leetcode python 69. x 的平方根 70. 爬樓梯

兩道很是很是水的題，第一題是知道python自帶的x**y，表示求次方,第二題相似斐波那契數列的遞推公式。python https://leetcode-cn.com/problems/sqrtx/description/ https://leetcode-cn.com/problems/climbing-stairs/description/web class Solution(object):

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