[LeetCode 83] Remove Duplicates from Sorted List
Given a sorted linked list, delete all duplicates such that each element appear only once.
For example,
Given 1->1->2, return 1->2.
Given 1->1->2->3->3, return 1->2->3.
DiffcultyEasy
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[LeetCode 82] Remove Duplicates from Sorted List II Medium