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Take six coins of the same size and arrange them
in the capital L altering their heads and tails as shown in the
illustration - left position.
The goal is to make another L with all the coins having their heads
and tails exchanged as shown in the right position of the
illustration. It should be performed in the fewest possible number of
moves.
A move consists of sliding a pair of the two adjoining coins to a new
place. You have to slide the coins only orthogonally; it means that
you are not allowed to rotate the pair of coins while you move it. The
final L not necessarily has to be formed exactly at the same spot as
the start L was. |
