Question 14
Six books sit on three tables as shown.
A type-1 swap exchanges the two books on the same table (example A). A type-2 swap exchanges consecutive books across two neighbouring tables (example B). One round consists of one or more consecutive swaps all of the same type. What is the minimum number of rounds needed to arrange the books as 1,2,3,4,5,6 from left to right?
A type-1 swap exchanges the two books on the same table (example A). A type-2 swap exchanges consecutive books across two neighbouring tables (example B). One round consists of one or more consecutive swaps all of the same type. What is the minimum number of rounds needed to arrange the books as 1,2,3,4,5,6 from left to right?