有A,B,C三个柱子，将A柱子上的N个盘子（从大到小排列）移到C柱子上，每次只允许移动一个盘子，并且保证每个柱子上的盘子的排列都是从大到小。(There are three columns, A, B and C, which move the N plates on the A pole from the big to the small to the C pole, and only allow one plate to move each time, and ensure that the arrangement of the plates on each column is large to small.)