56 - ZOJ Monthly, October 2006 - 1006
One day, a team of archaeologists found a figure and some ancient charactors at a relique. The figure was made up of n points distributing on a circle symmetrically.
Each test case contains an integer n and a string S in a line. n is the number of points in the figure and S is a string made up of distinct capital letters, each indicating a color that can be used to redraw the figure. 3 <= n <= 50.
Each case outputs the maximum times they may try in one line. Note that two figures are considered the same if one can be obtained by having rotation and mirroring on the other one.
3 BW 3 RGB 4 RG
4 10 19
Author: GUAN, Yao