题解 | #统计每个月兔子的总数#

#这是一个经典递归问题，也可以用动态规划算法求解
#1.动态规划
def rabbit_population(n):
    if n == 1 or n == 2:
        return 1
    adults = 1
    junior = 1
    for i in range(3,n+1):
        new_rabbit = adults
        adults,junior = new_rabbit + junior,new_rabbit
    return adults


if __name__=='__main__':
    n = int(input())
    print(rabbit_population(n))

F(1) = 1

F(2) = 1

F(3) = 1+1

F(4) = 1+1+1

F(5) = 1+1+1+1+1

......

找到规律F(n) = F(n-1)+F(n-2)

或设置一个循环迭代过程range(3,n+1),初始化adults = 1，junior = 1，--->new_rabbit = adults, adults,junior =new_rabbit + junior,new_rabbit