题解 | 牛牛学数列6
牛牛学数列6
https://www.nowcoder.com/practice/b6321648517247b2ac2e2f80cbc63ae1
def shulie(n):
if n<1:
return False
if n==1:
return 0
if n==2 or n==3:
return 1
if n>=4:
a=n-3
b=n-2
c=n-1
return shulie(a)+2*shulie(b)+shulie(c)
n=int(input())
print(shulie(n))
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