[LeetCode 82] Remove Duplicates from Sorted List II
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.
For example,
Given 1->2->3->3->4->4->5, return 1->2->5.
Given 1->1->1->2->3, return 2->3.
DiffcultyMedium
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[LeetCode 83] Remove Duplicates from Sorted List Easy