The Nineteenth Byte

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Rogue

00:57

So I hear there are some mathematically inclined folks in here

I am in quite a pinch, as I have an assignment due soon and a brainfart to go along with it

In diff eq, I know the homogeneous and particular solutions are both independently solutions as well as together

I've gotten down to a general solution with three unknown constants, but I only have two initial conditions, and I'm wondering if I can separately solve for the constants in the two solutions

5 hours later…

New Main Posts

05:50

Q: Parallel resistance in electric circuits in C

What are some tips on how to shorten this code even further? The code is meant to compute the parallel resistance of an electric circuit. Using scanf float r;main(){float a;scanf("%f",&a);r+=1/a;printf("%f",1/r);main();} Using command-line arguments #include<stdlib.h> float r;main(c,v)char**...

8 hours later…

A̲̲

13:46

@Jono2906 I have answer-spammed this challenge, so if this rule was wrong, I need to delete all of my answers.

Adám

CMC: φ-φπ

A̲̲

Phi minus phi pi

Adám

@A̲̲ In what language?

A̲̲

@Adám In ~~English~~ Mathematical notation.

Quintec

@Adám Arguably Wolfram Language? :P

Adám

13:51

@A̲̲ The English programming language is generally not allowed on CGCC.

@A̲̲ No that'd be what I wrote.

To clarify: return approximately -3.46517, but with your normal precision.

Quintec

@Adám Japt, 7 bytes yikes this is long

Adám

@Quintec Wow, that's one cool looking Japt interpreter.

Quintec

Shaggy is awesome

A̲̲

My head is exploding

PhiNotPi

Next week I'm gonna be interviewing an undergrad for a research position. (This isn't exactly a job, but kinda is because they'd be receiving course credit.) This particular person has an appropriate major (they're a neuro major and this is a neuro lab) but they lack coding experience though, which is an issue when coding is 95% of the actual work. So that brings me to my question: how can one judge innate coding talent / self-learning potential in an interview?

A̲̲

14:05

@PhiNotPi Look at their reputation on CGCC during the interview.

Adám

@PhiNotPi Btw, my CMC was in honour of you. Can you spot how?

A̲̲

φ(-π) is arguably more appropriate.

PhiNotPi

phi(1-pi)

Adám

@A̲̲ How does "not" translate to subtraction?

@PhiNotPi exactly.

@A̲̲ Why the odd username? How about Ⓐ?

A̲̲

@Adám A username must at least be 3 unicode characters...

Adám

14:11

@A̲̲ Ah, I didn't know. And I suppose zero-width spaces are banned?

A̲̲

I guess so.

Maybe I should try to change to Ⓐ... I haven't tried it yet.

(Or insert 0-width spaces between A and _.)

Adám

CMC: Simple super/subscript "TᴇX"-to-Unicode — you have to handle a single level of ^ and _ with single digits and multi-digits in braces. E.g. 3x_{10}^2 → 3x₁₀² and 10_211_2 → 10₂11₂

ngn

@PhiNotPi industry has been trying to find out how for decades and they still do it (wrong) by giving silly puzzles at interviews

Adám

@PhiNotPi You could ask "How would you approach the problem …" and let them talk you through their thought process.

A̲̲

CMC: Simple italic-to-unicode - You have to handle one level of italic asterisks and convert the text to unicode italics. E.g. *fM* -> ƒℳ

Adám

14:29

Q: 𝘜𝘯𝘪𝘤𝘰𝘥𝘦 𝗠𝗮𝗿𝗸𝗱𝗼𝘄𝗻 F̲o̲r̲m̲a̲t̲t̲e̲r̲ (*Unicode* **Markdown** __Formatter__)

If you cannot see this post, you can use this image Your task is to create a markdown parser that outputs Unicode. It should support 𝗯𝗼𝗹𝗱, 𝘪𝘵𝘢𝘭𝘪𝘤, 𝙼𝚘𝚗𝚘𝚜𝚙𝚊𝚌𝚎, and 𝗎̲𝗇̲𝖽̲𝖾̲𝗋̲𝗅̲𝗂̲𝗇̲𝖾̲. Every alphabetical character should be converted into Math Sans. This includes the c...

code-golf string unicode

@A̲̲ What are the rules for beginning and ending italics? All asterisks swap mode?

A̲̲

Since it is a duplicate...

CMC: Find the first unanswered CMC in TNB.

CMC: Implement a left-going marquee. [] indicate the range of a marquee. E.g. a[abcd] Generates a marquee. Steps after N seconds (N is a decimal less than 1 which is set by you): abcda -> acdab -> adabc -> aabcd and then loops back forever.

Adám

@A̲̲ It isn't. It is significantly easier.

A̲̲

@Adám This is a subset of the challenge.

Adám

@A̲̲ Not a bad thing.

@A̲̲ …/search?q=marquee

A̲̲

So only one is a non-duplicate CMC.

1 hour later…

Poke

15:46

anyone doing AOC2019?

DJMcMayhem

@Poke Yeah, a lot of people have been discussing it on the discord server

discord.gg/KUj9ua

Poke

16:09

just what i didn't need... another discord channel

lulz

DJMcMayhem

A month ago it was ded™, but with the recent anti-SE sentiment floating around it's been revived

Poke

have there been any updates on that

sometimes i look at meta

ngn

16:30

@Poke yes

Adám

@DJMcMayhem Are you saying there's discord with SE?

DJMcMayhem

Ha, apparently

Adám

Seriously though, Discord is like an alternative location for CGCC chat?

DJMcMayhem

@Adám Kind of?

It's an unofficial server for PPCG people, and some people prefer to user that over anything SE affiliated

Adám

Unfortunately, it also fragments the community, well chat, at least. I suppose main challenges still live on SE for now.

Is there a Discord copy level above "BEYOND GODLIKE!!!!"?

2 hours later…

Skidsdev

18:39

@DJMcMayhem there's an anti-SE sentiment floating around?

DJMcMayhem

Start here

Skidsdev

jesus

maybe I should re-join the PPCG discord

New Main Posts

19:24

Q: Write a C# program to below given

The Infected Plant Given a field divided into m rows, n columns, each cell containing h (denoting a healthy plant), i (denoting a infected plant) or x (denoting empty spot), find the number of days required to turn all healthy plants to infected. In one day, a infected plant can infect neighbori...

1 hour later…

New Main Posts

20:25

Q: Next Shared Totient

The totient function \$\phi(n)\$, also called Euler's totient function, is defined as the number of positive integers <=n that are relatively prime to (i.e., do not contain any factor in common with) n, where 1 is counted as being relatively prime to all numbers. (from WolframMathworld) Challeng...

code-golf number-theory

Neil

21:02

@A̲̲ This CMC doesn't appear to have been answered yet. Should previous CMCs already be answered or become answered first, that would make this the first unanswered CMC. However, it would then become impossible to answer, as any answer would by definition be incorrect.

New Sandboxed Posts

21:17

A: Sandbox for Proposed Challenges

Sandbox note: I've seen a few similar challenges, particularly Shortest universal maze exit string, that's why I think this fits into this site, but I'm not sure. The tags could be 'code-challenge', 'grid', 'challenge', 'game'. Should I also provide a way to verify solutions with some standard in...