题解 | #数组中重复的数字#

#
# 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 numbers int整型一维数组 
# @return int整型
#
class Solution:
    def duplicate(self , numbers: List[int]) -> int:
        # write code here
        if not numbers:
            return -1
        for  x in numbers:
            if not isinstance(x,int):
                return -1
        numbers2 = list(set(numbers))
        for x in numbers2:
            numbers.remove(x)
        print(numbers[0])
        return numbers[0]