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Remove Duplicates from an Linked List

LinkedList Cracking The Coding Interview Duplicate Letters

Problem

Write code to remove duplicates from an unsorted linked list.

FOLLOW UP

How would you solve this problem if a temporary buffer is not allowed?

How to Solve

By using HashSet, I can control if each value appears or not already. And in case I want to traverse, I can check it by using next property in LinkedListNode.

In Follow Up case

By using double while loops, I can do the same task like this.