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
        left = 0
        right = len(nums) - 1
        while left <= right:
            mid = (left + right) // 2
            if target == nums[mid]:
                return mid
            if target < nums[mid]:
                right = mid - 1
            if target > nums[mid]:
                left = mid + 1
        return -1

mid放while循环中间，保证更新中间值即可