|I read the rules slightly differently, as saying that you can glue up to six bases, all at one time...
I assumed that was a typo, and an email to the article's
author confirmed it, that he meant to say you were allowed
to add two extra nucleotides, not amino acids. The section
before the puzzle discussed adding on one or two nucleotides, so I figured that's what he meant to say in
the puzzle text. Just a note: the above program only generates one
solution. If you're allowed to glue six extra bases, it
would generate alot more :-)
Update: BTW, updated code to a new name - DNA::Stitch. I figured
short was good...(or maybe DNA::Glue or DNA::Protein::Glue...?)
Update: Hmm, with a target sequence of length 250 or more, this recursive solution might not cut it...(then again...)
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