题解 | #兔子的数量#
兔子的数量
https://www.nowcoder.com/practice/8783056676de4396b0bf816a3561d62f
#解法一
num = int(input())
i = 1
a = [1,2]
while True:
if(i >= num):
print(a[i])
break
else:
i = i+1
b = a[i-1]+a[i-2]
a.append(b)
###解法二
def fun(n):
a=0
if(n == 1):
a = 2
elif(n == 2):
a = 3
else:
a = fun(n-1)+fun(n-2)
return a
num = int(input())
if(num>=10):
print('Error')
else:
print(fun(num))
