The Nineteenth Byte - 2019-03-21

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New Main Posts

00:56

0

Q: A program that flips n bytes

This program should flip n bytes from stdin, and write the result to stdout. Example: Before: Hello World After (n = 2, 2 bytes flipped): Hello wOrld

New Sandboxed Posts

01:11

0

A: Sandbox for Proposed Challenges

Byte flipper This program should flip n bytes from stdin, and write the result to stdout. Example: Before: Hello World After (n = 2, 2 bytes flipped): Hello wOrld

Riker

01:59

@mınxomaτ I'm curious whether those are supposed to be variations on greek letters or just... symbols

the upside-down trident thing confuses me, but not more than the horiz line with a vert line through the middle

El'endia Starman

02:15

@Riker "horiz line with a vert line through the middle" --> +

2 hours later…

Jo King

04:06

I wonder what guest271314 did to get a 5 year ban...

FrownyFrog

04:39

asking questions, hilariously

ASCII-only

04:52

@FrownyFrog how do you know O_o

@Riker most of them are capital english letters in case you couldn't tell :| one of them is lowercase a and most of the others are greek. in fact, the first paragraph tells you what each type of symbol means

primo

05:35

80k rep banned for 5 years?

ASCII-only

@primo 80k? O_o

primo

06:04

it's 1 now, but the rep on SO alone was over 80k at the time of the ban

ASCII-only

yeah but... how can you tell

primo

stackoverflow.com/users/2801559/guest271314?tab=topactivity

graph

ASCII-only

oh

primo

maybe he voted for trump, and the mods found out

questions / answers / comments all seem spotless, unless they've been scrubbed in a way that i'm too low rep to see

4 hours later…

Jo King

09:49

looking at chat, it seems there was a lot of accusing people of being white supremicists

and using very confusing terminology while being very pedantic about everyone elses

I'm not too surprised. Whenever I looked at his profile, he was suspended from at least two stacks, or banned from chat

Neil

well, I was going to guess something more benign e.g. his real age was discovered to be too low or he'd requested the suspension because he'd become addicted to SO

Anush

10:04

hiya

Jo King

heyo

Anush

when solving edit distance using dynamic programming, you can think of it like solving a shortest path problem, right?

Jo King

yeah sure, each type of edit is a path, each state is a node

Anush

cool.. I was wondering how hard it would to find all the shortest paths

from the top left to bottom right

with a view to a ppcg challenge :)

finding one is sort of a textbook exercise

Jo King

It's weird, guest271314 says that race is a myth, followed up by

When people use the term "standard" and "non-standard" and "common", that is a signal to suspect them as being white supremacist practitioners

. That actually explains a lot about my interactions with him

Anush

10:11

?

that's a surprising thing to write on ppcg :)

Jo King

nah, not on PPCG

but it's still weird for a chat on etymology

Anush

what about my question directly related to coding! :)

Jo King

sorry, it was related to an earlier discussion

i mean, finding all shortest paths isn't too much different from finding just the shortest

Anush

@JoKing oh ok.. so what do you about it as a ppcg challenge?

Jo King

if you have a limited amount of operations, it's just a breadth first search

Anush

10:14

maybe even to draw them on an ascii version of the dynamic programming table?

Jo King

hmm, i dunno. It would depend on the format. Try posting a draft to the Sandbox, and see what responses you get

Anush

thanks.. I might not as I don't know how to make examples :)

we need a sandbox request for volunteers

where you pose questions and ask for volunteers for examples :)

primo

10:59

wow, that dude is a nutter

user202729

11:14

You're not supposed to talk about people's suspension...

@Anush Just backtrack to get all cases, although there can be exponentially many shortest paths.

Anush

@user202729 sounds good

@user202729 I guess if you are drawing them on an ascii representation of the dynamic programming table then you never have too many edges

user202729

Even if there's not a lot of edges there can still be many paths.

RosLuP

11:34

I am against migration of people... Each one goes in his or her how country if want adjust something... If you want ban me for this: Free

In his her own country in above phrase

primo

i'm currently an immigrant to my country of residence, and also to the country I resided in before this

there are legal channels for immigration, and I think these laws should be enforced

i disagree with a "you were born here, you die here" philosophy

RosLuP

I disagree above: In the country someone born in that country he or she has to die

primo

sometimes people disagree

¯\_(ツ)_/¯

RosLuP

The problem is that what globalization or export problem is not the right way of resolve problems... Yes possible I wrong on this (and I drunk something) but is my politics position

Problems has to be local not global

Anush

11:50

@user202729 right but if you only have to draw the edges the output will not be too large

Fatalize

@JoKing Another example of the kinds of messages from this guy: "One example of another fraud is the "theory" of human skin pigmentation being result of "evolution"

Anush

possibly a troll?

some people just like to get attention by being as outrageous as possible

@Fatalize that was meant to be in reply to this comment

Fatalize

12:08

@Anush He seems way too commited to a troll then :p

Anush

@Fatalize :)

maybe he should be committed

as in en.wikipedia.org/wiki/Involuntary_commitment

in case it didn't translate :)

Veskah

Local Man really Feeling it

ASCII-only

12:43

@Neil :P I think that's only a thing on PPCG. plus usually they don't have anything near 80k rep on SO

New Sandboxed Posts

13:20

0

A: Sandbox for Proposed Challenges

Lay out the Carpet code-golfascii-artstring Inspired by this SO question. Challenge: Input: A string \$s\$ A character \$c\$ Output: Create a diamond-square ASCII art of the string in all four directions, with the first character of the string in the center and going outwards. Which is i...

primo

13:34

ppcg has latex support now?

see for example codegolf.stackexchange.com/q/181885/4098

I thought the idea had been soundly rejected

Anush

@primo they came to a curious compromise about $s

@primo \$n\$ instead of $n$

by making it a little more annoying to type the math they can ensure fewer people do it :)

primo

hah, somehow i doubt that was the primary motivation

Veskah

@primo Shhh, otherwise they'll make it require even more dollar signs and escape characters

primo

aha, too many languages use $ as sigils, makes sense

Anush

13:58

@primo :)

@Veskah good point!

Anonymous

14:11

Perl and PHP would be unusable if $ was the delimiter

J. Sallé

@Mego That sentence suggests PHP is usable in the first place ಠ_ಠ

Anonymous

@J.Sallé It's usable in the same way that a knife embedded in your arm is usable

New Main Posts

0

Q: Multiplicative persistence

Multiplicative Persistence Multiply all the digits in a number Repeat until you have a single digit left As explained by Numberphile: Numberphile "What's special about 277777788888899?" Numberphile "Multiplicative Persistence (extra footage)" Example 277777788888899 → 2x7x7x7x7x7x7x8x8x...

code-golf math arithmetic repeated-transformation

user202729

Does anyone here know about stenography?

Fatalize

14:41

@user202729 Was interested in it at one point but never tried it

RosLuP

It is possible better not to eat cheese... Not eat cheese if don't know personal the sheep 🐑 produce it... Because dioxin can be in what sheep eat and concentrate in milk (nei grassi)

I dreamed of my grandmother telling me not to eat meat and even cheese , some time ago...

I don't know if this can be right out of Italy my nation ... Possible in us or australia cheese is ok

user202729

14:58

@NewMainPosts Re conjecture: I see nothing that limits the number of steps, except finite computation power.

Anush

15:19

argh! My some key combination I have just made the font size in gmail tiny!

anyone know how to revert that?

ctrl-+ rescued me :)

DJMcMayhem

ctrl-0 is even better

Anush

what does that do?

I am scared to try it :)

DJMcMayhem

It just resets the zoom

Anush

oh!

that would have been super useful

noted

1 hour later…

Rick

16:46

what does it mean for a positive integer n to be powerful but not a perfect power?

J. Sallé

17:19

@Rick iirc, a powerful integer n is one such that, if a prime p divides n, then p² also divides n. Perfect powers, on the other hand, are numbers whose prime factors are all the same. So, 8 is both powerful and a perfect power, since 8=2³ (perfect power); also 2 is the only prime divisor of 8 and 2² also divides 8, so 8 is a powerful number.

Giuseppe

@Rick @Rick from wikipedia: "A powerful number is the product of a square and a cube", so perfect powers (k^p, p>1) are powerful but, for instance, 72 = 2^3 * 3^2 is powerful but not a perfect power

J. Sallé

Ah yes, there's that caveat that a²b³ always produces a powerful number

(for a, b≥1)

New Main Posts

1

Q: Japanese Multiplication

There's a visual method for multiplication that is taught to Japanese schoolchildren [citation needed] that uses lines and crossings to get the answer. Image Source Your task is to implement this in ASCII art. You will be given two numbers to multiply. The output should be the corresponding A...

code-golf math ascii-art

1 hour later…

Someone with a Bad Idea

18:46

Does anyone know of a way to remove an infinite trailing run of elements from a t

n infinite list in Husk?

Rick

@J.Sallé would you say for a positive integer n to be powerful but not a perfect power, would it be safe to say the decomposition of a that number whose gcd is = 1 for example 36 [2,2,3,3] and it's gcd is = to 1

J. Sallé

19:03

@Rick I'm not sure you can generalize it like that, but I'm not the best reference for maths. There's a bunch of people here who could answer you for certain though

2 hours later…

Rick

21:29

I think the problem might be too hard.

2 hours later…

ASCII-only

23:31

@Rick 36 is a perfect power though?

@Rick hmm? most golflangs have builtins for factorization

MilkyWay90

@ASCII-only Yep, every real golfing language must have that as a builtin

ASCII-only

@MilkyWay90 no...

MilkyWay90

@ASCII-only It was a joke

ASCII-only

:49596243 i thought you wanted it to not be a perfect power

@MilkyWay90 stenography isn't steganography btw

Rick

@ASCII-only brain fart, your right 36 is not correct

MilkyWay90

23:33

@ASCII-only Typo

ASCII-only

@MilkyWay90 they're asking about stenography

MilkyWay90

Oof I accidentally deleted it

Rick

72 would the smallest first value

then 108

then 200

ASCII-only

@MilkyWay90 stenography: openstenoproject.org

Rick

then 288 etc..

MilkyWay90

23:34

@ASCII-only Oh. Which one would be hiding plaintext in images

oh

ASCII-only

...

MilkyWay90

Aw man

I don't get to do any cryptic looking things since fake-cicada

gitlab.com/thecoder16/cicada/wikis/home

Rick

392,432,500,648,675

MilkyWay90

I do get that "4d5 3d6 5d4 2p5 3p4".split() would be part of an electron configuration for every element in the string

@Rick That's a large number

ASCII-only

@MilkyWay90 that's 5 numbers...

Rick

23:38

@MilkyWay90 they are called Achilles number and Wikipedia says this is the equation min(a1, a2, …, ak) ≥ 2. If in addition gcd(a1, a2, …, ak) = 1 to determine if such a number is valid

MilkyWay90

I was talking about
392,432,500,648,675

@Rick Cool!

ASCII-only

@MilkyWay90 me too...

Rick

no that's just the sequence of appearance

here is up to 5000

MilkyWay90

@ASCII-only Oh okay, I didn't realize those were 5 different numbers and instead thought that it was an actual number separated by commas.

Rick

72, 108, 200, 288, 392, 432, 500, 648, 675, 800, 864, 968, 972, 1125, 1152, 1323, 1352, 1372, 1568, 1800, 1944, 2000, 2312, 2592, 2700, 2888, 3087, 3200, 3267, 3456, 3528, 3872, 3888, 4000, 4232, 4500, 4563, 4608, 5000

MilkyWay90

23:40

Please excuse my misunderstanding

ASCII-only

@Rick a1, a2, ak?

Rick

Achilles number

An Achilles number is a number that is powerful but not a perfect power. A positive integer n is a powerful number if, for every prime factor p of n, p2 is also a divisor. In other words, every prime factor appears at least squared in the factorization. All Achilles numbers are powerful. However, not all powerful numbers are Achilles numbers: only those that cannot be represented as mk, where m and k are positive integers greater than 1. Achilles numbers were named by Henry Bottomley after Achilles, a hero of the Trojan war, who was also powerful but imperfect. Strong Achilles numbers are Achilles...

ASCII-only

hmm

MilkyWay90

@Rick Nice! Do you have a program to generate those?

Rick

however, i can't get the equation to work I think I'm misunderstanding the wiki equation

@MilkyWay90 I'm trying to write a function to verify if it is valid.

MilkyWay90

23:43

@Rick I will make a Python program to calculate whether a number is an Achilles number

Just because I'm bored

Rick

@MilkyWay90 not powerfull

but an Achilles number

MilkyWay90

@Rick Oh

Aw man I've been ninja-ed in Jelly

Rick

@MilkyWay90 wikipedia says this is the solution min(a1, a2, …, ak) ≥ 2. If in addition gcd(a1, a2, …, ak) = 1, but i implemented it and still not getting the correct answer

MilkyWay90

@Rick Oh, what are you getting

Rick

so for 72 i get [2,2,2,3,3]

i pass that to my gcd and get

1

which is correct

but...

MilkyWay90

23:50

@Rick Can you send the program via TIO or pastebin

Rick

I pass 784 I get [2,2,2,2,7,7] pass that to gcd and I get 1 which is incorrect

@MilkyWay90 ya might take a min or 2 never used that before

ASCII-only

@MilkyWay90 close

Rick

@ASCII-only O_O

MilkyWay90

@Rick You should use TIO for answer submissions, it's easy for the reader to access

Rick

@ASCII-only I think those are wrong I pasted the first up to 5000

MilkyWay90

23:55

@Rick He/she said "close" which indicates that it is not correct

ASCII-only

@Rick wait wat

Rick

@MilkyWay90 Oh I did not know that

@ASCII-only sorry I missed read close as closed

MilkyWay90

@Rick Okay

ASCII-only

@Rick where is it wrong tho

hmm i still missed some

Rick

@ASCII-only you don't have 288, 392 ect..

this is what you need to get 72, 108, 200, 288, 392, 432, 500, 648, 675, 800, 864, 968, 972, 1125, 1152, 1323, 1352, 1372, 1568, 1800, 1944, 2000, 2312, 2592, 2700, 2888, 3087, 3200, 3267, 3456, 3528, 3872, 3888, 4000, 4232, 4500, 4563, 4608, 5000

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Mar '1921

The Nineteenth Byte

The Nineteenth Byte: General discussion for codegolf.stackexc...

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