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Sorting algorithms/Cocktail sort: Difference between revisions
→{{header|REXX}}: added a faster version of the cocktail sort.
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end /*k*/
end /*until*/
return</lang> <br><br>
===version from Wiki with shifting bounds===
This REXX version can handle an array that may contain blanks or spaces.
The optimization remembers the last swap index and updates the bounds. This reduces the number of comparisons by half.
<lang rexx>/*REXX program sorts an array using the cocktail─sort method, A.K.A.: happy hour sort,*/
/* bidirectional bubble sort, */
/* cocktail shaker sort, ripple sort,*/
/* a selection sort variation, */
/* shuffle sort, shuttle sort, or */
/* a bubble sort variation. */
call gen@ /*generate some array elements. */
call show@ 'before sort' /*show unsorted array elements. */
say copies('█', 101) /*show a separator line (a fence). */
call cocktailSort # /*invoke the cocktail sort subroutine. */
call show@ ' after sort' /*show sorted array elements. */
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
cocktailSort: procedure expose @.; parse arg N /*N: is number of items. */
end$= N - 1; beg$= 1
do while beg$ <= end$
beg$$= end$; new$$= beg$
do j= beg$ to end$; jp= j + 1
if @.j>@.jp then do; _=@.j; @.j=@.jp; @.jp=_; end$$=j; end
end /*j*/
end$= end$$ - 1
do k=end$ to beg$ by -1; kp= k + 1
if @.k>@.kp then do; _=@.k; @.k=@.kp; @.kp=_; beg$$=k; end
end /*k*/
beg$= beg$$ + 1
end /*while*/
return
/*──────────────────────────────────────────────────────────────────────────────────────*/
gen@: @.= /*assign a default value for the stem. */
@.1 ='---the 22 card tarot deck (larger deck has 56 additional cards in 4 suits)---'
@.2 ='==========symbol====================pip======================================'
@.3 ='the juggler ◄─── I'
@.4 ='the high priestess [Popess] ◄─── II'
@.5 ='the empress ◄─── III'
@.6 ='the emperor ◄─── IV'
@.7 ='the hierophant [Pope] ◄─── V'
@.8 ='the lovers ◄─── VI'
@.9 ='the chariot ◄─── VII'
@.10='justice ◄─── VIII'
@.11='the hermit ◄─── IX'
@.12='fortune [the wheel of] ◄─── X'
@.13='strength ◄─── XI'
@.14='the hanging man ◄─── XII'
@.15='death [often unlabeled] ◄─── XIII'
@.16='temperance ◄─── XIV'
@.17='the devil ◄─── XV'
@.18='lightning [the tower] ◄─── XVI'
@.18='the stars ◄─── XVII'
@.20='the moon ◄─── XVIII'
@.21='the sun ◄─── XIX'
@.22='judgment ◄─── XX'
@.23='the world ◄─── XXI'
@.24='the fool [often unnumbered] ◄─── XXII'
do #=1 until @.#==''; end; #= #-1 /*find how many entries in the array. */
return /* [↑] adjust for DO loop advancement.*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
show@: w= length(#); do j=1 for # /*#: is the number of items in @. */
say 'element' right(j, w) arg(1)":" @.j
end /*j*/ /* ↑ */
return /* └─────max width of any line.*/</lang>
{{out|output|text= is identical to the 1<sup>st</sup> REXX version.}} <br><br>
=={{header|Ring}}==
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