题解 | #二分查找-I#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param nums int整型一维数组 
# @param target int整型 
# @return int整型
#
class Solution:
    def search(self , nums: List[int], target: int) -> int:
        # write code here
        # 若为空则直接返回-1
        if not(nums):
            return -1
        # 以两个端点作为low,high
        low = 0
        high = len(nums) - 1
        while low <= high:
            mid = int((low + high)/2)
            if nums[mid] == target:
                return mid
            elif nums[mid] > target:
                high = mid - 1
            else:
                low = mid + 1
        return -1