leetcode34 Find First and Last Position of Element in Sorted Array

 1 """
 2 Given an array of integers nums sorted in ascending order, find the starting and ending position of a given target value.
 3 Your algorithm's runtime complexity must be in the order of O(log n).
 4 If the target is not found in the array, return [-1, -1].
 5 Example 1:
 6 Input: nums = [5,7,7,8,8,10], target = 8
 7 Output: [3,4]
 8 Example 2:
 9 Input: nums = [5,7,7,8,8,10], target = 6
10 Output: [-1,-1]
11 """
12 """
13 我的做法：双指针法
14 """
15 class Solution:
16     def searchRange(self, nums, target):
17         for i in range(len(nums)):
18             if nums[i] == target:
19                 j = i
20                 while j < len(nums) and nums[i] == nums[j]:#bug 没有写j<len(nums) 下面j+1会溢出
21                     j += 1
22                 return [i, j-1]
23         return [-1, -1]