[LeetCode]83. Remove Duplicates from Sorted List(Easy)
headof a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.
Input: head = [1,1,2,3,3]
Time complexity O(N). We would need both prev and curNode. If prev’s value is equivalent to curNode’s value, set prev.next to curNode.next. Otherwise, move prev to prev.next.