1.古典问题：有一对兔子，从出生后第3个月起每个月都生一对兔子，小兔子长到第四个月后每个月又生一对兔子，假如兔子都不死，问每个月的兔子总数为多少？ 2.素数打印 3.水仙花数-A classical problem: a pair of rabbits, from the first three months after birth are born every month a pair of rabbits, bunnies grow up to four months after the f