LeetCode Algorithm 面试题 10.05. 稀疏数组搜索

​​面试题 10.05. 稀疏数组搜索​​

Ideas

没啥好说的，二分搜索就完了，注意过滤空字符串。

Code

Python

from typing import List


class Solution:
  def findString(self, words: List[str], s: str) -> int:
    left, right = 0, len(words) - 1
    while left < right + 1:
      # 过滤空字符串
      while left < right + 1 and not words[left]:
        left += 1
      while left < right + 1 and not words[right]:
        right -= 1
      if left > right:
        return -1

      middle = ((right - left) >> 1) + left
      while middle < right and not words[middle]:
        middle += 1
      if words[middle] == s:
        return middle
      elif words[middle] > s:
        right = middle - 1
      elif words[middle] < s:
        left = middle + 1
    return -1