Spoiler (my solution, looking for feedback) . . . . . . . . F =: #-(+:@(+/@('('&i.)))
If S is the string from the site, then F S returns the ending floor (the first part of the challenge). Any suggestions on improving the syntax are welcome, I only dabble in J. thx gc ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm