题解 | 数组中重复的数字
数组中重复的数字
https://www.nowcoder.com/practice/6fe361ede7e54db1b84adc81d09d8524
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# 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
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# @param numbers int整型一维数组
# @return int整型
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class Solution:
def duplicate(self , numbers: List[int]) -> int:
# write code here
s = set(numbers)
if len(s)==len(numbers):
return -1
for x in s:
if numbers.count(x)>1:
return x
