83. Remove Duplicates from Sorted List
https://leetcode.com/problems/remove-duplicates-from-sorted-list/
Time - O(n)
Space - O(1)
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Given a sorted linked list, delete all duplicates such that each element appear only once.
Example 1:
Input: 1->1->2 Output: 1->2
Example 2:
Input: 1->1->2->3->3 Output: 1->2->3---
Time - O(n)
Space - O(1)
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