题解 | #兔子的数量#
兔子的数量
https://www.nowcoder.com/practice/8783056676de4396b0bf816a3561d62f
def sum(n):
    if n==1:
        return 2
    elif n==2:
        return 3
    else:
        return sum(n-1)+sum(n-2)
n=int(input())
print(sum(n))
兔子的数量
https://www.nowcoder.com/practice/8783056676de4396b0bf816a3561d62f
def sum(n):
    if n==1:
        return 2
    elif n==2:
        return 3
    else:
        return sum(n-1)+sum(n-2)
n=int(input())
print(sum(n))
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