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:
        n = len(nums)
        a=0
        if n>0:    
            if nums[0] == target:
                a= 0
            else:
                a=-1
            if nums[n-1] == target:
                a= n-1
            else:
                a=-1
            for i in range(0,n-1):
                if nums[i]!=target:
                    a = -1
            for i in range(0,n):
                if nums[i]==target:
                    a = i
                    break
        else:
            a = -1
        return a