0083. Remove Duplicates from Sorted List
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https://leetcode.com/problems/remove-duplicates-from-sorted-list
Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.
Example 1:
Example 2:
Constraints:
The number of nodes in the list is in the range [0, 300].
-100 <= Node.val <= 100
The list is guaranteed to be sorted in ascending order.
