Python查找数组中数值和下标相等的元素示例【二分查找】

# -*- coding:utf-8 -*-
#! python3
class Solution:
  def numberEqualSubscript(self, numbers):
    if numbers == []:
      return -1
    left = 0
    right = len(numbers) - 1
    while(left <= right):
      middle = (left + right) >> 1
      if numbers[middle] == middle:
        return middle
      elif numbers[middle] < middle:
        left = middle + 1
      else:
        right = middle - 1
    return -1
numbers = [-3,-1,1,3,5]
print(Solution().numberEqualSubscript(numbers))