题解 | #查找重复元素#
查找重复元素
https://www.nowcoder.com/practice/871a468deecf453589ea261835d6b78b
You will use the arr.filter to find the duplicated array, then return a array, after that, you will
use the Set to remove the repeat item in the array and return this array out
我现在也只有一个保底
太难了
