I got stumped on a trivial part of today's challenge - the multi-level sort.
... " the checksum is the five most common letters in the encrypted name, in order, with ties broken by alphabetization..." It didn't even occur to me to sort the secondary (alphabetical) and then the primary way (by frequency). I later peeked at Pascal's and Henry's answer I attempted concatenating the rank of the frequency and the letter NB. http://code.jsoftware.com/wiki/JPhrases/RankClass ranking=: >:@i.~\:~ /:~ (~. ([ ,~ ":@])"0 ranking@:(#/.~) ) 'aaaaabbbzyx' 1a 2b 3x 3y 3z This worked reasonably well But got completely messed up on this /:~ (~. ([ ,~ ":@])"0 ranking@:(#/.~) ) 'zekvierkzferctyftfcrkvivtvzmzex' 10m 10x 10y 1e 1v 1z 4f 4k 4r 4t 8c 8i When it was as simple as this: ([: (~. \: #/.~) /:~) 'zekvierkzferctyftfcrkvivtvzmzex' evzfkrtcimxy ((~. \: #/.~) @: /:~) 'aaaaabbbzyx' abxyz Thanks for sharing your solutions. I keep learning new things Joe ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
