Рандомізуйте скаляри масиву


14

Ви повинні заповнити масив кожним числом 0-nвключно. Жодне число не повинно повторюватися. Однак вони повинні бути у випадковому порядку.

Правила

Усі стандартні правила та стандартні лазівки заборонені

Масив повинен бути згенерований псевдовипадково. Кожна можлива перестановка повинна мати рівну ймовірність.

Вхідні дані

n будь-яким способом, дозволеним у публікації вводу-виводу на мета.

Вихідні дані

Масив чисел скремблірований з 0-nвключно.


вихід можна розділити новими рядками?
DrnglVrgs

@Riley opps, який мав бути пошкодженим.
Крістофер

@DrnglVrgs так може
Крістофер

Під "числами" я припускаю, що ви маєте на увазі "цілі числа"?
Zacharý

1
@KevinCruijssen IMO списки = масив, але з підтримкою пошуку. Тож обов'язково скористайтеся списком
Крістофер

Відповіді:




8

Pyth, 3 байти

.Sh

Демонстрація

.Sє перетасуванням. Він неявно кидає вхідне ціле число nдо діапазону [0, 1, ..., n-1]. hє +1, і введення приймається неявно.




5

Python 2 , 51 байт

lambda n:sample(range(n+1),n+1)
from random import*

Спробуйте в Інтернеті!

Є, random.shuffle()але він змінює аргумент на місці, а не повертати його ...


Ви можете використовуватиrandom.shuffle
caird coinheringaahing

@cairdcoinheringaahing Так, але це не працює. Наприклад, lambda n:shuffle(range(n+1))не записуватимуть результат ніде.
повністюлюдський






3

Japt, 4 bytes

ò öx

Try it online


    :Implicit input of integer U
ò   :Generate array of 0 to U.
öx  :Generate random permutation of array.
    :Implicit output of result.

Gosh darn it, I thought öx would be enough until I noticed the "inclusive" part. (You could replace the x with almost anything else, btw)
ETHproductions

@ETHproductions, that was my first thought too.
Shaggy

3

C#, 76 bytes

using System.Linq;i=>new int[i+1].Select(x=>i--).OrderBy(x=>Guid.NewGuid());

This returns an IOrderedEnumerable, I hope that's okay, or else I need a few more bytes for a .ToArray()



3

Java 8, 114 111 97 bytes

import java.util.*;n->{List l=new Stack();for(;n>=0;l.add(n--));Collections.shuffle(l);return l;}

-3 bytes and bug-fixed thanks to @OlivierGrégoire.
-4 bytes thanks to @Jakob.
-10 bytes by removing .toArray().

Explanation:

Try it here.

import java.util.*;        // Required import for List, Stack and Collections
n->{                       // Method with integer parameter and Object-array return-type
  List l=new Stack();      //  Initialize a List
  for(;n>=0;l.add(n--));   //  Loop to fill the list with 0 through `n`
  Collections.shuffle(l);  //  Randomly shuffle the List
  return l;                //  Convert the List to an Object-array and return it
}                          // End of method

1
Bug: doesn't include n. Fix and golf: for(n++;--n>=0;l.add(n));. Also, I say you don't need to return an array. Array and list are the same in most language, so just return the list.
Olivier Grégoire

@OlivierGrégoire Woops.. That's what you get for not checking properly and just posting.. Thanks for the bug-fix (and 4 bytes saved in the process).
Kevin Cruijssen

1
Well, three actually, because I edited again, having myself introduced another bug: > should be >=.
Olivier Grégoire

1
-4 bytes: use a Stack instead of a Vector and change your loop to for(;n>=0;l.add(n--));. And returning a java.util.List is definitely fine.
Jakob


2

Pyth, 4 Bytes

.S}0

Try it here!


You can golf to 3 bytes. .S with an integer argument is the same as .SU, and [0..n] can be coded as Uh, so you can use .SUh, which then becomes .Sh.
Erik the Outgolfer

@EriktheOutgolfer thanks for the hint, but as someone has alread posted the solution you propose I will leave this as this.
KarlKastor

Well, it's borderline whether that should've been a separate answer or not, but I believe it counts as a dupe, so even it being allowed, I'd consider it just builtin substitution, so nah, I didn't want to post separate, but isaacg did.
Erik the Outgolfer

2

C, 75 bytes

a[99],z,y;f(n){if(n){a[n]=--n;f(n);z=a[n];a[n]=a[y=rand()%(n+1)];a[y]=z;}}

Recursive function that initializes from the array's end on the way in, and swaps with a random element before it on the way out.


What if n > 98?
LegionMammal978

It would fail, of course, but input range wasn't specified in the problem. Please don't make me malloc :)
Computronium

change a into a para to fit the rule more?
l4m2


2

Charcoal, 33 bytes

A…·⁰NβFβ«AβδA‽δθPIθ↓A⟦⟧βFδ¿⁻θκ⊞βκ

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

Apparently it takes 17 bytes to remove an element from a list in Charcoal.

Edit: These days it only takes three bytes, assuming you want to remove all occurrences of the item from the list. This plus other Charcoal changes cut the answer down to 21 bytes: Try it online!


Yikes that is a lot
Christopher

2

APL (Dyalog), 5 bytes

?⍨1+⊢

Try it online!

Assumes ⎕IO←0, which is default on many machines.

Explanation

the right argument

1+ add 1 to it

?⍨ generate numbers 0 .. 1+⊢-1 and randomly deal them in an array so that no two numbers repeat


2

q/kdb+, 11 bytes

Solution:

{(0-x)?1+x}

Example:

q){(0-x)?1+x}10
5 9 7 1 2 4 8 0 3 10
q){(0-x)?1+x}10
6 10 2 8 4 5 9 0 7 3
q){(0-x)?1+x}10
9 6 4 1 10 8 2 7 0 5

Explanation:

Use the ? operator with a negative input to give the full list of 0->n without duplicates:

{(0-x)?1+x} / solution
{         } / lambda expression
         x  / implicit input
       1+   / add one
      ?     / rand
 (0-x)      / negate x, 'dont put item back in the bag'

2

TI-83 BASIC, 5 bytes (boring)

randIntNoRep(0,Ans

Yep, a builtin. randIntNoRep( is a two-byte token, and Ans is one byte.

More fun, 34 bytes:

Ans→N
seq(X,X,0,N→L₁
rand(N+1→L₂
SortA(L₂,L₁
L₁

Straight from tibasicdev. Probably golfable, but I haven't found anything yet.

What this does: Sorts a random array, moving elements of the second arg (L₁ here) in the same way as their corresponding elements.


1

JavaScript (ES6), 51 bytes

n=>[...Array(n+1).keys()].sort(_=>.5-Math.random())

2
I don't think this is uniform; I've tried f(5) 10 times and 5 has been one of the last two items every time.
ETHproductions

Just ran it again a couple of times myself and got 1,5,4,0,2,3 & 1,0,2,5,3,4. EDIT: And a few more prnt.sc/fe0goe
Shaggy

3
Just ran a quick test which runs f(5) 1e5 times and finds the average position of each number in the results. The resulting array was [ 1.42791, 1.43701, 2.00557, 2.6979, 3.3993, 4.03231 ], so I don't think it's uniform. (code)
ETHproductions

I think I have a 93 byte solution that could work. n=>(a=[...Array(n).keys(),n++]).reduce((a,v,i)=>([a[i],a[j]]=[a[j=n*Math.random()|0],v],a),a)?
kamoroso94

Sorting on the result of random() isn't uniform. See (for example) en.wikipedia.org/wiki/BrowserChoice.eu#Criticism
Neil

1

Aceto, 15 14 16 bytes

@lXp
Y!`n
zi&
0r

Push zero on the stack, read an integer, construct a range and shuffle it:

Y
zi
0r

Set a catch mark, test length for 0, and (in that case) exit:

@lX
 !`

Else print the value, a newline, and jump back to the length test:

   p
   n
  &

(I had to change the code because I realized I misread the question and had constructed a range from 1-n, not 0-n.)




1

8th, 42 36 34 bytes

Code

>r [] ' a:push 0 r> loop a:shuffle

SED (Stack Effect Diagram) is n -- a

Usage and example

ok> 5 >r [] ' a:push 0 r> loop a:shuffle .
[2,5,0,3,1,4]

1

Javascript (ES6), 68 bytes

n=>[...Array(n+1)].map((n,i)=>[Math.random(),i]).sort().map(n=>n[1])

Creates an array of form

[[Math.random(), 0],
 [Math.random(), 1],
 [Math.random(), 2],...]

Then sorts it and returns the last elements in the new order


1

J, 11 Bytes

(?@!A.i.)>:

Explanation:

         >:   | Increment
(?@!A.i.)     | Fork, (f g h) n is evaluated as (f n) g (h n)
      i.      | Integers in range [0,n) inclusive
 ?@!          | Random integer in the range [0, n!)
    A.        | Permute right argument according to left

Examples:

    0 A. i.>:5
0 1 2 3 4 5
    1 A. i.>:5
0 1 2 3 5 4
    (?@!A.i.)>: 5
2 3 5 1 0 4
    (?@!A.i.)>: 5
0 3 5 1 2 4

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