How many times, are they multiples?

Question

You are given three parameters: start(int), end(int) and list(of int);

Make a function that returns the amount of times all the numbers between start and end are multiples of the elements in the list. example:

start = 15; end = 18; list = [2, 4, 3];
15 => 1 (is multiple of 3)
16 => 2 (is multiple of 2 and 4)
17 => 0
18 => 2 (is multiple of 2 and 3)
result = 5

The function should accept two positive integer numbers and an array of integers as parameters, returning the total integer number. Assume that start is less <= end.

examples:

Multiple(1, 10, [1, 2]); => 15
Multiple(1, 800, [7, 8]); => 214
Multiple(301, 5000,[13, 5]); => 1301

The shortest solution is the victor!!! May he odds be ever in your favor...

Nice challenge! Presumably the winning criterion is shortest code? In which case you should say so explicitly, and add the code-golf tag. — Robin Ryder, Dec 2 '19 at 10:16
You say integers. So start, end or the elements in list may be non-positive? — Seb, Dec 3 '19 at 11:17
I'd like to ask a question (as I'm really new in this channel), how do I decide the winner? since each language has it's own limitations... Or is it simply a personal preference? — Rui Silva, Dec 6 '19 at 8:52

Community · Accepted Answer · 2020-06-17 09:04:33Z

11

05AB1E, 5 bytes

ŸÑ˜åO

Try it online!

Explanation

Ÿ       - the numbers between start and end 
 Ñ      - get their divisors
  ˜     - deep flatten this list
   å    - find the instances of the elements in the list in these divisors
    O   - Sum this

edited Jun 17 '20 at 9:04

Community♦

1

answered Dec 2 '19 at 11:10

Expired Data

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flawr · Accepted Answer · 2019-12-02 20:28:48Z

10

Haskell, 33 bytes

(a#b)x=sum[1|0<-mod<$>[a..b]<*>x]

Try it online!

Explanation:

(a#b)x                            --take two values a and b and the list x
                      [a..b]      --generate the range a, a+1, ... , b
                mod<$>[a..b]      --partially apply "mod" to each entry of the list
                mod<$>[a..b]<*>x  --apply the partially applied functions to all values of the list x
          [1|0<-mod<$>[a..b]<*>x] --generate a new list with a one for every zero in the previously computed list
(a#b)x=sum[1|0<-mod<$>[a..b]<*>x] --sum it all up

edited Dec 2 '19 at 20:28

answered Dec 2 '19 at 11:04

flawr

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\$\begingroup\$ Nice method. I found a variant that ties and tried to shorten it point-free but could tie at best -- maybe you have a better idea. \$\endgroup\$ – xnor Dec 3 '19 at 9:58
\$\begingroup\$ @xnor I've also tried to get rid of the x, but without success, the (0^) trick is neat, please consider posting it as an own answer! (So far I have had no success in golfing your suggestions further.) \$\endgroup\$ – flawr Dec 3 '19 at 15:45

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tsh · Accepted Answer · 2019-12-03 09:48:15Z

10

JavaScript (Node.js), 44 bytes

(a,x,y)=>a.map(n=>t+=y/n-(~-x/n|0)|0,t=0)&&t

Try it online!

Python 2, 38 bytes

lambda a,x,y:sum(y/i-~-x/i for i in a)

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\$ \sum _{i \in list} \lfloor \frac{end}{i} \rfloor - \lfloor \frac{start-1}{i} \rfloor \$

The answer seems trivial and naive. So am I misunderstand something?

edited Dec 3 '19 at 9:48

answered Dec 3 '19 at 9:29

tsh

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\$\begingroup\$ Your Python answer is right -- I was going to post the same. Congrats on figuring out the simplification. I'm disappointed nobody else had found the floor-division idea earlier, at least on my quick glance of the answers. \$\endgroup\$ – xnor Dec 3 '19 at 9:50
1

\$\begingroup\$ @xnor the formula comes up with my mind just after I read the question. But since the question is posted ~1d ago (and no one using it), I can't quite believe it could be correct. After posting the JavaScript version, I realized that by using Python I could save many bytes.. \$\endgroup\$ – tsh Dec 3 '19 at 9:55

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Jo King · Accepted Answer · 2019-12-02 11:02:02Z

7

Perl 6, 21 bytes

{sum $^a..$^b X%%@^c}

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Explanation

{                   }   # Anonymous codeblock returning
 sum                    # The sum of
     $^a..$^b           # How many numbers in the range a to b
              X%%       # Are divisible by any of
                 @^c    # The third parameter

edited Dec 2 '19 at 11:02

answered Dec 2 '19 at 10:48

Jo King♦

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Luis Mendo · Accepted Answer · 2019-12-02 15:17:58Z

MATL, 5 bytes

:i\~z

Inputs are a cell array containing the start and end values, and then a column vector defining list.

Try it online! Or verify all test cases.

Explanation

:    % Range, with implicit input: cell array {start, end}. This gives the range
     % from start to end
i    % Input: list of numbers in the form of a column vector
\    % Modulo, with boradcast. This gives a matrix with each number in the range
     % modulo each number in the list
~    % Logical negation 
z    % Number of nonzero entries. Implicit display

Henry T · Accepted Answer · 2019-12-02 11:26:04Z

6

Python 3, 54 bytes

lambda s,e,L:sum(n%l<1for n in range(s,e+1)for l in L)

Try It Online!

edited Dec 2 '19 at 11:26

answered Dec 2 '19 at 10:08

Henry T

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Community · Accepted Answer · 2020-06-17 09:04:33Z

5

APL+WIN, 20 15 bytes

5 bytes saved thanks to Adam.

Prompts for end integer, start integer and then list:

+/,0=⎕∘.|⎕↓0,⍳⎕

Try it online! Courtesy of Dyalog Classic

Could be reduced to 9 bytes if we could enter two lists and not have to generate the first:

+/,0=⎕∘.|⎕

edited Jun 17 '20 at 9:04

Community♦

1

answered Dec 2 '19 at 10:46

Graham

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\$\begingroup\$ +/+/ → +/, \$\endgroup\$ – Adám Dec 2 '19 at 11:50
\$\begingroup\$ s+⍳1+⎕-s←⎕ → ⎕↓0,⍳⎕ \$\endgroup\$ – Adám Dec 2 '19 at 11:53

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Robin Ryder · Accepted Answer · 2019-12-05 18:10:28Z

5

R, 35 bytes

function(a,b,l)sum(b%/%l-(a-1)%/%l)

Try it online!

Implementation of tsh's method by Giuseppe. 3 bytes shorter than the previous version:

R, 45 38 bytes

-7 bytes thanks to Nick Kennedy and Xi'an.

function(a,b,l)sum(!outer(a:b,l,`%%`))

Try it online!

Boils down to summing the values of !(x %% y) for x in a:b and y in l (%% is \$mod\$ in R, so x %% y == 0 iff x is a multiple of y).

edited Dec 5 '19 at 18:10

answered Dec 2 '19 at 10:10

Robin Ryder

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\$\begingroup\$ Though it removes your first use of Negate, tio.run/##K/… is shorter. \$\endgroup\$ – Nick Kennedy Dec 2 '19 at 11:08
\$\begingroup\$ @NickKennedy Yes, of course, thanks! Xian just told me as much… Don't know why I didn't think of it! I guess I was too eager to use Negate. \$\endgroup\$ – Robin Ryder Dec 2 '19 at 12:11
\$\begingroup\$ 35 using tsh's method. \$\endgroup\$ – Giuseppe Dec 3 '19 at 21:08

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Noodle9 · Accepted Answer · 2019-12-08 16:04:41Z

5

C++ (clang), 113 110 109 108 106 100 93 99 91 89 bytes

using I=int;I s;void f(I a,I b,I*l,I z,I&s){for(s=0;a<=b;++a)for(I i=z;i--;)s+=a%l[i]<1;}

Try it online!

Saved 3 bytes thanks to @AZTECCO!!!
Saved 6 13 bytes thanks to @bznein!!!
~~Added 6~~ Saved 8 bytes thanks to @AZTECCO (and now it's playing by the rules)!!!

edited Dec 8 '19 at 16:04

answered Dec 2 '19 at 15:12

Noodle9

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\$\begingroup\$ You can use #import<vector> to save 1 \$\endgroup\$ – AZTECCO Dec 2 '19 at 15:23
\$\begingroup\$ @AZTECCO Thanks, didn't know about #import. :-) \$\endgroup\$ – Noodle9 Dec 2 '19 at 17:42
\$\begingroup\$ #include is standard.. See stackoverflow.com/a/172264/7699953 btw you can save 2 by using s+=a%i<1; instead of s+=a%i?0:1; \$\endgroup\$ – AZTECCO Dec 2 '19 at 20:58
\$\begingroup\$ @AZTECCO Ah, good to see Microsoft doing something useful for the code-golfing community. Thanks for the -2! :-) \$\endgroup\$ – Noodle9 Dec 2 '19 at 21:12
1

\$\begingroup\$ @AZTECCO So many ints! Managed to save 2 bytes using using. :-) \$\endgroup\$ – Noodle9 Dec 8 '19 at 16:09

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G B · Accepted Answer · 2019-12-02 10:44:50Z

4

Ruby, 41 bytes

->a,e,l{l.sum{|x|(a..e).count{|r|r%x<1}}}

Try it online!

answered Dec 2 '19 at 10:44

G B

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Community · Accepted Answer · 2020-06-17 09:04:33Z

4

JavaScript (ES6), 47 bytes

Takes input as (list, start)(end).

(a,x,s=0)=>g=y=>y<x?s:g(y-1,a.map(c=>y%c||s++))

Try it online!

edited Jun 17 '20 at 9:04

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1

answered Dec 2 '19 at 11:09

Arnauld

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Galen Ivanov · Accepted Answer · 2019-12-03 09:06:43Z

K (oK), 16 bytes

{+//~z!\:x_!1+y}

Try it online!

Explanation:

{+//~z!\:x_!1+y} - function with 3 arguments [x;y;z] <- (start; end; list)
           !1+y  - a list 0 to end (inclusive)
         x_      - drop the first start numbers
     z!\:        - find the modulo of each number in the range start..end with each of list
    ~            - negate (0 becomes 1, non-zero becomes 0)
 +//             - reduce by addition and converge (repeat until result stops changing)

J, 22 bytes

1#.1#.0=[|/(}.i.,])/@]

Try it online!

Explanation:

The verbs (functions) in J can take one (right) or two (left and right) arguments. The left argument is the list, the right one - a list of the start and end numbers.

           (       )/@     insert the verb in () between the elements of
                      ]    the right argument (start and end)
                 ,         append
               i.          a list 0..end-1
                  ]        to the right argument (end)
             }.            drop start elements
          |/               insert modulo verb between the above list and 
         [                 the left argument (the list)
       0=                  compare each with 0
    1#.                    sum by base 1 conversion 
 1#.                       sum by base 1 conversion 
                           (we do it twice, because the result of |/ is a table)

@AZTECCO I added an explanation of the K answer. I'm going to add the J one soon. — Galen Ivanov, Dec 3 '19 at 8:03

Adám · Accepted Answer · 2019-12-02 11:58:41Z

3

APL (Dyalog Extended), 9 bytes^SBCS

Full program, prompting for end, start, list, from stdin.

≢⍸=⎕|\⎕…⎕

Try it online!

⎕ prompt for end

⎕… prompt for start and generate progression vector

⎕|\ prompt for **list* and make division remainder table

= Boolean mask indicating where equal to zero

⍸ get the indices of the Trues

≢ tally them

answered Dec 2 '19 at 11:58

Adám

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Jitse · Accepted Answer · 2019-12-02 14:22:39Z

3

Python 2, 54 bytes

f=lambda n,m,l:m/n and sum(n%i<1for i in l)+f(n+1,m,l)

Try it online!

edited Dec 2 '19 at 14:22

answered Dec 2 '19 at 10:05

Jitse

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\$\begingroup\$ Cool trick using the recursion and division! \$\endgroup\$ – justhalf Dec 3 '19 at 7:51

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Nahuel Fouilleul · Accepted Answer · 2019-12-02 14:55:49Z

3

Bash, 40 bytes

eval set !\$[{$1..$2}%{$3}]+;echo $[$*0]

Try it online!

edited Dec 2 '19 at 14:55

answered Dec 2 '19 at 14:18

Nahuel Fouilleul

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Community · Accepted Answer · 2020-06-17 09:04:33Z

3

APL(NARS), chars 13, bytes 26

{+/∊0=⍺∣../⍵}

⍺ it is the list of divisors, ⍵ it is the range. Test:

  1 2{+/∊0=⍺∣../⍵}1 10
15
  7 8{+/∊0=⍺∣../⍵}1 800
214
  13 5{+/∊0=⍺∣../⍵}301 5000
1301
  13 5 3 11{+/∊0=⍺∣../⍵}301 5000
3294

edited Jun 17 '20 at 9:04

Community♦

1

answered Dec 3 '19 at 18:26

user58988

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Nick Kennedy · Accepted Answer · 2019-12-02 11:06:37Z

2

Jelly, 7 bytes

r/ḍ@€FS

Try it online!

A dyadic link taking a list of [start, end] as the left argument and the list of possible divisors as the right argument. Returns an integer indicating the total number of possible divisions.

answered Dec 2 '19 at 11:06

Nick Kennedy

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1

\$\begingroup\$ Nice answer! My version was also a 7 byter (tryadic link). \$\endgroup\$ – Mr. Xcoder Dec 2 '19 at 18:11

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Lyxal · Accepted Answer · 2019-12-02 23:28:35Z

2

Java (JDK), 115 67 bytes

(s,e,d)->{int t=0;for(;s<=e;s++)for(int j:d)t+=s%j<1?1:0;return t;}

48 bytes saved thanks to Olivier

Try it online!

First time golfing in Java, so this is a new experience for me.

edited Dec 2 '19 at 23:28

answered Dec 2 '19 at 21:29

Lyxal

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1

\$\begingroup\$ Well, you can declare lambda methods: (s,e,d)->{...}. Also, you can remove spaces and probably use a few golfing tips. Here's my take on golfing your answer. \$\endgroup\$ – Olivier Grégoire Dec 2 '19 at 22:30

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Galen Ivanov · Accepted Answer · 2019-12-02 19:13:04Z

1

Icon, 59 bytes

procedure f(a,b,l)
n:=0
(a to b)%!l<1&n+:=1&\z
return n
end

Try it online!

edited Dec 2 '19 at 19:13

answered Dec 2 '19 at 11:46

Galen Ivanov

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caird coinheringaahing · Accepted Answer · 2019-12-02 20:30:14Z

1

Python 54 bytes

lambda K,M,H:sum(n%l<1for n in range(K,M+1)for l in H)

edited Dec 2 '19 at 20:30

caird coinheringaahing

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answered Dec 2 '19 at 20:24

JulianMota

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\$\begingroup\$ Welcome to the site! I've edited your answer to fit the standard format, feel free to edit in any explanations, or links to online testing environments such as Try it online! \$\endgroup\$ – caird coinheringaahing Dec 2 '19 at 20:31

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Community · Accepted Answer · 2020-06-17 09:04:33Z

Japt `-x`, 7 6 bytes

rõ ïvV

Try it

rõ ïvV     :Implicit input of arrays U=[start,end] and V=list
           > e.g., U=[15,18] V=[2,4,3]
r          :Reduce U by
 õ         :  Inclusive range
           > [15,16,17,18]
   ï V     :Cartesian product with V
           > [[15,2],[15,4],[15,3],[16,2],[16,4],[16,3],[17,2],[17,4],[17,3],[18,2],[18,4],[18,3]]
    v      :Reduce each pair by testing the divisibility of the first by the second
           > [0,0,1,1,1,0,0,0,0,1,0,1]
           :Implicit output of sum of resulting array
           > 5

JohnWells · Accepted Answer · 2019-12-07 02:50:09Z

1

Kotlin, 69 bytes

{s:Int,e:Int,l:List<Int>->(s..e).toList().sumBy{v->l.count{v%it==0}}}

Try it online!

answered Dec 7 '19 at 2:50

JohnWells

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LegionMammal978 · Accepted Answer · 2020-10-24 23:01:14Z

1

Husk, 6 bytes

#0×`%…

Try it online! Nothing very special.

answered Oct 24 '20 at 23:01

LegionMammal978

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Neil · Accepted Answer · 2019-12-02 11:00:12Z

Charcoal, 11 bytes

Ｉ⁻Σ÷ηζΣ÷⊖θζ

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

    η       Second input (End)
     ζ      Third input (List)
   ÷        Vectorised integer division
  Σ         Sum
         θ  First input (Start)
        ⊖   Decremented
          ζ Third input (List)
       ÷    Vectorised integer division
      Σ     Sum
 ⁻          Subtract
Ｉ           Cast to string
            Implicitly print

ar4093 · Accepted Answer · 2019-12-02 12:20:40Z

Pyth, 15 bytes

/.nm%LdeQ}.*PQ0

Try it online!

Takes input as start, end, list

Explanation:

         }        # Inclusive range
          .*      # Splat (list becomes list of arguments)
            PQ    # All but the last element of the input
                  # --> inclusive range from start to end
   m              # map each number of that
     L eQ         # to a map of each member of Q[-1] = list
    % d           # remainder modulo member (2, 4, 3 in example)
                  # --> List of lists of remainders
 .n               # flatten
/              0  # count zeroes

\$\begingroup\$ -5 bytes using multiple inputs and pfns \$\endgroup\$ – frank Dec 4 '19 at 23:12 — frank, Dec 4 '19 at 23:12

Nahuel Fouilleul · Accepted Answer · 2019-12-02 13:57:52Z

0

Perl 5 (`-ap`), 33 bytes

for$i(<>..<>){$i%$_||$\++for@F}}{

Try it online!

answered Dec 2 '19 at 13:57

Nahuel Fouilleul

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Marix · Accepted Answer · 2019-12-02 14:27:52Z

0

C# (Visual C# Interactive Compiler), 54 bytes

(a,b,l)=>l.Where(x=>a%x<1).Count()+(++a>b?0:f(a,b,l));

Try it online!

Recursive approach

answered Dec 2 '19 at 14:27

Marix

313 bronze badges

1

\$\begingroup\$ It's recursive, but you don't define f. You should define it like this: f=(a,b,l)=>... \$\endgroup\$ – Olivier Grégoire Dec 2 '19 at 22:39
\$\begingroup\$ @OlivierGrégoire If it is recursive, you have to include the whole function definition: Func<int,int,IEnumerable<int>,int>f=(a,b,l)=>..., since f=(a,b,l)=>... is not a valid expression (f does not exist yet). However, it would just be shorter to do int f(int a,int b,IEnumerable<int>l)=>... \$\endgroup\$ – Gymhgy Dec 3 '19 at 4:12
1

\$\begingroup\$ if you take in int[] instead of IEnumerable<int> you can use Length instead of Count(), removing 1 byte \$\endgroup\$ – Ivan García Topete Dec 3 '19 at 18:15

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Community · Accepted Answer · 2020-06-17 09:04:33Z

SimpleTemplate, 86 bytes

Yeah, kinda long, but it works!
Receives 2 numbers (in any order) and an array/string of 1-digit numbers (e.g.: "243"), passed to the render() method of the compiler.

{@fori fromargv.0 toargv.1}{@eachargv.2}{@ifi is multiple_}{@incR}{@/}{@/}{@/}{@echoR}

Displays the result or nothing, if none is

Ungolfed

{@set count 0}
{@for i from argv.0 to argv.1}
    {@each argv.2 as number}
        {@if i is multiple of number}
            {@inc by 1 count}
        {@/}
    {@/}
{@/}
{@echo count}

Should be mostly straightforward.

You can try it on http://sandbox.onlinephpfunctions.com/code/b26cd7f75e0c4676038573c4274180891a890895

Change line 986 to test the golfed and ungolfed versions, and line 988 to get the input.

Ian Johnson · Accepted Answer · 2019-12-03 21:08:36Z

0

Mathematica, 52 bytes

f[s_,e_,l_]:=(q=Quotient;Total[q[e,#]-q[s-1,#]&/@l])

This uses the simplification formula from @tsh

A less clever solution at 66 bytes but more directly following the OP:

f[s_,e_,l_]:=Total[Length@Intersection[Divisors@#,l]&/@Range[s,e]]

answered Dec 3 '19 at 21:08

Ian Johnson

415 bronze badges

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Taylor Scott · Accepted Answer · 2020-10-26 18:20:57Z

0

Excel VBA, 77 Bytes

Immediate window function that takes start from [A1], end from [B1], and list from column C ([C:C]). Output is directed to the immediate window.

[C:C].SpecialCells(2) is used to iterate j over only the cells in Column C which contain a value, as non-valued cells produce an error.

For i=[A1]To[B1]:For Each j In[C:C].SpecialCells(2):s=s-(i/j=i\j):Next j,i:?s

answered Oct 26 '20 at 18:20

Taylor Scott

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How many times, are they multiples?

30 Answers 30

05AB1E, 5 bytes

Explanation

Haskell, 33 bytes

JavaScript (Node.js), 44 bytes

Python 2, 38 bytes

Perl 6, 21 bytes

Explanation

MATL, 5 bytes

Explanation

Python 3, 54 bytes

APL+WIN, 20 15 bytes

R, 35 bytes

R, 45 38 bytes

C++ (clang), 113 110 109 108 106 100 93 99 91 89 bytes

Ruby, 41 bytes

JavaScript (ES6), 47 bytes

K (oK), 16 bytes

Explanation:

J, 22 bytes

Explanation:

APL (Dyalog Extended), 9 bytesSBCS

Python 2, 54 bytes

Bash, 40 bytes

APL(NARS), chars 13, bytes 26

Jelly, 7 bytes

Java (JDK), 115 67 bytes

Icon, 59 bytes

Python 54 bytes

Japt -x, 7 6 bytes

Kotlin, 69 bytes

Husk, 6 bytes

Charcoal, 11 bytes

Pyth, 15 bytes

Perl 5 (-ap), 33 bytes

C# (Visual C# Interactive Compiler), 54 bytes

SimpleTemplate, 86 bytes

Mathematica, 52 bytes

Excel VBA, 77 Bytes

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