题解 | 牛牛学数列6
牛牛学数列6
https://www.nowcoder.com/practice/b6321648517247b2ac2e2f80cbc63ae1
import sys
def f(n):
if n==1:return 0
elif n==2 or n==3 :return 1
else:
return f(n-3)+2*f(n-2)+f(n-1)
for line in sys.stdin:
a = line.split()
a=int(a[0])
print(f(a))
# print(int(a[0]) + int(a[1]))
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