大家都知道斐波那契数列,现在要求输入一个整数n,请你输出斐波那契数列的第n项。(n<=39)
# -*- coding:utf-8 -*-
class Solution:
def Fibonacci(self, n):
# write code here
if n <= 1:
return n
first, second, third = 0, 1, 0
for i in range(2, n+1):
third = first + second
first = second
second = third
return third