A magic square is a square in which: 1.There is one in the left upper cell. 2. There are no repeating numbers in any column. 3. There are no repeating numbers in any row. 4. There are no repeating numbers in any of the smaller squares. 5.If we swap two smaller squares having a common side...

You encounter random radio transmissions spread across a number of channels. Each broadcast reads a string of integers... generally between 1 and about 12 of them total, average, but with no actual applied limit. After a while, you start to realize a pattern. The sets of numbers read on each cha...

Recently, I have found my reputation changing time to time. I would like to know my reputation changing real-time. The job Given an id of a user on PPCG (ex.64499), Print the user's reputation every 10 seconds. Examples 64499 3808 40695

You are Ruby, a railway engineer. Your task is to lay track in any given valley such that it visits every station (M). The amount of track laid is not important, but it must be laid in one continuous path which starts and ends at the valley entrance/exit point (>) and does not, at any point cross...

Given an audio file, determine whether it is encoded in a lossy format or a lossless format. For the purposes of this challenge, only the following formats need to be classified: Lossy AC3 AMR AAC MP2 MP3 Ogg Vorbis WMA Lossless AIFF FLAC TTA WAV Rules If input is taken in the form of...

Challenge Given three numbers a, b, and n, you must expand (a + bx)^n in ascending powers of x up to x^3. Binomial Expansion The binomial expansion works like so: (a + bx)^n = a^n(1 + bx/a)^n = a^n(1 + n(bx/a) + n(n -1)(bx/a)^2/2! + n(n-1)(n-1)(bx/a)^3/3!) Or, more readable: W...

Many different types of train set exist, ranging from wooden tracks like Brio, to fully digital control perfect tiny metal replicas of real trains, but they all require a track to be designed, ideally using as many of your pieces as possible. So, your task is to determine whether, given input of...

Your task: given an integer n, output an embedded triangle to the nth depth. Standard methods of input and output, input in any convenient format, output should be as a string. Examples are 0-indexed, you can use 1-indexed if you want. Standard loopholes apply The left and right sides of each f...

Perfect License Plates Starting a few years ago, I made myself a little game while driving around: checking if nearby license plates are "perfect". It's relatively rare, but exciting when you find one. To check if a license plate is perfect: Sum up the characters, with A = 1, B = 2, ... Z =...

Input A string containing a path to a folder Task To write a function or program to list file details like name, full path, size in kb, file extension in a tabular format of every file in that folder and any number of subsequent sub folders. If the folder path is invalid it should return nothi...

Gödel's β function takes three natural numbers as arguments. It is defined as β(x,y,z) = rem(x, 1 + (z + 1) · y) = rem(x, (z · y + y + 1) ) where rem(a, b) denotes the remainder after integer division of a by b. The β Lemma now states that: For any sequence of natural numbers (k_0, k...

I often see comments on questions which just say Related and link to another question. What's the point? When should I add links like this?

Problem adapted from the book Fortran 77 by Donald M. Monro Introduction Digital plotting machines are widely used to produce various forms of drawings, graphs and other pictorial results. Most such machines can move their pens only in certain directions, usually as single steps in the X and Y ...

Titin is a protein found in muscle tissue. It is a giant protein, greater than 1 µm in size, and its full chemical name is giant as well. Comprising of 189819 characters, the full name of titin would take about 3.5 hours to pronounce. Your task is to output this entire name! Details The full na...