LeetCode 509. Fibonacci Number--Python解法

题目地址：Fibonacci Number - LeetCode

The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is,

F(0) = 0, F(1) = 1
F(N) = F(N - 1) + F(N - 2), for N > 1.
Given N, calculate F(N).

Example 1:

Input: 2
Output: 1
Explanation: F(2) = F(1) + F(0) = 1 + 0 = 1.

Example 2:

Input: 3
Output: 2
Explanation: F(3) = F(2) + F(1) = 1 + 1 = 2.

Example 3:

Input: 4
Output: 3
Explanation: F(4) = F(3) + F(2) = 2 + 1 = 3.

Note:

0 ≤ N ≤ 30.

最经典的斐波那契数列，有多种解法。

标准解法如下：

class Solution:def fib(self, N: int) -> int:if N == 0 or N == 1:return Na, b = 0, 1for i in range(1, N):a, b = b, a+breturn b

当然，如果你直接套公式，速度自然更快。

其他解法也不写了。

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