|
| 1 | +#================================================== |
| 2 | +#==> Title: 剑指 Offer 53 - II. 0〜n-1中缺失的数字 |
| 3 | +#==> Author: Zhang zhen |
| 4 | +#==> Email: hustmatnoble.gmail.com |
| 5 | +#==> GitHub: https://github.com/MatNoble |
| 6 | +#==> Date: 2/15/2021 |
| 7 | +#================================================== |
| 8 | + |
| 9 | +from typing import List |
| 10 | +class Solution: |
| 11 | + def missingNumber(self, nums: List[int]) -> int: |
| 12 | + nums.insert(0, -1) |
| 13 | + nums.append(len(nums)) |
| 14 | + left, right = 0, len(nums)-1 |
| 15 | + while left < right-1: |
| 16 | + mid = left + (right-left)//2 |
| 17 | + if nums[mid] == (nums[right] + nums[left] - 1) //2: |
| 18 | + left = mid |
| 19 | + else: |
| 20 | + right = mid |
| 21 | + return (nums[left] + nums[right]) // 2 |
| 22 | + |
| 23 | +mat = Solution() |
| 24 | +nums = [0,1,2,3,4,5,6,7,9] |
| 25 | +nums = [0] |
| 26 | +nums = [1] |
| 27 | +mat.missingNumber(nums) |
0 commit comments