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Ingy döt Net 2023-07-01 11:58:00 -04:00
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25
Task/Perfect-shuffle/REXX/perfect-shuffle-1.rexx Normal file
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/*REXX program performs a "perfect shuffle" for a number of even numbered decks. */
parse arg X /*optional list of test cases from C.L.*/
if X='' then X=8 24 52 100 1020 1024 10000 /*Not specified? Then use the default.*/
w=length(word(X, words(X))) /*used for right─aligning the numbers. */
do j=1 for words(X); y=word(X,j) /*use numbers in the test suite (list).*/
do k=1 for y; @.k=k; end /*k*/ /*generate a deck to be used (shuffled)*/
do t=1 until eq(); call magic; end /*t*/ /*shuffle until before equals after.*/
say 'deck size:' right(y,w)"," right(t,w) 'perfect shuffles.'
end /*j*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
eq: do ?=1 for y; if @.?\==? then return 0; end; return 1
/*──────────────────────────────────────────────────────────────────────────────────────*/
magic: z=0 /*set the Z pointer (used as index).*/
h=y%2 /*get the half─way (midpoint) pointer. */
do s=1 for h; z=z+1; h=h+1 /*traipse through the card deck pips. */
!.z=@.s; z=z+1 /*assign left half; then bump pointer. */
!.z=@.h /* " right " */
end /*s*/ /*perform a perfect shuffle of the deck*/
do r=1 for y; @.r=!.r; end /*re─assign to the original card deck. */
return

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Task/Perfect-shuffle/REXX/perfect-shuffle-2.rexx Normal file
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/*REXX program does a "perfect shuffle" for a number of even numbered decks. */
parse arg X /*optional list of test cases from C.L.*/
if X='' then X=8 24 52 100 1020 1024 10000 /*Not specified? Use default.*/
w=length(word(X, words(X))) /*used for right─aligning the numbers. */
do j=1 for words(X); y=word(X,j) /*use numbers in the test suite (list).*/
do k=1 for y; @.k=k; end /*generate a deck to be shuffled (used)*/
do t=1 until eq(); call magic; end /*shuffle until before equals after.*/
say 'deck size:' right(y,w)"," right(t,w) 'perfect shuffles.'
end /*j*/
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
eq: do ?=1 for y; if @.?\==? then return 0; end; return 1
/*──────────────────────────────────────────────────────────────────────────────────────*/
magic: z=1; h=y%2 /*H is (half─way) pointer.*/
do L=3 by 2 for h-1; z=z+1; !.L=@.z; end /*assign left half of deck.*/
do R=2 by 2 for h-1; h=h+1; !.R=@.h; end /* " right " " " */
do a=2 for y-2; @.a=!.a; end /*re─assign──►original deck*/
return