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Classic doubly-recursive solution returning the move count:
hanoi n from to via =
if n = 0 then 0
else hanoi (n-1) from via to + 1 + hanoi (n-1) via to from
For n = 10, returns 2^10 - 1 = 1023.
Exercises 4-arg recursion, conditional base case, and tail-position
addition. Uses 'to_' instead of 'to' for the destination param to
avoid collision with the 'to' keyword in for-loops — the OCaml
conventional workaround.
37 baseline programs total.