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I presume you've all heard of the [Rosetta Stone](//en.wikipedia.org/wiki/Rosetta_Stone), an ancient stone found to have essentially the same passage written on it in three different scripts. This challenge is based upon that: you have to write three versions of the same program in ***different*** la... |
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Create an algorithm that uses [Cramer's Rule](http://www.purplemath.com/modules/cramers.htm) (with determinants of matrices) to solve for the solutions of a system of linear equations. The code should work for an "n" number of variables.
**You may use whatever data structure you want to hold the mat... |
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## The Scenario
You are a taxi driver in your city. You picked up a passenger from the airport and he told you the place he'd like to go.
To earn more money, you need to drive as much as you can. However, there are two problems:
* He always looks around. Therefore, you cannot pass from the same distr... |
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You are to create a program, that, given another program, and a position, will make it a quine. Namely, it needs to insert an expression at that point that evaluates to a string that is the programs input. For example:
```
main=do
putStrLn "Welcome to the open source program, would you like my so... |
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---
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Closed 1 year ago.
[Improve this ques... |
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A Web Crawler is a program that starts with a small list of websites and gets the source code for all of them. It then finds all the links in those source codes, gets the website it links to then puts them in a list. It then starts again but with the new list of websites.The main reason for a Web Cra... |
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# King of the Cards
*Code available [here](https://gist.github.com/GingerIndustries/7c2ea84cb7cb38307382892b1529a777)!*
In this King of the Hill challenge, you must write a bot that can play [Crazy Eights](https://en.wikipedia.org/wiki/Crazy_Eights). This is a card game often played by children, in w... |
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I've been doing quite a few code golf recently and I realised that a lot of times, I have to do something involving list.
Most of the times lists are space-separated or comma-separated values in the first argument (`argv[2]`), and the return value should also be a space/comma-separated string.
Are th... |
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Closed 2 years ag... |
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# Goal
Given a deal result from [Duplicate Contract Bridge](https://en.wikipedia.org/wiki/Contract_bridge), calculate the deal [score](https://en.wikipedia.org/wiki/Bridge_scoring#Scoring_elements).
Basically the same as [iBug](https://codegolf.stackexchange.com/users/71806/ibug)'s question, which wa... |
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**This question already has answers here**:
[Balanced Ternary Converter](/questions/41752/balanced-ternary-converter)
(20 answers)
Closed 5 years ago.
A Math.SE user have a funny game explained as such:
>
> 1. Pick a random positive integer X.
> 2. Add +1, 0, -1 to make it divisible by 3Keep ... |
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**This question already has answers here**:
[Sum of all integers from 1 to n](/questions/133109/sum-of-all-integers-from-1-to-n)
(222 answers)
Closed 6 years ago.
The 52 week challenge is a way to save money. For example, Week 1, you save $1.00. Week 2 you save $2.00, and it continues through ... |
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[<< Prev](https://codegolf.stackexchange.com/questions/150028/advent-challenge-6-transport-dock-relabeling) [Next >>](https://codegolf.stackexchange.com/questions/150355/advent-challenge-8-storage-cart-transport-planning)
After some careful analysis, Santa was able to determine the dock size ranges a... |
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**This question already has answers here**:
[Give me the Gray Code list of bit width n](/questions/32871/give-me-the-gray-code-list-of-bit-width-n)
(16 answers)
Closed 7 years ago.
[Gray Code](https://en.wikipedia.org/wiki/Gray_code) is a number system where only 1 bit of the number changes fr... |
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**This question already has answers here**:
[Binary to decimal converter](/questions/102219/binary-to-decimal-converter)
(84 answers)
Closed 7 years ago.
# The problem
Given a binary number from 0 to 111111 convert it to trinary. (Base 3). Then print the result.
## Rules
No using a list of con... |
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Based on [my SO question](https://stackoverflow.com/q/37302530/321973), but more specifically:
Find a RegEx such that, given a text where paragraphs end with an empty line (or `$` at the very end), match the up to twenty last characters of a paragraph excluding the `\r` or `$` but no more than three ... |
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**This question already has answers here**:
[Minimum perimeter of an area [duplicate]](/questions/18349/minimum-perimeter-of-an-area)
(11 answers)
Closed 8 years ago.
### Introduction
The task is simple. When given a number, output the most logical rectangle. To explain what a logical rectangl... |
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These days, I watched on TV a Gay Pride parade; at the time, I was thinking about quines and how they're a bit queer, outputting themselves (out of the closet?) and, well, why not combine both things into a Quine Pride Parade?
The challenge is to write a program that:
1. Is a quine.
2. Prints the sen... |
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
---
Closed 9 years ago.
* **General programming questions** are off-topic here, but can be asked on [Stack Overflow](http://stackoverflow.com/about).
* Questions without an **objective prima... |
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**This question already has answers here**:
[Ascending matrix](/questions/8543/ascending-matrix)
(10 answers)
Closed 9 years ago.
There is a table (the matrix one, not the one in your kitchen) called the "mex table". It has a left-top cell, at coordinates (0,0), but extends to infinity rightwa... |
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The Holy Grail Layout in CSS, is a full height, 3 column layout which consists of a fluid central column, and two side columns with fixed widths.
## Your Task is Simple!
Reverse it, make a fixed width central column, and two fluid width columns to the sides. The point is for them to take **All availa... |
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the question is "complete this subtraction by replacing the asterisks with digits so the numbers 1-9 only appear once each"
```
9**
-*4*
____
**1
```
my code tries random numbers until it works, and displays the answer. here is the entire html app. I want one to fit in a tweet at 140 characters (no... |
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**This question already has answers here**:
[Tips for golfing in Visual Basic .NET](/questions/155840/tips-for-golfing-in-visual-basic-net)
(3 answers)
Closed 2 years ago.
Any general tips for golfing in VB.net?
This, similar to Pascal, is a very rarely used language, thus having very few reso... |
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The player has to keep guessing a number from 1 to 10 until they guess the correct number to win the game. If they make an incorrect guess, they're told if their guess was too low or too high.
Each line has to render below the previous line for me to accept the solution as the new code for the game (... |
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>
> Have you been shooting gallery? We are recently.
>
>
>
In our shooting gallery cans and aluminum cans from under various drinks hang and stand. More precisely, they hung and stood.
From our shots, banks dangled from side to side on a rope, were torn off, rang, crumpled. This is not for you to... |
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**This question already has answers here**:
[Print the previous answer in reverse - with a catch (pt. 2)](/questions/187674/print-the-previous-answer-in-reverse-with-a-catch-pt-2)
(7 answers)
Closed 4 years ago.
Your challenge is very simple: output the previous answer, in reverse.
However, as... |
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# Challenge:
Given two inputs, **x** and **y**, round **x** to one less significant figure, then repeat until it has **y** number of unrounded digits left. (the decimal point does not count as a digit)
# Input & Output
Input can be a combination of strings and integers, e.g. you can have the input a... |
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**This question already has answers here**:
[Determine whether strings are anagrams](/questions/1294/determine-whether-strings-are-anagrams)
(162 answers)
[Manage Trash So](/questions/74164/manage-trash-so)
(36 answers)
Closed 6 years ago.
# Skat
I'm a fan of anagrams, so given two strings ... |
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## Task
The task is to write a script that accepts a number from 1 to 20 inclusive. It will then check if the number has a character that is found in every number that was entered before it. If the number has a character in common it will ask for another number. However if the number does not have a ... |
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When I saw this title in the Hot Network Questions I thought it was going to be a PPCG challenge. I was a little disappointed when it was on [Mathematica](https://mathematica.stackexchange.com/questions/147829/rot13-and-upside-down-text-flip-text).
So now it is on PPCG:
## Challenge
Given an input st... |
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In [Rocket League](https://www.rocketleague.com/), there are controls assigned to quick chat. For PC, they are
`1`, `2`, `3`, and `4`. To use a quick chat, you must press two controls. For example, the first option would be `1`, `1`.
You will be simulating the Rocket League client. You will be given ... |
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**This question already has answers here**:
[Fluctuating ranges](/questions/74855/fluctuating-ranges)
(20 answers)
Closed 7 years ago.
This is a fairly simple challenge. Given a lower-case word, you must "interpolate" between letters. Here's some examples to hopefully clarify this:
Input: `tes... |
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The goal is to output the number of the months given as input in a compact concatenated form which is still parsable if one knows the construction rules:
If either:
* January is followed by January, February, November or December; or
* November is followed by January or February
There must be a separ... |
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I am in desperate need of some ear defenders, so I can program in peace. Unfortunately, I don't have ear defenders. But I do have a pair of headphones, a microphone and a microcontroller, so I thought I'd make some noise-cancelling headphones.
However, there is one tiny problem. I can't program in no... |
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This challenge is inspired by [this other](https://codegolf.stackexchange.com/questions/71203/convert-the-time-to-a-string).
# 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 output... |
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The purpose of this challenge is to find the general term of a given arithmetic or geometric sequence.
### Explanation
The formula for an arithmetic sequence is as follows
an = a1 + (n-1)d
where a1 is the first term of the sequence, n is the index of the term, and d is the common difference between ... |
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You have a matrix of size *m* x *n*.
Each cell in the matrix has a uniformly random integer value *v*, where 0 ≤ *v* < *i*, and *i* ≤ (*m* x *n*). (Meaning, the matrix contains a maximum of *m* x *n* distinct values, but it may have fewer.)
1) Write a function that accepts input values of *m*, *n*, *... |
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The problem appeared on the [2013 SJCNY High School Programming Contest](http://faculty.sjcny.edu/~ProgrammingCompetition/Problems_2013.pdf). It was the last question in the set of problems and no team produced a correct answer during the 2.5 hours they had to work on it. Shortest solution that can h... |
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Imagine an ordered file set : `file1`, `file2`, ... `fileN`.
Each file is a textual file that is made of lines that have the same format : A concatenation of a fixed-size key (the same among all the file set) and a variable length value.
The merging algorithm is very similar to `UPSERT` :
* To merge ... |
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**This question already has answers here**:
[Incrementing Numbers, Over Multiple Sessions](/questions/11056/incrementing-numbers-over-multiple-sessions)
(23 answers)
Closed 10 years ago.
Write a program that after running will show how many times it was ran before. You are only allowed to modi... |
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Write a program which takes the current time of the system clock, rounds to the nearest minute (you may choose how to round halves) and displays it formatted as the following:
```
A quarter past one in the morning.
A quarter to two in the afternoon.
Two o'clock in the afternoon.
Twenty-five minutes t... |
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[
**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
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Closed 11 years ago.
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Given an \$n\times m\$ matrix \$A\$ and two integers \$w,h\$, output a matrix of \$w\times h\$ called \$B\$, such that $$B\_{i,j} = \int\_{i-1}^i\mathbb dx\int\_{j-1}^j A\_{\left\lceil \frac xw\cdot n\right\rceil,\left\lceil \frac yh\cdot m\right\rceil}\mathbb dy\text{ (1-index),}$$ $$B\_{i,j} = \int... |
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# Introduction
This problem is a challenge that has to do with DOM manipulation at scale and overcoming some issues that may be inherent in dealing with the DOM.
* This challenge is interesting because limitations push us to think through things differently and lean on the strengths of languages diff... |
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## This page is not for [Visual Basic .NET Tips](https://codegolf.stackexchange.com/q/155840/61846 "Visual Basic .Net Tips") or [VBA tips](https://codegolf.stackexchange.com/q/5175/61846 "Visual Basic for Applications Tips")
Visual Basic (VB or VB6) is an object-oriented and event-driven dialect of [... |
[Question]
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**This question already has answers here**:
[Sierpinski Carpets](/questions/40104/sierpinski-carpets)
(30 answers)
Closed 6 years ago.
A menger sponge is a fractal made out of cubes within cubes within cubes...
If you start with a cube, on each face there are 9 squares. The middle square becom... |
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**This question already has answers here**:
[Distance to four](/questions/92882/distance-to-four)
(6 answers)
Closed 6 years ago.
## Background
The Collatz Conjecture is quite well-known. Take any natural number. Triple and increment if odd; cut in half if even. Repeat, and it will reach 1 eve... |
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**This question already has answers here**:
[Golfing Relay Race](/questions/12071/golfing-relay-race)
(2 answers)
Closed 6 years ago.
# Task
You must write a program in Language A that will output the source code for a program in Language B which will then output the source code for a program ... |
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In a project I am working on, I am checking to see if certain DNA sequences appear in certain genes in E. coli. I have written a program in Java that performs the below features. However, since I wrote my program in [Java](http://meta.codegolf.stackexchange.com/a/5829/43444), the universe needs to be... |
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**Closed**. This question needs [details or clarity](/help/closed-questions). It is not currently accepting answers.
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**This question already has answers here**:
[Convert number to a base where its representation has most "4"s](/questions/10608/convert-number-to-a-base-where-its-representation-has-most-4s)
(20 answers)
Closed 8 years ago.
# Challenge
Inspired by [this](http://www.smbc-comics.com/index.php?db=... |
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## Objective
Write a program in any language that reads a matrix from `stdin` in which all columns are space delimited and all rows are newline delimited. The program must output a sub matrix so as that there is no other sub matrix with greater average, this sub matrix' average value, as well as the ... |
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Given an input, calculate the correct suffix and output the number in a readable format in short scale (where 1 billion is 10^9). The suffixes must go to at least 10^3000, in which the rules for calculating them can be found [here](http://www.isthe.com/chongo/tech/math/number/howhigh.html), or a list... |
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(Note: I know that the VSEPR method fails sometimes, and that there are exceptional molecules. The challenge is about the molecules which conform.)
Most people who have taken an introductory chemistry course know about molecules, and (probably) the [VSEPR theory](https://en.wikipedia.org/wiki/VSEPR_... |
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**This question already has answers here**:
[Program to Spoonerise words [duplicate]](/questions/3463/program-to-spoonerise-words)
(7 answers)
Closed 8 years ago.
Here is another short string related code-golf. You must write a full program that reads a string (from STDIN or as command line ar... |
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**This question already has answers here**:
[Regex in reverse - decompose regular expressions](/questions/25378/regex-in-reverse-decompose-regular-expressions)
(3 answers)
Closed 9 years ago.
Your task, if you accept it, is to make a string generator that generates strings based on a wildcard.... |
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Gi... |
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The goal of this challenge is to compare how well different programming languages support functional programming, by seeing how much code it takes to implement BLC8, the simplest functional programming language
BLC8 is the bytewise variant of Binary Lambda Calculus, as described in my 2012 IOCCC entr... |
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Given a string of ASCII text as input, encode it in [BPSK31](https://en.wikipedia.org/wiki/PSK31) using [Varicode](https://en.wikipedia.org/wiki/Varicode). You may either output an audio file in any common format, or play the audio over the device speakers. You may output at any sample rate and with ... |
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Anyone got tips for golfing in [Thue](https://esolangs.org/wiki/Thue). One tip per answer, and no tips aplicable to all languages (like remove comments)
]
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I have made a short script that will pull dns txt records down from a server and combine them into a single string.
DNS txt records are:
`1.website.com`
`2.website.com`
`3.website.com`
Each of these are iterated through using the single digit number.
The double quotes at the beginning and the end o... |
[Question]
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**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
---
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Closed 6 months a... |
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It is well known, in the field of Mathematics studying infinity, that [the Cartesian product of any finite amount of countable sets is also countable](https://proofwiki.org/wiki/Cartesian_Product_of_Countable_Sets_is_Countable/Corollary).
Your task is to write two programs to implement this, one to m... |
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[Fennel](https://fennel-lang.org/) is a lispy language which compiles to Lua.
From its page:
>
> Fennel is a programming language that brings together the speed, simplicity, and reach of Lua with the flexibility of a lisp syntax and macro system.
>
>
>
I am looking for general tips for golfing in... |
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# Introduction
There have been a few examples of the smallest possible OCI container that does "X". However these examples never correctly handle termination signals.
# Challenge
Produce the smallest possible container that correctly handles PID 1 signal responsibilities.
The container does not need ... |
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Given the equation of a non-parabolic conic section, output its characteristics.
---
# Spec
Some info on conic sections:
*for more info visit [Wikipedia](https://en.wikipedia.org/wiki/Conic_section)*
From an equation of the form \$ax^2+bx+cy^2+dy+E=0\$, it is possible to derive the type of conic sect... |
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The ***[Catalan numbers](https://en.wikipedia.org/wiki/Catalan_number)*** ([OEIS](https://oeis.org/A000108)) are a sequence of natural numbers often appearing in combinatorics.
The nth Catalan number is the number of Dyck words (balanced strings of parenthesis or brackets such as `[[][]]`; formally d... |
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**Challenge**
I've checked that there is a question [Compute the Discrete Cosine Transform](https://codegolf.stackexchange.com/q/120325/100303) which is a competition for implementing a shortest solution to compute the one dimensional discrete cosine transform.
The goal of this challenge is to implem... |
[Question]
[
**Closed.** This question is [off-topic](/help/closed-questions). It is not currently accepting answers.
---
Questions without an **objective primary winning criterion** are off-topic, as they make it impossible to indisputably decide which entry should win.
Closed 3 years ago.
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## Introduction
Gijswijt's sequence ([A090822](https://oeis.org/A090822)) is famously really, REALLY slow. To illustrate:
* The first 3 appears in the 9th term (alright).
* The first 4 appears in the 220th term (a long way away, but feasible).
* The first 5 appears at (approximately) the **10^(10^23)... |
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Questions without an **objective primary winning criterion** are off-topic, as they make it impossible to indisputably decide which entry should win.
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* This site is for programming contests and challenges. **General programming questions** are off-topic here. You may be able to get help on [Stack Overflow](http://s... |
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Your challenge is simple. Write two programs that share no characters which output each other.
## Example
Two programs **P** and **Q** are mutually exclusive quines if:
1. **P** outputs **Q**
2. **Q** outputs **P**
3. There is no character *c* which belongs to both **P** and **Q**
4. Each program **P... |
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### Challenge
Given a polynomial \$p\$ with real coefficients of order \$1\$ and degree \$n\$, find another polynomial \$q\$ of degree at most \$n\$ such that \$(p∘q)(X) = p(q(X)) \equiv X \mod X^{n+1}\$, or in other words such that \$p(q(X)) = X + h(X)\$ where \$h\$ is an arbitrary polynomial with \... |
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Python Q&A Count
Counts the number of questions and answers related to Python in the dataset, providing insight into the prevalence of Python content.