Will Jimmy fall off his platform?

Question

Backstory

Meet my friend Jimmy:

/o\

Jimmy is a little character who likes to stand on platforms. Here's Jimmy safely standing on a platform:

         /o\
  -------------

Now, Jimmy has a good sense of balance, so he can safely stand with one leg off of the platform, like so:

   /o\
    -------------------

Although if he stands with two or more body parts off of the platform, he will fall. Both of these are examples where Jimmy will fall:

/o\                                       /o\
  ----------        ----------------------   

The challenge

Your challenge is to write a program to determine, given a string with Jimmy's platform and position, if Jimmy can stand on the platform without falling off.

• Input: Two lines showing Jimmy's position and the position of the platform under him. This can be from two separate inputs, a single input, or an array of some sort.

  1. You may take input through any reasonable form, includings functions and standard input. Only resort to hard-coding if your language does not support the other input methods.

• Output: The boolean values true and false, or the integers 1 or 0 to represent true/false respectively.

  1. The boolean value is based off of whether Jimmy can stay on the platform or not - true if Jimmy can stay on the platform, or false if he will fall off.

• The platform size is arbitrary and can be changed at will. Your program should account for that.

  1. The platform cannot be a length of zero, and the platform must be complete (no holes in the platform).

  2. Remember that Jimmy falls off when two of his body parts are hanging off the platform. A body part is one ASCII character of his body.

  3. Trailing whitespace at the end of the platform is not required, but your program should account for both situations, where there is whitespace after the platform and where there is not.

• Be mindful of the standard loopholes that are forbidden.

Test cases

         /o\               ✔️ TRUE
  -------------

/o\                        ✔️ TRUE
 ----------

                    /o\    ❌ FALSE
  ------------------

               /o\         ❌ FALSE
  -------

    /o\                    ❌ FALSE
     -

Scoring

This is code-golf, so lowest byte count wins.

Leaderboard

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• The name of the language (end it with a comma , or dash -), followed by...

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Answer 1

Jelly, 6 bytes

n⁶Sċ2Ẓ

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Explanation:

n⁶Sċ2Ẓ  args: z (e.g. [['/', 'o', '\\'], [' ', '-']] => 0)
        implicit return value: z ([['/', 'o', '\\'], [' ', '-']])
n⁶      dyad-nilad pair ([[1, 1, 1], [0, 1]])
 ⁶       4th command-line argument or space [4th CLA assumed absent] (' ')
n        vectorized inequality ([[1, 1, 1], [0, 1]])
  S     reduction by addition with base case 0 ([1, 2, 1])
   ċ2   dyad-nilad pair (1)
    2    literal (2)
   ċ     number of occurrences of right in left (1)
     Ẓ  primality (0)

Answer 2

JavaScript (ES6), 38 bytes

Takes input as (a)(b). Returns \$0\$ or \$1\$.

a=>b=>b[a.search`o`]=='-'&/--/.test(b)

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How?

We look for the position of the middle part "o" of Jimmy's body in the first string and test wether there's a dash in the second string at the same position.

b[a.search`o`] == '-'

The only case where Jimmy would be unsafe in this situation is with a single-dash platform:

/o\
 -

So we additionally make sure that the platform has a width of at least \$2\$:

/--/.test(b)

---

JavaScript (ES6), 36 bytes

Alternate version if we assume that there's always either dashes or spaces below Jimmy (i.e. the input is rectangular).

a=>b=>b[a.search`o`]!=0&/--/.test(b)

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Takes advantage of the fact that the coercion to a numeric value is \$0\$ for a space and NaN for a dash.

Answer 3

Excel, 67 45 44 bytes

=(MID(A2,FIND("o",A1),1)="-")*(TRIM(A2)>"-")

Put Jimmy in A1, on a platform in A2.

2 conditions checked:

• Is Jimmy's torso (o) on the platform?
• Is the platform more than just -?

Answer 4

Python 3, 88 43 bytes

Input is given in the form of a list containing two strings: the first string is the first line; the second string is the second line.

lambda a:sum(1-(" "in i)for i in zip(*a))>1

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Another version, tying for 43 bytes (I haven't been able to get it shorter than 43):

lambda a,b:b[a.find("/"):][:3].count("-")>1

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Down by 42 bytes thanks to a tip from Jo King.

Old Version:

lambda s:sum((s.split("\n")[1]+" "*len(s))[i]=="-"and s[i]!=" "for i in range(len(s)))>1

-2 bytes thanks to Sriotchilism O'Zaic.

This works by taking two separate inputs, then pairing up corresponding letters. It counts the number of pairs where neither character is a space, then returns True if that number is greater than 1.

Answer 5

Python 2, 42 37 bytes

lambda j,p:'--'in p[j.find('/'):][:3]

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5 bytes thx to negative seven

Answer 6

Perl 6, 18 bytes

{?/''B|Bq/}o&[~^]

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Takes a two parameters and returns a boolean of whether Jimmy will stay on the platform. This works by XORing the two lines together and checking if either part of Jimmy is still on the platform.

Explanation:

             &[~^]   # String XOR operator
{          }o        # Combined with the anonymous function
 ?/       /          # That checks for the regex match
   ''B              # Unprintable, B, which is "/o" ~^ "--"
       |Bq           # Or B, q, which is "o\" ~^ "--"

Answer 7

Haskell, 34 bytes

a#b=[1|(p,'-')<-zip a b,p>' ']>[1]

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I got this one by combining my below technique with the other haskell answer.

Haskell, 45 bytes

x#'-'|x/=' '=1
x#y=0
(((>1).sum).).zipWith(#)

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This counts the number of body parts (non-space characters) that are on top of the platform and then checks it is greater than 1. The reason we count body parts on the platform rather than body parts off is that zipWith will chop the top line to be the length of the bottom and thus can chop off Jimmy's body parts. This prevents us from having to do something like cycle" " to pad the list.

Answer 8

Dyalog APL Extended, 11 10 8 bytes

2≤1⊥∧⌿⍤<

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Explanation:

2≤1⊥∧⌿⍤<  a monadic train
       <  Compare the input with the implicit prototype element - a space.
          Returns a boolean matrix of characters that are greater than 0x20
    ∧⌿⍤   and-reduce that, i.e. places where both Jimmy and a platform is
  1⊥      base 1 decode, aka sum - the amount of body parts over the platform
2≤        is that greater-or-equal to 2?

-2 thanks to Adám.

Answer 9

MathGolf, 6 14 bytes

`^@╞^αmÆû-oñ╧╙

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8 bytes had to be added to account for the edge case presented by Nick Kennedy.

Checks if "-o-" is a substring of the zipped string of both lines, and the zipped string where the first input line has the first character removed. Takes input as two separate strings, with the only change being that the character is input as /o\\, since \\ is the correct way to input a backslash in a string in MathGolf.

Explanation

`                duplicate the top two items
 ^               zip top two elements on stack
  @              rrot3
   ╞             discard from left of string/array
    ^            zip top two elements on stack
     α           wrap last two elements in array
      mÆ         explicit map using 5 operators
        û-oñ     push "-o" and palindromize to make "-o-"
            ╧    pop a, b, a.contains(b)
                 map block ends here
             ╙   max of list

Answer 10

EXCEL, 94 71 bytes . VBA (Excel), 87 bytes

A1 = Jimmy , A2 = platform

-23 bytes. Thank you @Wernisch.

=(FIND("-",A2)-FIND("/",A1)<2)*(FIND("\",A1)-LEN(A2)<2)*(TRIM(A2)<>"-")

?[(FIND("-",A2)-FIND("/",A1)<2)*(FIND("\",A1)-LEN(A2)<2)]*(len(replace([A2]," ",""))>1)

Answer 11

05AB1E (legacy), 9 8 7 bytes

ζðм2ùgp

-1 byte thanks to @Mr.Xcoder with the approach of ðм2ù.

Input as a list of two strings.

Only works in the legacy version of 05AB1E, because ζ can transpose a list of strings as well as a 2D list of characters, whereas the ζ in the new 05AB1E version only works with the 2D list of characters.

Try it online or verify all test cases.

Explanation:

ζ        # Zip/transpose; swapping rows/columns, with space as default filler
 ðм      # Remove all spaces from each string
   2ù    # Only leave strings of size 2
     g   # Count how many there are left
      p  # Check if this is a prime (2 or 3)
         # (after which the result is output implicitly)

Answer 12

Ruby, 28 bytes

->a,b{!(/--/!~b[a=~/\//,3])}

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Answer 13

Excel, 36 bytes

=LEN(TRIM(MID(A2,FIND("/",A1),3)))>1

Jimmy in A1, on a platform in A2.

Finds the position of Jimmy, and takes the 3 bytes of the platform and trims off spaces. If the resulting platform length is long enough, Jimmy stands.

Answer 14

///, 85 93 87 bytes

/~/\/\///\/o\\/(o)~ 
/
~
~/ (o) /(o)~ (o)-/(o)~- -/--~(o) - ~/) ~/)-~/o~/(-/1~-~/(~/)~ 

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Output's a 1 if Jimmy is safe. Otherwise outputs nothing. (Unary 1 and 0.) Because there is no other way to take input in ///, it needs to be hard-coded:

/~/\/\///\/o\\/(o)~ 
/
~
~/ (o) /(o)~ (o)-/(o)~- -/--~(o) - ~/) ~/)-~/o~/(-/1~-~/(~/)~ //<INPUT HERE> 

For example:

/\/o\\/(o)// 
/
//
/// (o) /(o)// (o)-/(o)//- -/--//(o) - ///) ///)-///o///(-/1//-///(///)//         /o\
  ------------- 

(Try it online!)

Note the space after the <INPUT HERE>.

Explanation:

NOTE! The explanation code cannot be run due to the comments. The comments are enclosed in curly braces. Also, the original code uses a golf where // is replaced with ~. This code is omitted from the explanation.

/\/o\\/(o)/            {replace Jimmy with a Jimmy with curvy arms, because slashes are hard to manipulate in this language}
/ 
/
/                      {remove unneeded spaces after Jimmy, but before the floor}

/
//                     {get rid of the line break

/ (o) /(o)/            {remove all the spaces before both Jimmy and the floor}
/ (o)-/(o)/            {for each floor tile, remove it and one space before Jimmy. This detects whether Jimmy lines up with the floor.}
                       {If Jimmy is before the floor, then there will be extra floor.}
                       {If Jimmy is behind the floor, then there will be extra spaces before Jimmy.}
/- -/--/               {Handle the case where there is a hole beneath Jimmy but he is still well-supported}

/(o) - //              {Handle the case where only Jimmy's head is on the floor. The space at the end of the code is necessary for this.}
/) //                  {The rest of the substitutions clean up the result and handle each of the possible results that could exist at this point}
/)-//
/o//
/(-/1/
/-//
/(//
/)//


              /o\   
               --
 {there is a space right before this comment. The comment is only here to make the space visible and explain itself.}

---

• +8 bytes to fix a bug
• -6 bytes by applying a standard /// golf trick.

Answer 15

R, 35 bytes

function(x)sum(colSums(x!=" ")>1)>1

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Based on @EriktheOutgolfer’s excellent Jelly answer so please upvote that one too!

Input is a 2-d matrix of characters.

Answer 16

Haskell, 59 bytes

f a b=sum[1|(p,q)<-zip a$b++cycle" ",elem p"/o\\",q==' ']<2

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The function is called like so: f "/o\\ " " -- "

How it works (for f "/o\\" " -"):

b++cycle" " - Adds an infinite number of spaces after b to ensure that Jimmy is always above a - or (" -" → " - ..."

zip a$b++cycle" " - Zips the two strings together ([('/',' '), ('o','-'), ('\\',' ')])

(p,q)<-zip a$b++cycle - For each pair in the zipped list

[1|(p,q)<-zip a$b++cycle" ",elem p"/o\\",q==' '] - Generates a list of 1s, whose length is the number of pairs satisfying the conditions:

elem p"/o\\" - The character in the top string is one of Jimmy's body parts. (Satisfied by all three pairs in this example)

q==' ' - The character in the bottom string is a space. (Satisfied by ('/', ' ') and ('\\', ' '))

So, the pair has to be one where one of Jimmy's body parts is above a space.

Because in this example, two pairs satisfy both conditions, the list is [1,1]

sum[1|(p,q)<-zip a$b++cycle" ",elem p"/o\\",q==' '] - Take the sum of those 1s (i.e. the length of the list), which in this example is 2.

sum[1|(p,q)<-zip a$b++cycle" ",elem p"/o\\",q==' ']<2 - Check if the number of body parts above a space is less than 2. In this example, it's not, so Jimmy will fall off. :(

Answer 17

C (gcc), 73 bytes

f(s,t,c)char*s,*t;{for(t=strchr(s,c=10);*s%5**t;)c-=*++t%2**s++%8;c=c<0;}

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Answer 18

Kotlin, 60 bytes

fun String.c(b:String)=zip(b){i,j->i>' '&&j>' '}.count{it}>1

Explanation:

fun String.c  # Define an extension function on string, so we don't have to provide a first argument (and we also have string method calls for free)
(b:String)    # Pass the second string as argument
=             # Shorthand syntax for fun body
zip(b)        # Essentially a.zip(b). Creates a List<Pair> by joining both arrays. 
              # Takes care of trailing whitespace, because it will be the size of the smaller array
{i,j->        # Declare a transformer lambda as second function argument
i>' '&&j>' '} # This essentially translates to: If i!=' ' and j=='-'
.count{it}    # Count the true values
>1

Answer 19

///, 57 bytes

/|/\/\///\/o\\/J| J/J*|
/|* /|  -/  | /|*-/|--/!|-/|*/|J|

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Append the input to the end of the program in order to run. Returns the empty string if Jimmy falls off the platform, a string of exclamation points otherwise.

• /|/\/\// replaces | with //, which makes the code both shorter and more readable (| is used to demarcate each replacement)
• /\/o\\/J| J/J*/ replaces Jimmy with J for brevity and changes the space to the left of him to * to the right of him
• The next replacement gets rid of newlines.
• /* /| -/ | // cancels out *s and with the space to the left of the platform. If there are two or more spaces left, Jimmy is falling off to the left, and the platform is deleted. This part also removes any whitespace to the right of the platform.
• /*-/|--/!/ cancels out *s and with length of the platform. If there are at least two - left, Jimmy isn't falling off to the right, so they are replaced with a !.
• /-/|*/|J// deletes every remaining character that isn't !

Answer 20

chevron - 126 bytes

not an improvement over my old answer (at all), but rewritten after a rewrite of chevron itself.

> >^j
0>^i
^i+1>>^i
^j,^i~c>>^h
->+2??^h=/
->-3
> >^q
^q~s>>^s
->+5?^i>^s
^_p>^s
^q^s^s,^i,3~c>>^p
->+2??^s^s^s~^s^p^s
><1
><0

Answer 21

Japt, 8 bytes

Õ·kèS Êz

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Answer 22

C# (Visual C# Interactive Compiler), 44 40 39 bytes

-4 bytes thanks to Jo King

a=>b=>a.Zip(b,(x,y)=>x>y?y:0).Sum()>109

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Answer 23

Retina 0.8.2, 16 bytes

 (.*¶).
$1
¶ ?--

Try it online! Link includes test suite. Explanation:

+`^ (.*¶).
$1

While there is still a space on the first line, and both lines still have more than one character, delete the space and the first character of the next line. Note: This assumes that there is no trailing space after Jimmy. +1 byte needed if trailing space needs to be allowed.

¶ ?--

Check that there are at least two pieces of platform under Jimmy.

Answer 24

PowerShell, 63..55 53 bytes

^{-1 byte thanks to mazzy}

param($j,$f)''+($f|% t*y|?{$j[$i++]-gt32})-match'- -'

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Takes input as two lines.

Unrolled:

param($j,$f)            #Take $jimmy and $floor
''+                     #Implicitly converts next part to string
($f |% ToCharArray      #Convert $f to a char[] and...
    |?{                 #Only take the chars where...
        $j[$i++]-gt32   #The same indexed char in $j's ASCII # is > ' ' i.e. only get /o\
     }
)-match'- -'            #Arrays.ToString are joined with a space and we need 2 -'s

Answer 25

Perl 5 -pl, 42 bytes

/o/g;$_=(($_=<>)=~/./g)[-1+pos]eq'-'&&/--/

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Answer 26

Ruby 2.5.3, 44 bytes

->a,b{a.zip(b).map(&:join).grep(/\S-/).size>1}

Input taken as two arrays. Definitely not the most golf-friendly approach (see G B's answer), but I like any excuse to use the zip function.

Answer 27

Python 3.7, 71 56 Bytes

lambda s:sum(j in'/o\\'and p=='-'for j,p in zip(*s))>1

Very simple version and the shortest I could think of using this approach. Input s is a list of two strings, the first one for the Jimmy-row, the second one for the platform. Zip the characters which are above one another and then check whether - is below a part of Jimmy in at least two instances.

EDIT: Reduced by quite a few Bytes thanks to Blue!

Answer 28

C (gcc), 103 bytes

i,j,l;f(char*s){for(i=0;*s-10;j=*s++-47?j:i)++i;l=strlen(s)>j+1;s+=j;return l&&*s+s[1]+(s[2]?:32)>109;}

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Would be much shorter (75 bytes), if it could be assumed that there is trailing whitespace after the platform.

Answer 29

Retina, 31 29 bytes

^(.)*/.*¶(?<-1>.)*(?(1)!) ?--

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Saved 2 bytes thanks to Neil!

A simple regex that determines whether at least two pieces of the platform are directly beneath Jimmy. Assumes that the input will contain no ! characters.

Answer 30

Japt -¡, 9 bytes

-1 byte if the input can be reversed.

VtUao)è-²

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Answer 31

V, 18 bytes

0vt/"_dj.d3lVkp0#x

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Output whitespace only if jimmy fall of the platform. Output something non-whitespace if jimmy stay on the platform.

Answer 32

Japt -!, 7 bytes

ÕèSi.)z

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ÕèSi.)z     :Implicit input of multi-line string
Õ           :Transpose
 è          :Count the occurrences of
  S         :  Space
   i.       :  Prepended with ".", giving the regex /. /g
     )      :End count
      z     :Floor divide by 2
            :Implicit output as Boolean

Answer 33

Pyth, 9 bytes

!!tt#rL6C

Try it here! _{^{(Note: This is a temporary interpreter, hosted on pythtemp.herokuapp.com; the official pyth.herokuapp.com can't be used for now)}}

If swapping truthy-falsy values were allowed, this would become 8 bytes by dropping one of the !s (awaiting confirmation). Moreover, if outputting an empty list for the case when Jimmy falls and a non-empty list otherwise would be an option, both !s could be dropped.

How it works

!!tt#rL6C – Full program. Receives a list of two strings through STDIN.
        C – Transpose / Zip (switch from rows to columns)
     rL6  – Strip the whitespace on both sides of each column.
   t#     – Filter-keep those that have a tail (i.e. that are length-2).
  t       – Tail. The result will be non-empty iff Jimmy doesn't fall.
!!        – Double negation (to output as a boolean...).

Answer 34

40 column Commodore BASIC (C64, C16/+4, C128, PET, C64Mini) - non-competing* - 98 tokenized and BASIC bytes used

 0a=rN(.)*36:b=rN(.)*39:c=-rN(.)*(b-39):fOi=0tob:a$=a$+"-":nE:?tAa)"/o\
 1?tAc)a$:?-(a>c-2anda<c+b+2)

Here is the unobfuscated listing for explanation purposes

 0 let a=rnd(0) * 36
 1 let b=rnd(0) * 39
 2 let c=-rnd(0) * (b - 39)
 3 for i=0 to b
 4  let a$=a$+"-"
 5 next i
 6 print tab(a);"/o\"
 7 print tab(c);a$
 8 print -(a>c - 2 and a<c + b + 2)

The variable a is used for positioning Jimmy (using PRINT TAB(A) which is zero-indexed).

The varaible b is used for the length of the platform.

And finally the variable c is used for the position of the platform.

The loop in lines 3 through to 5 inclusive builds the platform for Jimmy, with line 6 printing Jimmy at his pre-determined position, and 7 for the pre-determined position of the platform. Finally, 1 or 0 is outputted to represent our TRUE or FALSE value.

Note, the listing includes keyword abbreviations to ensure we break the 80 character limit per line on standard Commodore C64 BASIC.

* Assumed non-competing because PETSCII is not ASCII. Jimmy looks better in PETSCII though, of course.

Answer 35

Attache, 38 bytes

{2>Sum!`~&Sum[Ord@Grid@_-39]=>1'46'65}

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Explanation

We convert the input string to a grid of ASCII codepoints, subtract 39 from each, then take the Sum, columnwise. (Sum[Ord@Grid@_-32]). Then, we bind this array to the ~ operator, which in this case counts the number of times the argument occurs in the bound array. We apply this function to each member of the array 1'46'65 with =>, which correspond to various body parts not above a platform. We then take the sum of this resulting array with Sum!. This is the count of body parts not above the platform. Finally, we check to see that 2 exceeds this sum; if it does, then we return false, for Jimmy has fallen. If it does not, we return true, for Jimmy is quite safe on his perch.

Answer 36

Charcoal, 19 bytes

η⸿Ｐθ…θ⌕θo≔№ＫＭ-ζ⎚›ζ¹

Try it online! Link is to verbose version of code. Outputs - if the Jimmy will balance, nothing if he will fall off. Explanation:

η

Print the platform.

⸿

Move down a line. (Reversed gravity turned out to be golfier.)

Ｐθ

Print Jimmy without moving the cursor.

…θ⌕θo

Print Jimmy's leg leaving the cursor over his body.

≔№ＫＭ-ζ

Count the number of adjacent -s from the platform.

⎚

Clear the canvas.

›ζ¹

Output a - if the platform was large enough.

Answer 37

Brain-Flak, 210 bytes

{({}<>)<>}<>{({}[(()()()()()){}]<>)<>}<>({<(<({}[((()()()()()){}()){}])>{()(<{}>)}{}<{({}<>)<>}{}({}[((((()()()()()))){}{}){}{}])>[()()]{()(<{}>)}<<>{({}<>)<>}<>>)>[()]{()(<{}>)}{}}<>)(()[{<({}())>{()<{}>}}]{})

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String parsing is hard in Brain-Flak. It considers anything on the first line other than space to be Jimmy and anything on the second line other than - to be open air. The reason we test for - instead of space is that Brain-Flak pads the input indefinitely to the right with nulls (ASCII codepoint 0) which we need to consider open air. This luckily means we don't have to worry about needing trailing whitespace in the input.

Answer 38

PHP, 90 80 bytes

Code

<?=substr_count(substr(($v=explode("
",$argv[1]))[1],strpos($v[0],"/"),3),"--");

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Mistakenly coded allowwing jimmy with just a leg on the edge

<?=count($v=explode("
",$argv[1]))>1&&substr_count(substr($v[1],strpos($v[0],"/"),3),"-");

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Explanation

<?=
substr_count(
substr(($v=explode("\n",$argv[1]))[1],// explode and get Jimmy body
        strpos($v[0],"/"),  // find "/" position (position start)
        3),                 // substring of the platform length
        "--");              // platform has to contain "--" somewhere
// 
//

Answer 39

Elm 0.19, 99 bytes

f j p=List.sum(List.map2(\a b->if a/=' '&&b/=' 'then 1 else 0)(String.toList j)(String.toList p))>1

Port of Maxwell's Python 3 answer. Verify all test cases here.

Answer 40

Bash, 49 bytes

[[ "${1:$((`expr index "$0" /`-1)):3}" =~ "--" ]]

Jimmy input as command line parameter 0, the platform as parameter 1; Must be aware of Bash's separating and eating whitespace (use single quotes):

bash -c '[[ "${1:$((`expr index "$0" /`-1)):3}" =~ "--" ]]' '   /o\' '  -------'

Answer 41

Julia 1.0, 42 40 bytes

y(a,b)=strip(b[findfirst("/o\\",a)])>"-"

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