python 解法

# 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
        for i in range(len(numbers)):
            if(numbers.count(numbers[i])>1):
#                 print("numbers[i]", numbers[i])
#                 break
                return numbers[i]
        return -1