Fibonacci Biner

31

Tantangan

Anda perlu membuat program atau fungsi yang mengambil dalam bilangan bulat positif N, menghitung persyaratan N pertama dari urutan Fibonacci dalam biner, menggabungkannya menjadi angka biner tunggal, mengonversi angka itu kembali ke desimal, dan kemudian mengeluarkan desimal sebagai sebuah bilangan bulat.

Sebagai contoh

1 -> [0] -> 0 to decimal outputs 0
3 -> [0, 1, 1] -> 011 to decimal outputs 3
4 -> [0, 1, 1, 10] -> 01110 to decimal outputs 14

Anda tidak perlu menampilkan ->, hanya nomornya (mis. Jika pengguna mengetik4 , cukup keluaran 14). Panah hanya untuk membantu menjelaskan apa yang harus dilakukan program.

Uji kasus

1 -> 0
2 -> 1
3 -> 3
4 -> 14
5 -> 59
6 -> 477
7 -> 7640
8 -> 122253
9 -> 3912117
10 -> 250375522
11 -> 16024033463
12 -> 2051076283353
13 -> 525075528538512
14 -> 134419335305859305
15 -> 68822699676599964537
16 -> 70474444468838363686498
17 -> 72165831136090484414974939
18 -> 147795622166713312081868676669
19 -> 605370868394857726287334099638808
20 -> 4959198153890674493745840944241119317

Program harus dapat menampilkan hingga batas bahasa yang digunakan. Tidak ada tabel pencarian atau solusi umum diizinkan.

Ini kode-golf , jadi jawabannya dengan jumlah byte terpendek menang!

code-golf binary fibonacci Nathan Wood
sumber
1
Menambahkan test case dari 0 hingga 20 dari tio.run/##DYxBCoQwDAC/… . Kredit ke @alephalpha untuk program ini.
Nathan Wood
6
Karena belum dikatakan: Selamat datang di PPCG! Tantangan pertama yang bagus.
Laikoni
@Laikoni Terima kasih!
Nathan Wood
Di mana tepatnya batas spesifik bahasa berlaku? Apakah fungsi C yang mengembalikan integer 32-bit diizinkan? Seperti int32_t binary_concat_Fib(int n), yang akan membatasi nilai output yang dihasilkan menjadi 2 ^ 31-1. yaitu Anda bisa mengasumsikan semua bit gabungan cocok dalam bilangan bulat. Atau haruskah fungsi bekerja sampai pada titik di mana angka Fibonacci terbesar tidak muat dalam bilangan bulat sendiri, jadi menggabungkan bit membutuhkan presisi yang diperluas?
Peter Cordes
1
Dan apakah "convert to desimal" harus eksplisit, memanggil fungsi integer-> string atau menulis sendiri? Menggabungkan bit menjadi integer tunggal memberi Anda representasi nilai akhir. Jika saya mengerti dengan benar, jawaban Python Dennis adalah mengembalikan integer, menyerahkannya kepada pemanggil untuk mengubah nilai itu menjadi string desimal atau melakukan apa pun dengan itu. Nilai integer dalam bahasa komputer yang mendukung operator bit-shift secara alami biner, bukan desimal, kecuali mereka disimpan dalam string. Dalam bahasa tanpa operator shift / bitwise, tidak ada yang menyiratkan dasar apa pun.
Peter Cordes

Jawaban:

11

Python, 64 bytes

f=lambda n,a=0,b=1,r=0:n and f(n-1,b,a+b,r<<len(bin(a))-2|a)or r

Try it online!

Dennis
sumber
1
Nice, I was just trying to achieve this style.
Jonathan Allan
10

Jelly,  7  6 bytes

ḶÆḞBẎḄ

Try it online!

How?

ḶÆḞBẎḄ - Link: integer, n
Ḷ      - lowered range -> [0,1,2,3,4,5,...,n]
 ÆḞ    - Fibonacci (vectorises) -> [0,1,1,2,3,5...,F(n)]
   B   - to binary (vectorises) -> [[0],[1],[1],[1,0],[1,1],[1,0,1],...,B(F(n))]
    Ẏ  - tighten -> [0,1,1,1,0,1,1,1,0,1,...,B(F(n))[0],B(F(n))[1],...]
     Ḅ - from binary -> answer
Jonathan Allan
sumber
1
Messing around with the new quicks, I found that the first n Fibonacci numbers can also be found using Ṛc’SƲƤ which could be useful for similar sequences.
miles
7

brainfuck, 397 bytes

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

Well, that was fun!

Takes ASCII input (e.g. 11), outputs result in ASCII.

Note: to try this online, make sure you set the cell size to 32 bits (on the right side of the webpage). If you do not enter an input, your browser might crash.

The interpreter cannot handle input of 11 and higher because it only supports up to 32 bits.

Try it on copy.sh

Explanation

>,[<++++++[->--------<]>>[->++++++++++<]>[-<+>]<<[->+<],]>+

Get decimal input and add one (to mitigate off-by-one)

[-<<+>>[-[->+<]<<[->+>+<<]<[->+>+<<]>[-<+>]>>[-<<+>>]>]]

Generate fibonacci numbers on the tape.

<<[->+>>>>>+<<<<<<]>[-<+>]>+>>+>>>+<

Set up for the incoming binary concatenation loop

So the cells contain the value, starting from the first position,

1 | 0 | 1 | 1 | 2 | 3 | 5 | ... | f_n | 0 | 1 | 0 | 1 | 0 | f_n | 1 | 0 | 0 | 0...

Look at these cells:

f_n | 0 | 1 | 0 | 1 | 0 | f_n | 1

I'll label this:

num | sum | cat | 0 | pow | 0 | num | pow

pow is there to find the maximal power of 2 that is strictly greater than num. sum is the concatenation of numbers so far. cat is the power of 2 that I would need to multiply the num in order to concatenate num in front of the sum (so I would be able to simply add).

[[->-[<<]>]>

Loop: Check whether f_n is strictly less than pow.

Truthy:

[[-]<<<<<<<[->>[-<+>>+<]>[-<+>]<<<]<[->+>>>>>+<<<<<<]>[-<+>]>[-<+>]>[->>[-<+<<+>>>]<[->+<]<]>+>[-]>>+>]

Zero out junk. Then, add num * cat to sum. Next, load the next Fibonacci number (= f_(n-1); if it doesn't exist, exit loop) and set cat to cat * pow. Prepare for next loop (zero out more junk, shift scope by one).

Falsey:

<<<<<[[->++>+>++<<<]>[-<+>]<<]

Set pow to 2 * pow, restore num.

]

Repeat until there is no Fibonacci number left.

>[-]<<<[-]<<[-]<<->[>++++++++++<[->-[>+>>]>[+[-<+>]>+>>]<<<<<]>>>]<+[->++++++[-<++++++++>]<.<<<+]

Clean garbage. Take each digit of the resulting number and output each (in ascii).

JungHwan Min
sumber
7

Husk, 7 bytes

ḋṁḋ↑Θİf

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Explanation

ḋṁḋ↑Θİf                              4
     İf    The Fibonacci numbers     [1,1,2,3,5,8..]
    Θ      Prepends 0                [0,1,1,2,3,5..]
   ↑     Take n elements from list   [0,1,1,2]
  ḋ        Convert to binary digits  [[0],[1],[1],[1,0]]
 ṁ       Map function then concat    [0,1,1,1,0]
ḋ        Convert from base 2         14
Fyr
sumber
Welcome to PPCG! :)
DJMcMayhem
5

Japt, 9 bytes

ÆMgX ¤Ã¬Í

Run it

Explanation:

ÆMgX ¤Ã¬Í
Æ     Ã     | Iterate X through the range [0...Input]
 MgX        |   Xth Fibonacci number
     ¤      |   Binary
       ¬    | Join into a string
        Í   | Convert into a base-2 number
Oliver
sumber
1
Bah! Beat me to it!
Shaggy
1
@Shaggy I knew this one was going to be a race against you :P
Oliver
4

Pyth, 22 bytes

JU2VQ=+Js>2J)is.BM<JQ2

Try it here

Explanation

JU2VQ=+Js>2J)is.BM<JQ2
JU2                       Set J = [0, 1].
   VQ       )             <Input> times...
     =+Js>2J              ... add the last 2 elements of J and put that in J.
                  <JQ     Take the first <input> elements...
               .BM        ... convert each to binary...
              s           ... concatenate them...
             i       2    ... and convert back to decimal.

sumber
3

Perl 6, 38 bytes

{:2([~] (0,1,*+*...*)[^$_]>>.base(2))}

Try it online!

nwellnhof
sumber
1
Note that this starts to get noticeably slower with inputs above 200. It takes about 8 seconds to generate the output with an input of 1000. (20 seconds if you include printing it)
Brad Gilbert b2gills
3

JavaScript (Node.js), 70 65 58 57 55 bytes

  • thanks to Shaggy for reducing 2 bytes ('0b+C-0 to '0b'+C)
f=(n,a=C=0,b=1)=>--n?f(n,b,a+b,C+=b.toString(2)):'0b'+C

Try it online!

DanielIndie
sumber
You can ditch the -0 at the end to save another 2 bytes.
Shaggy
2

J, 36 Bytes

3 :'#.;<@#:"0]2}.(,{:+_2&{)^:y _1 1'

Explanation:

3 :'#.;<@#:"0]2}.(,{:+_2&{)^:y _1 1' | Explicit function
                 (,{:+_2&{)^:y _1 1  | Make n fibonacci numbers, with _1 1 leading
              2}.                    | Drop the _1 1
       <@#:"0]                       | Convert each item to binary and box
      ;                              | Unbox and join
    #.                               | Convert back from binary
Bolce Bussiere
sumber
2

x86, 37 22 21 bytes

Changelog

  • -13 by using bsr. Thanks Peter Cordes!

  • -2 by zeroing registers with mul.

  • -1 by using a while loop instead of loop and push/pop ecx (credit Peter Cordes).

Input in edi, output in edx. 

.section .text
.globl main
main:
        mov     $5, %edi            # n = 5

start:
        dec     %edi                # Adjust loop count
        xor     %ebx, %ebx          # b = 0
        mul     %ebx                # a = result = 0
        inc     %ebx                # b = 1

fib:
        add     %ebx, %eax          # a += b
        xchg    %eax, %ebx          # swap a,b
        bsr     %eax, %ecx          # c = (bits of a) - 1
        inc     %ecx                # c += 1
        sal     %cl, %edx           # result >>= c
        add     %eax, %edx          # result += a

        dec     %edi                # n--; do while(n)
        jnz     fib 

        ret

Objdump:

00000005 <start>:
   5:   4f                      dec    %edi
   6:   31 db                   xor    %ebx,%ebx
   8:   f7 e3                   mul    %ebx
   a:   43                      inc    %ebx

0000000b <fib>:
   b:   01 d8                   add    %ebx,%eax
   d:   93                      xchg   %eax,%ebx
   e:   0f bd c8                bsr    %eax,%ecx
  11:   41                      inc    %ecx
  12:   d3 e2                   shl    %cl,%edx
  14:   01 c2                   add    %eax,%edx
  16:   4f                      dec    %edi
  17:   75 f2                   jne    b <fib>
  19:   c3                      ret
qwr
sumber
1
Use lea to shift-and-add in fib2. Also, extracting each bit one at a time is unnecessary. Use bsr %eax, %ecx to find the number of bits in the binary representation, and use a shift by CL / or to merge, like Dennis's Python answer is doing.
Peter Cordes
1
You need cl for shift counts, so take your loop counter in a different reg (like %edi) and use dec %edi / jnz (3 bytes in 32-bit code, 4 bytes in 64-bit). In 32-bit code, that saves 1 byte total from dropping the push/pop ecx. Don't fall into the trap of using loop when it makes the problem harder, not easier. (Your calling convention is already custom, clobbering %ebx, so don't call your function main) You might be able to return in EAX while still taking advantage of 1-byte xchg, no need to be non-standard if you don't need to.
Peter Cordes
1
You can replace the extra inc %ecx of the shift count with an extra left-shift as you add, using lea (%eax, %edx, 2), %edx. Neutral in bytes for 32-bit, saves one for x86-64. But saves an instruction.
Peter Cordes
1
Every time I end up using loop in code golf, I feel dirty. Well not quite, but disappointed that I couldn't find an equally small implementation that avoided that slow instruction; outside of code golf, loop is one of my pet peeves. I wish it was fast on modern CPUs, because it would be very nice for extended-precision loops without partial-flag stalls, but it's not and should be considered only as an obscure size optimization instruction that makes your code slow.
Peter Cordes
1
Anyway, nice job. Other than push/pop/loop -> dec/jnz, I don't see any savings, just the LEA speedup that's neutral in code-size. I'd always wondered if there was ever a real use case for the xor/mul trick to zero three registers (do you ever need that many zeroes?), but using that as part of creating a 1 makes it more sensible.
Peter Cordes
2

Haskell, 89 76 75 bytes

f=0:scanl(+)1f
foldr1(\x y->y+x*2*2^floor(logBase 2.read.show$y)).(`take`f)

Ungolfed version:

import Data.Bits

fib = 0:scanl (+) 1 fib

catInt :: Integer -> Integer -> Integer
catInt x y = x' + y where
    position = floor $ succ $ logBase 2 $ realToFrac y
    x' = shift x position

answer :: Integer -> Integer
answer n = foldr1 catInt fib' where
    fib' = take n fib
user9549915
sumber
1
Welcome to PPCG and Haskell golfing in particular! A shorter way to generate an infinite list of Fibonacci numbers is f=0:scanl(+)1f (taken from here). Functions can be anonymous, so you can drop the leading g=, see our Guide to Ggolfing Rules in Haskell.
Laikoni
Thanks! That compensates for some of the longer functions used. I spent a while trying to find a way to implement bit-shifting in a more concise way, but came up short.
user9549915
You can replace $realToFrac y with .read.show$y for one byte
H.PWiz
1

APL+WIN, 55 bytes

Prompts for screen input of integer.

v←b←0 1⋄⍎∊(⎕-2)⍴⊂'v←v,c←+/¯2↑v⋄b←b,((1+⌊2⍟c)⍴2)⊤c⋄'⋄2⊥b

APL+WIN's maximum integer precision is 17 and integer limit is of the order of 10E300 therefore the maximum input number is 55 and the result is: 1.2492739026634838E300

Graham
sumber
1

Python 3, 94 bytes

f=lambda n,a=[0,1]:n>len(a)and f(n,a+[sum(a[-2:])])or int(''.join(bin(v)[2:]for v in a[:n]),2)

Try it online!

Jonathan Allan
sumber
1

Jelly, 6 bytes

ḶÆḞBFḄ

Try it online!

Ḷowered range -> nth ÆḞibonacci number -> from dec to Binary -> Flatten -> from Ḅinary to dec

chromaticiT
sumber
Didn't understand this language but I thought the output is not always correct. e.g. Input 10 and you will get an 16024033463, it is incorrect (correct answer is 250375522).
Guoyang Qin
@AbrahamChin Input 10 returns 250375522
Dennis
Equivalent, duplicate answer, just a heads up
caird coinheringaahing
1

MATL, 21 bytes

0li:"yy+]xx&h"@B]&hXB

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Explanation

0l        % Push 0, then 1 (initial terms of the Fibonacci sequence)
i:"       % Do n times, where n is the input
  yy+     %   Duplicate top two numbers and push their sum
  ]       % End
xx        % Delete the last two results. The stack now contains the
          % first n Fibonacci numbers, starting at 0
&h        % Concatenate all numbers into a row vector
"         % For each
  @       %   Push current number
  B       %   Convert to binary. Gives a vector of 0 and 1
]         % End
&h        % Concatenate all vectors into a row vector
XB        % Convert from binary to decimal. Implicitly display
Luis Mendo
sumber
1

J, 25 bytes

2(#.;)<@#:@(1#.<:!|.)\@i.

Try it online!

Explanation

2(#.;)<@#:@(1#.<:!|.)\@i.  Input: n
                       i.  Range [0, n)
                     \@    For each prefix
                  |.         Reverse
                 !           Binomial coefficient (vectorized)
               <:            Decrement
            1#.              Sum
        #:                   Convert to binary
      <                      Box
    ;                        Link. Join the contents in each box
2 #.                         Convert to decimal from base 2
miles
sumber
1

Python 3, 86 bytes

def f(N):
 a,b,l=0,1,''
 for _ in range(N):l+=format(a,'b');a,b=b,a+b
 return int(l,2)

Try it online!

Guoyang Qin
sumber
1

Add++, 113 bytes

D,f,@@@@*,V$2D+G1+dAppp=0$Qp{f}p
D,k,@,¿1=,1,bM¿
D,g,@,¿1_,1_001${f},1¿{k}
D,w,@,BBbR
D,l,@,ßR€gp€w@0b]@¦+VcG2$Bb

Try it online!

caird coinheringaahing
sumber
1

PHP, 124 Bytes

Try it online!

So I was looking for a way to output fibonacci numbers using the series, until I found this. It turns out you can calculate the fibonacci series via rounding, so I tried the challenge with a recursive function.

I found the approach of "rounding" really interesting, also a professor showed me this a while ago.

Code

function f($n,$i=0,$b=''){ if($n>$i){$b.=
decbin(round(pow((sqrt(5)+1)/2,$i)/sqrt(5)));f($n,$i+1,$b);}else{echo bindec($b);}}

Explanation

function f($n,$i=0,$b=''){           #the function starts with $i=0, our nth-fib number
if($n>$i){                           #it stops once $n (the input) = the nth-fib
    $b.=decbin(                      #decbin returns an integer as bin, concatenates
        round(pow((sqrt(5)+1)/2,$i)/sqrt(5))    
                                       #the formula, basically roundign the expression
        );                           #it returns the (in this case) $i-th fib-number   
    f($n,$i+1,$b);                   #function is called again for the next index
}else{                               #and the current string for fibonacci

    echo bindec($b);                 #"echo" the result, bindec returns the base 10
                                     #value of a base 2 number
}
}

Also check this stackoverflow post the best answer refers to the same article on Wikipedia.

Francisco Hahn
sumber
Interesting way to do it!
Nathan Wood
1

Stax, 9 bytes

ü1∞╓♪εw≤+

Run and debug it at staxlang.xyz!

Unpacked (10 bytes) and explanation:

vr{|5|Bm|B
v             Decrement integer from input. Stax's Fibonacci sequence starts with 1 :(
 r            Integer range [0..n).
  {    m      Map a block over each value in an array.
   |5           Push nth Fibonacci number.
     |B         Convert to binary.
        |B    Implicit concatenate. Convert from binary. Implicit print.
Khuldraeseth na'Barya
sumber
1

Pyth, 27 bytes

JU2V-Q2=aJ+eJ@J_2)is.BM<JQ2

Test suite

Python 3 translation: 
Q=eval(input())
J=list(range(2))
for i in range(Q-2):
    J.append(J[-1]+J[-2])
print(int(''.join(map("{0:b}".format,J[:Q])),2))

37 bytes

J[Z1)W<lJQ=aJ+eJ@J_2)Ig1QZ.?ijkm.BdJ2

Test suite

Python 3 translation: 
Q=eval(input())
J=[0,1]
while len(J)<Q:
    J.append(J[-1]+J[-2])
if 1>=Q:
    print(0)
else:
    print(int(''.join(map("{0:b}".format,J)),2))

hakr14
sumber
0

Ruby, 61 bytes

->n,a=0,b=1,s=""{s+="%b"%a;a,b=b,a+b;(n-=1)>0?redo:s.to_i(2)}

Try it online!

Reinstate Monica iamnotmaynard
sumber
0

Jotlin, 59 bytes

g(l(0,1)){l(a.sum(),a[0])}.take(this).j(""){a[0].s(2)}.i(2)

Test Program

data class Test(val input: Int, val output: Long)

val tests = listOf(
    Test(1, 0),
    Test(2, 1),
    Test(3, 3),
    Test(4, 14),
    Test(5, 59),
    Test(6, 477),
    Test(7, 7640),
    Test(8, 122253),
    Test(9, 3912117),
    Test(10, 250375522)
)
fun Int.r() = g(l(0,1)){l(a.sum(),a[0])}.take(this).j(""){a[0].s(2)}.i(2)

fun main(args: Array<String>) {
    for (r in tests) {
        println("${r.input.r()} vs ${r.output}")
    }
}

It supports up to 10, changing .i(2) for .toLong(2) would support up to 14 if needed

jrtapsell
sumber
0

Python 2, 88 bytes

def f(n):
 a,b,r=0,1,"0"
 for _ in range(n-1):a,b=b,a+b;r+=bin(a)[2:]
 print int(r,2)
sonrad10
sumber
0

R, 244 180 179 bytes

i=ifelse;g=function(n)i(n<3,1,g(n-1)+g(n-2))
a=scan(,"");i(a==1,0,sum(2^(which(rev(unlist(sapply(g(2:a-1),function(x)(y=rev(as.numeric(intToBits(x))))[which(!!y)[1]:32]))>0))-1)))

Try it online!

Saved some bytes by concatenating numeric vectors, not strings. Bloody special case for 0!

Andreï Kostyrka
sumber
Functions are acceptable. Also it is much more efficient to shift the result left by the number of bits then to bother with numeric vectors. See my or Dennis's python answer. This has the added benefit of handling the 0 case.
qwr
codegolf.stackexchange.com/questions/4024/tips-for-golfing-in-r R golfing is too much for me :/
qwr
@qwr The answer is not a function; I am creating a helper function because it must be sapply’d to a vector due to the fact that it is recursive. It cannot be all wrapped into one line. As you see, the programme prompts for user’s input and then returns the answer. One byte can be saved by creating a shortcut for ifelse. And... we can remove ,"" from scan, yes.
Andreï Kostyrka