转载自：https://leetcode-cn.com/problems/search-insert-position/solution/te-bie-hao-yong-de-er-fen-cha-fa-fa-mo-ban-python-/ leetcode 69 x的平方根 来源：https://www.cnblogs.com/doyi111/p/11787798.html 标签 二分查找
