The other day my chemistry teacher was explaining to us about scientific notation (using a small number and multiplying it by powers of ten to express large numbers more easily), which brought me back a few years to when I first learnt it. After learning the basics, we had done a bunch of typical...

Wouldn't it be neat if programming functions could be inverted, just like the mathematical function they implement? Write a function (or program) that takes one input x in any form, that outputs ln(x). When the bytes of the program are reordered/reversed so that the first byte now is the last b...

The Compression Catalog code-golf compression kolmogorov-complexity Introduction It seems that a lot of programming languages use compression algorithms these days. To see who has the best compression algorithm at that moment, I've set up a challenge. Task The task is very simple. You need t...

This challenge is inspired by this other. The challenge Write a program or a function in any programming language that given as input a string representing a time in English (see below, for further details) it outputs or prints the equivalent in the 24 hours "digital" format HH:MM. Shortest co...

Introduction: You, the robbers, have taken over Google! However, the cops are passing messages back and forth in an attempt to destroy you. Challenge: Cops thread here(main rules) To crack a challenge, create a post that looks like this: Name of cops submission Language you think it...

Introduction: Robbers have taken over Google! However, they haven't taken over everything. You need to get secret messages to other cops, while fooling the robbers about their meaning. Challenge: Robbers thread here Create a snippet of code, that when run in the correct language, will outpu...

Given an undirected graph and a start node, there is an expected number of steps to reach all possible nodes if you walk at random. This expected number of steps will depend on which node you start from. For a given graph and starting node, let us call the number of steps to visit all nodes in th...

Reasoning code-golf Introduction Reasoning is one of the most important human capabilities, often counted as what separates us from other species. This capacity, however, takes up a substantial portion of our meaty brain. Your challenge is to recreate a reasoning system in a much abbreviated f...

I have a chocolate bar and I need help eating it so you'll be writing a program just to do that. Explanation 7 ____ __|__| |__|__| |__|__| |__|__| 6 _______ |__|__| |__|__| |__|__| 5 ____ __|__| |__|__| |__|__| 0 1 ____ |__| Spec A chocolate bar is always "two pieces" lon...

In trigonometry, there are certain angles known as "special angles". This is because when you take sin, cos or tan of one of these angles, you get a result that is easy to remember because it is a square root of a rational number. These special angles are always multiples of either pi/6, or pi/4....

Wring the changes I want to ring Stedman Doubles, but I'm lazy so I want to get to a particular change and back as quickly as possible. As with all change-ringing, the bells start in ascending order, known as Rounds, in this case 12345. The method is called Doubles because at each change two pa...

We have multiple questions with some aspects of calculus (<-- that's a question per word). We already have tags for number-theory, probability-theory, and various other sects of mathematics. I doubt that we won't have more calculus questions, so let's make a tag for the future.

You are to approximate the value of: Where your input is I. Rules You may not use any built-in integral functions. You may not use any built-in infinite summation functions. Your code must execute in a reasonable amount of time ( < 20 seconds on my machine) You may assume that input is grea...

Implement Arbitrary Precision Integers Help me out with comments! I don't think this is a dupe, but it is related to GOLF CPU - Implement Arbitrary Precision Integer Division. The notable difference is that it allows for any language and will be scored differently. This is code-golf. The tas...