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1 point by akkartik 3117 days ago | link | parent

Oh, I missed a question.

curr in conflicts contains the first or most recently added queen. So in this line I'm 'unpacking' the list of queens into the first and the rest.

  (let (curr . rest)  queens
    ..)
Try it out for yourself at the arc prompt. Compare these two:

  (let (a b) '(1 2 3) b)
  (let (a . b) '(1 2 3) b)