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Ingy döt Net 2013-06-05 21:47:54 +00:00
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Task/Dinesmans-multiple-dwelling-problem/Factor/dinesmans-multiple-dwelling-problem.factor Normal file
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USING: kernel
combinators.short-circuit
math math.combinatorics math.ranges
sequences
qw prettyprint ;
IN: rosetta.dinesman
: /= ( x y -- ? ) = not ;
: fifth ( seq -- elt ) 4 swap nth ;
: meets-constraints? ( seq -- ? )
{
[ first 5 /= ] ! Baker does not live on the top floor.
[ second 1 /= ] ! Cooper does not live on the bottom floor.
[ third { 1 5 } member? not ] ! Fletcher does not live on either the top or bottom floor.
[ [ fourth ] [ second ] bi > ] ! Miller lives on a higher floor than does Cooper.
[ [ fifth ] [ third ] bi - abs 1 /= ] ! Smith does not live on a floor adjacent to Fletcher's.
[ [ third ] [ second ] bi - abs 1 /= ] ! Fletcher does not live on a floor adjacent to Cooper's.
} 1&& ;
: solutions ( -- seq )
5 [1,b] all-permutations [ meets-constraints? ] filter ;
: >names ( seq -- seq )
[ 1 - qw{ baker cooper fletcher miller smith } nth ] map ;
: dinesman ( -- )
solutions [ >names . ] each ;