LeetCode Challenge — Find All Duplicates in an Array 8/6 #442

Input:
[4,3,2,7,8,2,3,1]
Output:
[2,3]
  1. Get index, calculate the index based on the key.
  2. Get the index position according to the index
  3. Obtain the key-value pair LinkList corresponding to the index position
  4. Traverse the key-value pair LinkList and find the corresponding Entry key-value pair according to the key.
  5. Get the value.

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