0083. Remove Duplicates from Sorted List

https://leetcode.com/problems/remove-duplicates-from-sorted-list

Description

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:

**Input:** head = [1,1,2]
**Output:** [1,2]

Example 2:

**Input:** head = [1,1,2,3,3]
**Output:** [1,2,3]

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.

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