有序列如下:
n = 0: X
n = 1: Y
n = 2: YX
n = 3: YXY
n = 4: YXYYX
n = 5: YXYYXYXY
n = 6: YXYYXYXYYXYYX
n = 7: YXYYXYXYYXYYXYXYYXYXY
n = 8: YXYYXYXYYXYYXYXYYXYXYYXYYXYXYYXYYX
n = 9: YXYYXYXYYXYYXYXYYXYXYYXYYXYXYYXYYXYXYYXYXYYXYYXYXYYXYXY
... ...
当 n 趋于无穷,Y数量和X数量的比值是多少 :-)
另外玲兰过奖。实不能和龙叔相比,种菜除外 :-)