题解 | #兔子的数量#
兔子的数量
https://www.nowcoder.com/practice/8783056676de4396b0bf816a3561d62f
def f(n):
if n>=3:
sum = f(n-1)+f(n-2)
return sum
elif n==2:
return 3
elif n==1:
return 2
else:
print('输入正确的月份')
n = int(input())
print(f(n))
