Tell me when the next post is... WebSockets! code-golf websockets Background I was working on a StackOverflow helper program (that sends me notifications) when I noticed something rather interesting in StackOverflow's Network tab. StackOverflow uses WebSockets (not too surprising, but good ...

There are five websites. Each containing a string of 3 (sometimes 2) letters. It is your job to write a code which can retrive the characters from each website and concatenate them to form a password. However, its not that easy, every 10 seconds the code will change on all five sites and you wil...

Binary Sequences Given a binary number A as input with d > 1 digits, output a binary number B with d digits according to the following rules for finding the nth digit of B: If 1 < n < d, then if the (n-1)th, nth and (n+1)th digits of A are equal, then the nth digit of B is zero; otherwise, it i...

Given an Integer array: Start from the first number (n) Go forward (n) positions depending on the current position Delete the current position, the rest of the array fill in to the current position. Goto step 2 until there are one number remaining Print that number The array loops around (the...

Tell my browser Background Many people visit webpages, which require special browsers because of lack of compatibility. So you have to write a script (client sided or server sided), which just prints the name of the browser. Because not everyone has fast internet, the script has to be as short ...

Write an indefinitely-running program that reports how many instances of itself are currently running. Each instance of the program should also report the order in which it was opened out of all other currently-running instances. Example The user launches the program for the first time - we'll ...

Golf a number Create a program or function, which when given an input integer, outputs a mathematical expression evaluating to the same value, but which requires fewer bytes to represent than the integer itself. Explanation It is often useful when golfing to compress constant integer expressio...

Can This Number be Decoded Infinitely? code-golfprimes This challenge posed an algorithm for encoding an integer n as another integer r, with the following process: First we encode the number as an array of arrays. If n is 1, return an empty string. Otherwise, Create an array of all of n's...

A follow-up to this challenge Given a set of mixed dice, output the frequency distribution of rolling all of them and summing the rolled numbers on each die. For example, consider 1d12 + 1d8 (rolling 1 12-sided die and 1 8-sided die). The maximum and minimum rolls are 20 and 2, respectively, wh...

Parse the Parcel Thanks to your help in the Mark My Mail challenge, PPCG-Post has successfully stamped all of its parcels with the generated barcodes! Now, it's time to decode them. In this challenge your program will, given a barcode generated from the Mark My Mail challenge, decode it and re...

Hack Stack! Your challenge is to create a code snippet in javascript that will upvote your answer when run. This should not be possible, but maybe it is. We'll see! Rules Standard Loopholes are not allowed. You should not auto-downvote other answers. Do not manually upvote any ansewer, pleas...

I have 3 lists: list_1 = [9, 5, 1, 2, 4, 8, 10, 6, 7, 3] list_2 = [9, 5, 1, 4, 2, 6, 8, 10, 3, 7] list_3 = [9, 5, 1, 4, 8, 10, 3, 6, 7, 2] I want to get average of these 3 lists. Not mathematical average, but average according to their position. For example, the answer in this case would be:...

Background I was working on a StackOverflow helper program (that sends me notifications) when I noticed something rather interesting in StackOverflow's Network tab: StackOverflow uses WebSockets (not too surprising, but good to know)! For this challenge, we will be conquering StackOverflow's...