# 448. Find All Numbers Disappeared in an Array ###### tags: `hash table` https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/  ## 思路: 1. 一樣建立hash table把這個list 出現過的element 當成key 然後重複出現當成value 2. hash table 不能用set 替代,因為有累積數字問題,set 只能達到hash table 的key 3.
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