Output a consistent value if the computer/device the code runs on an IPv4 address, or a different consistent value if it has an IPv6 address. You may assume that the device will have exactly one public address that is either IPv4 or IPv6.

Proper Kerning Given an image and a TrueType font file, determine if the text in the image is kerned appropriately. Input A 100x100 pixel white image with black text A TrueType font file for the font of the text in the image Output A truthy value if the text in the image is kerned appropri...

Because we haven't had enough of these, let's do another weird language! + increments the accumulator - decrements the accumulator # outputs the character with the codepoint of the accumulator modulo 127, and then resets the accumulator $ is like # but it doesn't reset the accumulator % reads a...

A Directed Acyclic Graph (DAG) is a type of graph that has no cycles in it. In other words, if there is a link from node A to node B, there exists no path from B to A (via any nodes). Challenge Determine whether the directed graph given as input is acyclic. Input A list of lists of integers r...

Rotate-Replace a String code-golfstring Replace Alias to Form Phrases is related. Task Write a program or function that, given a string and a list of strings, replaces each occurrence of an element of the string list contained in the string with the next element of the string list. Example...

Suppose you have two six-sided dice. Roll the pair 100 times, calculating the sum of each pair. Print out the number of times each pair occurred. (output can by ugly) Example Output: [3, 3, 9, 11, 15, 15, 11, 15, 7, 8, 3] ( The number of times a sum was rolled is represented in the sums index - 2)

Introduction Sometimes I get bored and there are no new questions on PPCG, so I want you to dig a random question from PPCG's past. Challenge Given a user's PPCG ID as input, output the URL of a randomly chosen PPCG question. If the question does not meet the following criteria, you must choos...

Introduction Alice is a 2-d language by Martin Ender which has two different execution modes, cardinal and ordinal. When the instruction pointer passes through a mirror (either / or \), it switches from one mode to the other one. In this challenge we will focus on ordinal mode, where commands o...

Thanks to the Petri Dilemma I found myself able to handle this King of the Hill. The game The game is a simple "Rock-Paper-Scissor" with a twist: Points gained with each victory increase during the match (your R, P or S get loaded). Paper wins Rock Scissor wins Paper Rock wins Scissor The w...

Mark Duplicates Given a list of non-negative integers, find the values which are duplicates and mark their positions. For example, given [1, 2, 3, 2, 1], the output could be [1, 1, 0, 1, 1] where each 1 signifies that the value at that position is duplicated elsewhere in the array and each 0 si...

I wish to input a file name and output its extension. For example : if input = foo.py then output = py I have written code and also know other ways of doing it. But can't understand where I went wrong in the following code : string='' # the final output string def extn(j) : # function to conc...

A common year is a year that is not a leap year and where the first and last day of the year are on the same day. A special common year is one that starts on a Monday and so ends on a Monday as well. Your challenge is to create a program/function that when given a year as input finds the neares...

Application screen shot Write the minimal code you need to take a screenshot of your application window. I am not asking for a function or program; just only a code segment. It has obviously to be a GUI application; console applications not allowed. Input: Some code in the programming languag...