Код Гольф: Ваш власний улюбленець ASCII змія


34

Отже, я написав собі однолінійку, яка надрукувала змію на консолі. Це трохи весело, і мені було цікаво, як я можу згубити свій код ...

Ось (короткий) приклад результату:

                +
                 +
                  +
                   +
                   +
                   +
                  +
                   +
                    +
                    +
                    +
                     +
                     +
                      +
                      +
                       +
                      +
                     +
                     +
                    +

Ось характеристики:

  • У кожному рядку на консолі друкується по одному символу, який не пробігає (що б вам не хотілося), спочатку з 29 - 31 пробілами зліва від нього.
  • Кожна ітерація, випадкове рішення приймається між цими трьома діями
    • Кількість оббивки зменшується на 1
    • Кількість оббивки залишається однаковою
    • Кількість оббивки збільшується на 1

Зробіть це 30 разів, щоб надрукувати змію на 30 сегментів до консолі.

Виграє найкоротша відповідь у байтах.


Чи можемо ми повернути масив ліній? Чи дозволені провідні / пробіли чи нові рядки?
Кудлатий

1
Я припускаю, що пробіли в кожному рядку дозволені, правда?
Луїс Мендо

1
Що означає "випадковий"? Однорідно випадкові? Випадково від будь-якого розподілу з позитивною підтримкою щодо кожного з трьох результатів? Випадкові від будь-якого розповсюдження? Чи мають результати бути різними для кожного запуску програми?
Натаніел

1
Зауважте, що за замовчуванням випадкове не означає рівномірно . Наприклад, друга частина моєї відповіді на голову є (на сьогоднішній день) цілком справедливою, незважаючи на те, що вона генерує пряму лінію більшу частину часу.
Джо Кінг

1
Прямо зараз, є два моменти , які неясні: 1) Чи має випадкове середнє рівномірно випадковим? (впливає на цю відповідь ) та 2) Чи повинен результат кожного разу бути різним? (тобто чи може генератор випадкових чисел не використовувати насіння? Впливає на цю відповідь )
DJMcMayhem

Відповіді:


14

05AB1E , 15 14 байт

30DF2Ý<+ΩD0sú,

Спробуйте в Інтернеті!

Використання 0.

Пояснення

30DF2Ý<+ΩD0sú,
30D            # Push 30 to the stack (One for the amount of iterations we are going to perform and one for the initial padding)
   F           # Pop one of the 30s and perform the following that many times...
    2Ý          # Push [0,1,2] ...
      <         # and create [-1,0,1] from that
       +        # Add the last padding to every entry (e.g. 30 in the beginning resulting in [29,30,31]
        Ω       # Pick one of the results at random ...
         D      # and push it to the stack twice
          0     # Push 0 (Any character will work fine here) ...
           sú   # and pad it with the randomly chosen amount of spaces in the front
             ,  # Finally print the result with a trailing newline

38
05AB1E: 0-байт, спробуйте в Інтернеті! ... чекай, ні, майже хоч.
Чарівний восьминога Урна

14

Випадковий Brainfuck , 123 122 121 байт

+[--[<]>>+<-]>+[->+>+>+<<<]++++++++++>>++<[>>[->+<<.>]>[-<+>]>?>+++<[>->+<[>]>[<+>-]<<[<]>-]>-->,<[-<<<+>>>]<<<<+.-<<.>-]

Спробуйте в Інтернеті!

Random Brainfuck - це розширення brainfuck, з корисним доповненням ?команди, яка встановлює поточну клітинку у випадковий байт. Це друкує змію, зроблену з! s, яка більше схожа на кроки, ніж змія досить смішно.

Як це працює:

+[--[<]>>+<-]>+ Create the value 30
[->+>+>+<<<]    Copy it three times
++++++++++      Create a newline cell
>>++<            Adds 2 to the second copy to make it a space and move to the counter
[ While counter
  >>[->+<<.>]>[-<+>] Print out the padding cell number of spaces
  ?>+++<[>->+<[>]>[<+>-]<<[<]>-] Get 3-(random byte%3)
  >-->,<[-<<<+>>>]   Add (result-2) to the padding cell
  <<<<+.-<           Print an exclamation mark
  <<.                Print a newline
  >-                 Decrement counter
] end loop

Ще одне рішення, яке дотримується букви питання, а не духу.

87 байт

+[--[<]>>+<-]>+[->+>+>+<<<]++++++++++>++>[>[->+<<<.>>]>[-<+>]?[,<+>]?[,<->]<<<+.-<.>>-]

Спробуйте в Інтернеті!

Цей сильно схильний до того, щоб залишити прокладку в спокої, але збільшити або зменшити прокладки є однаково можливими. Кожен з них має трохи менше 1 на 256 випадків.


Дуже хороша! Я не знав про ?команду. +1
Грант Міллер

@GrantMiller ?доступний лише у Random Brainfuck , а не у класичному мозковому ебатьє
Jo King

8

C (gcc) , 61 58 56 байт

Відповідь відредаговано, щоб відобразити зміни правил ...

i;f(s){for(s=i=31;--i;printf("%*d\n",s+=1-rand()%3,8));}

Спробуйте в Інтернеті!


збережіть байт, перейшовши s+=1-rand()%3до функції printf. i;f(s){for(s=i=31;--i;)printf("%*c\n",s+=1-rand()%3,43);}
Ваелюс

@Vaelus Це означає, що перший рядок замість 30, зазначених у питанні, має різну кількість пробілів.
Steadybox

@Steadybox Що дозволено в коментарях, мабуть, ..
Кевін Круїйсен

7

Сітківка , 24 байти


30* +
-29{¶<`^
 
S,2@1`

Спробуйте в Інтернеті!

Пояснення


30* +

Ініціалізуйте робочий рядок до першого рядка, тобто 30 пробілів і a +.

-29{¶<`^
 

На другому рядку є пробіл. -29{загортає решту програми в цикл, який запускається 29 разів. ¶<друкує робочу рядок на початку кожної ітерації циклу за допомогою зворотного каналу. Сама атомна стадія вставляє пробіл на початку рядка (основна ідея - вставити один простір, а потім випадковим чином видалити 0–2 пробіли, тому що це байт коротший, ніж випадковий вибір між видаленням, вставкою та відключенням).

S,2@1`

Це відповідає порожньому регексу проти введення, який дає нам кожне положення між символами (і початком і кінцем рядка). Потім ,2зберігає лише перші три матчі, тобто матчі після нуля, одного та двох пробілів. @вибирає випадковий один із цих трьох збігів. Потім роздвоєний етап (S ) розбиває вхід навколо цієї збіги. І 1говорить йому, щоб зберегти лише другу частину розколу. Іншими словами, ми відкидаємо все до нашого випадкового збігу.

30-й рядок, який є результатом остаточної ітерації циклу, друкується неявно в кінці програми.


Ви знаєте, що навіть коротше, ніж видалення пробілів 0--2? Перемішати простори навколо! . До речі, нова Retina чудова: D
Лев

7

VBA, 60 59 49 байт

For l=1To 30:?Spc(30+i)"+":i=i+Sgn(Rnd()-.5):Next

Вставте його у вікно Негайного і натисніть клавішу Enter. (Переконайтесь, що явна декларація вимкнена!)

Набагато більше шансів рухатись, ніж залишатися в лінії (тобто дії не мають однакової ваги), але це не було визначеною вимогою (на щастя!)

{EDIT} Saved 1 byte by removing the space between =1 and To

{EDIT2} Saved 10 bytes thanks to remoel's comment

Old Versions:

'V1
i=30:For l=1 To 30:?String(i," ")&"+":i=i+Sgn(Rnd()-.5):Next
'V2
i=30:For l=1To 30:?String(i," ")&"+":i=i+Sgn(Rnd()-.5):Next

5
Welcome to PPCG!
Martin Ender

2
You can save a few bytes by replacing String(i," ") to Spc(30+i) then remove i=30: . Or -1 byte by removing & . :)
remoel

7

C# (.NET Core), 112 110 106 100 99 98 bytes

v=>{var r="";for(int t=30,i=t;i-->0;r+="+\n".PadLeft(t+=new System.Random().Next(3)-1));return r;}

-1 byte thanks to @raznagul.
-1 byte thanks to @auhmaan.

Explanation:

Try it online.

v=>{                      // Method with empty unused parameter and no return-type
  var r="";               //  Result-string, starting empty
  for(int t=30,           //  Temp-integer, starting at 30
      i=t;i-->0;          //  Loop 30 times
    r+=                   //   Append the result-String with:
       "+\n"              //    The character and a new-line,
            .PadLeft(     //    left-padded with `t` spaces,
                     t+=new System.Random().Next(3)-1));
                          //    after `t` first has been changed with -1, 0, or 1 randomly
  return r;}              //  Return the result-string

One strange thing: If I call new Random().Next() multiple times locally (.net Framework Version 4.6.1) I always get the same result. I need to add a Thread.Sleep(10) between the call to reliably get different results. With a sleep time of less than 10ms I sometimes still get the same result. So .net-Framework and TIO (.net-Core) have different PRNGs or at least use different seeds. If I switch your program in TIO to C#-mono I get the same behavior as I get locally in .net-Framework.
raznagul

@raznagul Hmm, that output with C# (Mono C# compiler) is indeed weird..
Kevin Cruijssen

3
@raznagul new Random() uses the time as the seed so in a tight loop the time is the same and so the result is the same.
TheLethalCoder

@TheLethalCoder: Yes, that is what I (more or less) expected. The strange things are that 1) .net-Core (at least on TIO) behaves differently. 2) That I need Thread.Sleep(10) to reliably get different results and Thread.Sleep(1) or even 9ms is not enough.
raznagul

@raznagul Well sleeping for 1, 9 or 10ms should all sleep for the same time depending on other processes running... odd indeed.
TheLethalCoder

7

C, 56 bytes

n;f(p){n>29?n=0:f(printf("%*d\n",n++?p-rand()%3:31,0));}

Try it online!

Explanation:

n; // As a global variable, n is initialized to zero.
f(p)
{
    // Call the function recursively until n > 29.
    n > 29

        // At the end, set n back to zero.
        ? n=0

        // On the first iteration, n == 0 and p has an indeterminate value.
        // 'n++ ? p-rand()%3 : 31' returns 31 (without reading p), and thus
        // 30 spaces get printed. printf() returns the number of characters
        // printed, 32 (30 spaces + '0' + '\n').
        //    On subsequent iterations, p has the value the previous printf
        // call returned, which is the padding on last iteration + 2. Also,
        // n > 0, so the same expression now returns p-rand()%3, and thus
        // the padding changes either by -1, 0, or 1 spaces. The function
        // is again called with the value of the current line's padding + 2.
        : f(printf("%*d\n", n++ ? p-rand()%3 : 31, 0));
}

C (gcc), 55 bytes

n;f(p){n=n<30&&f(printf("%*d\n",n++?p-rand()%3:31,0));}

Depends on f "returning" the value assigned to n in the function, which is undefined behaviour, but works consistently with gcc when no optimizations are enabled.

Try it online!


6

JavaScript (ES8), 63 62 60 bytes

Includes a trailing newline. *2-1 could be replaced with -.5 for a 1 byte saving but the chances of each line being the same length as the previous line would be greatly increased. Of course, as "random" isn't defined in the challenge, the RNG could be replaced with new Date%3-1 for a total byte count of 55.

f=(x=y=30)=>x?``.padEnd(y+=Math.random()*2-1)+`+
`+f(--x):``

Saved a byte thanks to someone who deleted their comment before I could catch the name. I'd actually tried it this way with repeat and padStart but didn't think to try padEnd - don't know why!


Bonus

For the same number of bytes, here's a version that takes the number of starting spaces & iterations as input.

f=(x,y=x)=>x?``.padEnd(y)+`+
`+f(--x,y+Math.random()*2-1):``


f=(x=y=30)=>x?`+\n`.padStart(y+=Math.random()*2-1)+f(--x):`` is one byte shorter. (Note: Since SO doesn't allow line breaks in comments, I had to type \n instead of actually using a line break.)
Stefnotch

Thanks, @Stefnotch. Unfortunately, even with an initial value of y=31, there would be a possibility of the first line being too short. tio.run/##BcFLDsIgEADQvSeZkUCs7kzQE7hyqSYzKfRjKBCYGHp6fO/…
Shaggy

1
Correct me if I'm wrong, but doesn't your current solution also suffer from that issue?
Stefnotch

1
The first line should have exactly 30 spaces, according to the challenge.
Nit

1
@Nit, the OP has confirmed that the first line may contain 29-31 spaces but has yet to edit that fact into the challenge, despite repeated requests to do so.
Shaggy

6

Java 8, 89 87 bytes

First golf, I'm sure it could be much better..

Edit: Fixed first line thanks to Steadybox.

l->{for(int a=31,b=a;--a>0;){System.out.printf("%"+b+"c\n",'+');b+=2-Math.random()*3;}}

Try it online!

 l->{                                           //Begin lambda
    for(int a=31,b=a;--a>0;)                  //Initialise vars, loop through 30 lines
    {
        System.out.printf("%"+b+"c\n",'+');     //Print result
        b+=2-Math.random()*3;                   //Change padding by -1, 0, or 1
    }

5
Welcome to PPCG! :)
Shaggy


6

Python 2 , 83 65 64 bytes

Straightforward approach:

import os
k=30
exec"print' '*k+'+';k+=ord(os.urandom(1))%3-1;"*k

Try it online!

Thanks to @Rod for saving some bytes! Thanks to @ovs for -1 byte!

Edit: changed variable name and output string to the letter 's'

More snake-like output for 88 bytes:

from random import*
s=[30,0]
exec"print' '*sum(s)+'(S)'[s[-1]+1];s+=[randint(-1,1)];"*30

1
I like this. Really neat solution.
linemade


5

Charcoal, 14 bytes

× ³⁰F³⁰«↙+M‽³→

Try it online! Link is to verbose version of code. Explanation:

× ³⁰            Print 30 spaces (forces the desired indentation)
    F³⁰«        Repeat 30 times
        ↙+      Print a `+` and move down and left one square
          M‽³→  Move right a random number of squares from 0 to 2

Would be only 10 bytes if there was no initial indentation requirement.


@KevinCruijssen Hmm, that's awkward, because Charcoal likes to trim by default.
Neil

5

PHP, 61 bytes

for($p=32;$i<30;$i++)echo str_pad("+
",$p+=rand(-1,1),' ',0);

Try it online!


8
$i<30;$i++ can be $i++<30; to save 2 bytes.
Kevin Cruijssen

2
55 bytes: for($p=30;$i++<30;$p+=rand(-1,1))printf("%{$p}s\n",'+'); (the \n is counted as 1 char, and should be replaced by a real newline)
Ismael Miguel

2
Alternative 55-byte long, without warnings: for($i=$p=30;$i--;$p+=rand(-1,1))printf("%{$p}s\n",'+');
Ismael Miguel

5

Java 8, 131 129 127 126 119 108 101 bytes

v->{String r="";for(int i=30,j,t=i;i-->0;r+="+\n")for(j=t+=Math.random()*3-1;j-->0;r+=" ");return r;}

Explanation:

Try it online.

v->{                     // Method with empty unused parameter and String return-type
  String r="";           //  Result-String, starting empty
  for(int i=30,j,t=i;    //  Two index integers, and a temp integer (starting at 30)
      i-->0;             //  Loop 30 times:
      r+="+\n")          //    After every iteration: Append the character and a new-line
    for(j=t+=Math.random()*3-1;
                         //   Change `t` with -1, 0, or 1 randomly
        j-->0;r+=" ");   //    And append that many spaces to the result-String
  return r;}             //  Return the result-String

Old 119 byte answer:

v->{String s="",r=s;int i=90,t=30;for(;i-->t;s+=" ");for(;i-->0;t+=Math.random()*3-1)r+=s.substring(t)+"+\n";return r;}

Explanation:

Try it online.

v->{                      // Method with empty unused parameter and String return-type
  String s="",            //  Temp-String, starting empty
         r=s;             //  Result-String, starting empty
  int i=90,t=30;          //  Temp integer, starting at 30
  for(;i-->t;s+=" ");     //  Fill the temp String with 60 spaces
  for(;i-->0;             //  Loop 30 times:
      t+=Math.random()*3-1//    After every iteration: Change `t` with -1, 0, or 1 randomly
    r+=s.substring(t)     //   Append the result with `60-t` amount of spaces
       +"+\n";            //   + the character and a new-line
  return r;}              //  Return the result-String

4

R, 72 69 67 bytes

cat(sprintf(paste0("% ",cumsum(c(30,sample(3,29,T)-2)),"s"),"+\n"))

Thanks to Zahiro Mor for 2 extra bytes!

Try it online!


Switching from sample(3,29,T)-2 to runif(29,-1,1) will reduce byte count by 2 but moves are not equally likely anymore. And could you also switch to paste("%" instead of paste0("% " or am I missing something here?
Rift

@Rift if i was using paste the resulting strings would be of the form % 30 s instead of % 30s. As you said runif would mess up the probabiities.
plannapus

Locally sprintf("%30s"), sprintf("% 30s") and sprintf("% 30 s") return the same results for me. But on TIO only the first two have identical results, so paste0("%" should save a byte. And there is no requirement that every move has the same probability.
Rift

4

Japt, 13 bytes

Returns an array of lines.

30ÆQù1nH±1n3ö

Test it


Explanation

30Æ               :Create the range [0,30) and pass each through a function
   Q              :  The " character
    ù             :  Pad start to length...
           3ö     :    Random element from the range [0,3)
         1n       :    Subtract 1
       H±         :    Add the result of that to H (inititally 32)
     1n           :    Subtract 1 to avoid the possibility of the first line being 33 characters long in total

Bonus

For 2 bytes less, here's a version that takes the number of starting spaces & iterations as input.

U°ÆQùU±1n3ö

Try it


Alternative RNGs

The last 4 bytes can be replaced with any of the following:

MrJ1     :A random float between -1 and 1
Jõ ö     :Generate the range [-1,1] and return a random element
3ö É     :An alternative way of writing the method used above
½nMr     :0.5 subtracted from a random float between 0 and 1

1
Wow, can't believe we're winning at the moment! I think you can save a byte with this (on mobile so I can't really verify)
ETHproductions

@ETHproductions: Ha! That's identical to what I started out with. The problem is, though, if -1 is returned by the RNG on the first iteration, we'll end up with a total line length of 29 when it should be 30, 31 or 32.
Shaggy

Hmm, I'm confused about how your version gets around that then... Also, I believe OP has clarified in the comments that they don't care if an extra space is removed or added in the initial iteration.
ETHproductions

Actually I'm confused by "when it should be 30, 31, or 32"—where is that required?
ETHproductions

@ETHproductions: We start with 30 and then add -1, 0 or 1 giving us 29, 30 or 31 - add the " and that gives us a total length of 30, 31 or 32 for the first line.
Shaggy

4

Swift, 101 bytes

import UIKit
var g=29;for _ in 0...g{print((0..<g).map{_ in" "}.joined(),0);g+=Int(arc4random()%3)-1}

Explanation

A full program. This uses a rather odd trick: arc4random() is a member of the Darwin module, but UIKit also comes with this function installed, so it saves a byte :) Also uses one of my Swift golfing tips for repeating strings an arbitrary number of times.

import UIKit        // Imports the UIKit module, necessary for the RNG.
var g=29;           // Declares an integer variable g by assigning it to 30.
for _ in 0 ... g {  // Execute the code block 30 times (for each integer in [0; g]):
 print(             // Output the following:
  (0..<g).map       // For each integer in [0; g)...
   {_ in" "}        // ... return a literal space character. 
    .joined()       // ... And join the result to a single string.
             ,0     // Also print a "0" preceded by a single space (g starts from 29).
 );
g+=                 // Increment the variable g by...
   arc4random()%3   // ... A random integer, modulo 3...
   Int(...)-1       // ... Casted to an integer (yes, this is needed!) and decremented.
}

Doesn't for _ in 0 ... g execute the code block 29 times now instead of 30 (loop from 0 to 29 (exclusive))?
Kevin Cruijssen

@KevinCruijssen No, 0...g generates all the integers in [0; g]. My bad, fixed the explanation. 0..<g would generate the integers in [0; g) :P
Mr. Xcoder

Ah, the [0; g) you've edited to [0; g] indeed confused me. :) Hmm, but isn't it possible to start at g=30 and loop [1; g] in that case?
Kevin Cruijssen

@KevinCruijssen Looping over either [0; g) or [1; g] would definitely be possible if I choose g=30 instead, but then print(...,0) needs to be changed to print(...+"0"), because an additional (extraneous) space would be prepended before the 0 otherwise. Either way, the byte count remains the same.
Mr. Xcoder

4

Perl, 36 bytes

perl -E '$#a=29;map{$#a+=rand(3)-say"@a -"}@a'

So good. I always forget you can set an array length like that... and using say for subtraction. Am I right in thinking it doesn't change the number of runs when $#a is incremented because it's not a reference?
Dom Hastings

@DomHastings: It's because I use map which seems to first lay out the elements on the stack. for does not and would have had an unpredictable loop length
Ton Hospel

That's really useful to know. Thanks!
Dom Hastings

Nice golfing. I tried to shave off another byte with perl -E 'map{$#a+=rand(3)-say"@a -"}@a=1..30', but that sometimes (not every time) resulted in segmentation fault. Could it be a bug in perl v5.22.1 and v5.16.3?
Kjetil S.

@Kjetil Yes, that is a well known problem that probably will never be fixed. When looping an array the entries don't get an extra refcount, so if you delete them they are freed by the time the loop reaches them and you hit freed memory. Fortunately you never do this in real programs.
Ton Hospel

4

R, 54 53 bytes

cat(sprintf('
%*s',cumsum(c(30,sample(3,29,T)-2)),0))

Similar idea as above, but with shortened sprintf code and a shorter character string literal. Instead of \n (two bytes) I’m using a literal line break (one byte).

Try it online!


A field width or precision (but not both) may be indicated by an asterisk *: in this case an argument specifies the desired number. I've been using sprintf for years and somehow always missed that part... Thanks for the reminder!
plannapus

1
The second line is sometimes indented two spaces instead of one.
Scott Milner

@ScottMilner Found some time to fix it.
Konrad Rudolph

4

Ruby, 45 39 bytes

x=30
x.times{puts' '*(x+=rand(3)-1)+?S}

Try it online!

Modifying x during the loop does not affect the loop counter. I chose S as a particularly snakelike output character.

-6 bytes: Use rand(3)-1 instead of [-1,0,1].sample. Thanks, Eric Duminil!


You can save two bytes with x.map instead of x.times (equivalent since you don't use the return value)
RJHunter

1
Oops, you're right, ignore me!
RJHunter

1
OK I've got a better one: rand -1..1 is five bytes shorter than [-1,0,1].sample
RJHunter

1
@RJHunter: Or rand(3)-1 for 6 bytes less.
Eric Duminil

1
(x=30).times{puts' '*x+?+;x+=rand(3)-1} (same size) will print exactly 30 spaces for the head of the snake as requested by the challenge
Asone Tuhid

4

SenseTalk, 237 198 Bytes

This is a language that I came to know and love about a decade ago. It's the scripting language that drives the automated testing tool Eggplant Functional. I was an avid user of the tool for many years before joining the company for a while. It's not the most golf-capable language, but I find it very enjoyable to write in. Golfing in it is actually quite challenging as the language is meant to be verbose and English-like... took me quite a while to get it down to 237 bytes.

set s to "                              +"&lf
set p to s
repeat 30
set a to random(0,2)
if a equals 0
delete first char of p
else if a equals 1
put " " before p
end if
put p after s
end repeat
put s

Ungolfed/Explanation

set the_snake to "                              +"&lf #assign the first line of the snake
set previous_line to the_snake                        #set up for the loop

repeat 30 times                                       #loop 30x
    set action to random(0,2)                         #random add/subtract/stay the same

    if action equals 0
        delete the first character of previous_line   #SenseTalk really shines at string manipulation
    else if action equals 1
        put " " before previous_line                  #insert a character at the beginning
    end if

    put previous_line after the_snake                 #plop the new segment into the string
end repeat                                            #close the loop

put the_snake                                         #print to standard out

Edit: Saved 36 bytes thanks to @mustachemoses


1
Is the whitespace necessary?
MustacheMoses

I've a lot of respect for this. Particularly against the background of 'golfing languages' which seem to exist to be utterly unreadable, but short. It's nice to have an example that's just showing what you can do with your language.
AJFaraday

1
Good call @MustacheMoses! Updated.
Allen Fisher

I count 198 bytes (well, the userscript counts that many)
HyperNeutrino

@AllenFisher Do you have a standalone interpreter or compiler for this language that I can use without getting a Eggplant demo?
MustacheMoses


3

PowerShell, 42 bytes

1..($l=30)|%{" "*$l+"x";$l+=-1,0,1|Random}

Try it online!

Loops from 1 to $l=30. Each iteration we put $l spaces plus an x onto the pipeline as a string, then += either of -1, 0, 1 based on Get-Random into $l for the next loop. Those strings are gathered from the pipeline and an implicit Write-Output gives us a newline-separated list for free.



3

Jelly, 18 bytes

1ŒRX+
30ǒС⁶ẋ;€0Y

Try it online!

The chosen character is 0. If returning a list of list of characters is allowed, then the Y can be dropped and the submission can be turned into a niladic chain for 17 bytes. Alternative.

How it works

30ǒС⁶ẋ;€0Y | Niladic main link.
30           | Starting from 30...
  ǒС       | ... Repeat the helper link 29 times and collect the results in a list.
             | (This list includes the first 30, so there are actually 30 numbers).
      ⁶ẋ     | Repeat a space that many times, for each item in the list.
        ;€0  | Append a 0 to each.
           Y | And join by newlines.
-------------+
1ŒRX+        | Monadic helper link. Alternatively, you can use µ1ŒRX+µ instead of the Ç.
1            | The literal one.
 ŒR          | Symmetric range from –1 to 1.
   X+        | Choose a random number therein and add it to the argument.

Jelly, 16 bytes

Combining mine, Erik’s and Jonathan’s solutions, we can golf this down to 16 bytes. The chosen character is 1.

’r‘X
30ǒСṬ€o⁶Y

Try it online!

Thanks to Jonathan Allan for the heads-up (on Ṭ€o⁶).


You could use Ṭ€o⁶ in place of ⁶ẋ;€0 like my 18 byter does and get to down to 17.
Jonathan Allan

@JonathanAllan Thank you! Combining the three Jelly answers, I actually ended up having 16 bytes. But I posted that as a secondary solution because it is not entirely mine. :-)
Mr. Xcoder

3

Octave, 53 51 50 49 bytes

printf('%*d\n',[a=31+cumsum(randi(3,1,30)-2);~a])

Try it online!

Saved 1 byte by no longer doing any looping. Saved another as Octave has printf as well as fprintf.

This new code creates an array of 30 random integers in the range -1:1. It then cumulatively sums the array and adds 30, which gives the desired sequence.

The result is printed using fprintf with a format that says "A decimal number, padded to a specified width, followed by a new line. The width will be the first value input, and the decimal number will be the second value input. If the number of values input is more than this, Octave will keep repeating the print automatically to get the desired output.

To achieve the looping then, we need only interleave zeros between the sequence array so the fprintf function uses each value in the sequence as a width, and each zero as the digit to be printed.

Prints an output like:

                              0
                             0
                              0
                             0
                              0
                               0
                              0
                               0
                              0
                              0
                             0
                            0
                           0
                           0
                           0
                          0
                           0
                            0
                             0
                              0
                              0
                             0
                             0
                              0
                               0
                              0
                              0
                               0
                               0
                                0

The above code doesn't always print exactly 30 spaces on the first line. It will be either 29, 30, or 31. To correct that, you would use this 53 byte version:

x=31;for i=2:x;fprintf('%*d\n',x,0);x+=randi(3)-2;end

You can save two bytes: x=31;for i=2:x;fprintf('%*d\n',x+=randi(3)-2,0);end
Kevin Cruijssen

@KevinCruijssen I thought about that, but it doesn't work the same. It would result in the first line starting with either 29, 30, or 31 spaces.
Tom Carpenter

1
@KevinCruijssen in fact, never mind. I've just noticed the OPs comments saying that is allowed.
Tom Carpenter

Yep. It's a bit annoying a rule is in the comment (especially since it contradicts with the current challenge description..). I've asked OP to edit the challenge to reflect you can start with 29, 30 or 31, since he seems to allow it in the comments.
Kevin Cruijssen

3

Lua, 81 75 bytes

n=30;for i=1,n do print(("%-"..n.."s+"):format(" "))n=n-2+math.random(3)end

In for i=1,n ... the to_exp n is evaluated only once before entering the loop, saving one byte.

-6 thanks to @user202729

Try it online!


1
Welcome to PPCG! You may want to add a TIO link to your post so people can test your program more easily.
user202729

You can golf your answer down to 76 bytes. Besides the page Tips for golfing in Lua may be useful.
user202729


3

Python 3.6, 84 73 69 bytes

from random import*
x=30
exec("print(' '*x+'+');x+=randint(-1,1);"*x)

Thanks to @WheatWizard for -11 bytes. Thanks to @JoKing for -4 bytes.


Since you don't end up using i you can use for i in[1]*30 instead to save bytes.
Wheat Wizard

You can also from random import* so that you don't need the random. later on. And you can remove the newline space after your :.
Wheat Wizard

And if you change 30 to 29 the "+".rjust(x) can be replaced with " "*x+"+".
Wheat Wizard

Actually regarding my last comment it should be 30 spaces not 29. Your current answer only puts 29 spaces and thus fails to meet the spec. This can be fixed by changing 30 to 31.
Wheat Wizard

1
@WheatWizard Thanks! I've added your changes and credited you as well. I changed [1]*30 to [1]*x because it's one byte shorter.
MustacheMoses

3

ES5, 97 95 81 bytes

for(p=i=30;i--;)console.log(Array(p).join(" ",r=Math.random()*3|0,p+=r>1?-1:r)+0)

ES5, 112 98 bytes if function format is needed:

function a(){for(p=i=30;i--;)console.log(Array(p).join(" ",r=Math.random()*3|0,p+=r>1?-1:r)+0)}a()


2
Welcome to PPCG! I think your variables have to be declared inside of a function - _=>{p=30;for(i=0;i<p;i++){console.log(Array(p).join(" ")+"+\n");r=~~(Math.random()*3);p+=r==2?-1:r}}
Oliver

That'll kill the bytes, I'll tell you that. ES5 doesn't include the arrow functions by default. I'll update
Kyle Fairns

@Oliver, function format added :)
Kyle Fairns

Nice! I'm not sure when it was introduced, but I think you can replace join(" ") with join` `
Oliver

@Oliver I'm not sure you could do that in ES5, could you? I thought that was a template literal added in ES6?
Kyle Fairns

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