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 ):
        # write code here
        numbers = sorted(numbers)
        n = len(numbers)
        if n == 0: return -1
        for i in range(1,n):
            if numbers[i-1] - numbers[i] == 0:
                return numbers[i]