题解 | #统计每个月兔子的总数#
统计每个月兔子的总数
https://www.nowcoder.com/practice/1221ec77125d4370833fd3ad5ba72395
n=int(input())
a1=1
a2=0
a3=0
if n==1:
print(a1)
else:
for i in range(2,n+1):
a3+=a2
a2=a1
a1=a3
print(a1+a2+a3)
统计每个月兔子的总数
https://www.nowcoder.com/practice/1221ec77125d4370833fd3ad5ba72395
n=int(input())
a1=1
a2=0
a3=0
if n==1:
print(a1)
else:
for i in range(2,n+1):
a3+=a2
a2=a1
a1=a3
print(a1+a2+a3)
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