题解 | #数组中重复的数字#
数组中重复的数字
https://www.nowcoder.com/practice/6fe361ede7e54db1b84adc81d09d8524
class Solution:
#注意类的定义
def duplicate(self,nums):
new_nums = set()
#set()无序且不重复的元素集合
for num in nums:
if num in new_nums:
return num
else:
new_nums.add(num)
return -1
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