes can request read locks.
More on that : http://www.gnu.org/software/libc/manual/html_node/File-Locks.html
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How to detect internet speed in JavaScript?
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//JUST AN EXAMPLE, PLEASE USE YOUR OWN PICTURE!
var imageAddr = "http://www.kenrockwell.com/contax/images/g2/examples/31120037-5mb.jpg";
var downloadSize = 4995374; //bytes
function ShowProgressMessage(msg) {
if (console) {
if (typeof msg == "string") {
console.log...
How to simulate a higher resolution screen? [closed]
...
This solution is way faster than the ones proposed above:
http://www.infobyip.com/testwebsiteresolution.php
It's not as versatile as browsershots.org but it's much faster (a few seconds v. a 45 minute queue).
shar...
Advantages of using display:inline-block vs float:left in CSS
... floats work.
Don’t be fooled. You’re being brainwashed.
http://www.sitepoint.com/give-floats-the-flick-in-css-layouts/
2015 Update - Flexbox is a good alternative for modern browsers:
.container {
display: flex; /* or inline-flex */
}
.item {
flex: none | [ <'flex-grow'> <...
How can one see the structure of a table in SQLite? [duplicate]
... many other useful builtin dot commands -- see the documentation at http://www.sqlite.org/sqlite.html, section Special commands to sqlite3.
Example:
sqlite> entropy:~/Library/Mail>sqlite3 Envelope\ Index
SQLite version 3.6.12
Enter ".help" for instructions
Enter SQL statements terminated wit...
What is a “surrogate pair” in Java?
...ttps://coolsymbol.com/emojis/emoji-for-copy-and-paste.html#objects
https://www.online-toolz.com/tools/text-unicode-entities-convertor.php
https://www.ibm.com/developerworks/library/j-unicode/index.html
https://www.oracle.com/technetwork/articles/javaee/supplementary-142654.html
More info on example...