Leetcode - Remove Duplicates from Sorted List II
https://leetcode.com/problems/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.
Return the linked list sorted as well.
Example 1:
Input: 1->2->3->3->4->4->5 Output: 1->2->5
Example 2:
Input: 1->1->1->2->3 Output: 2->3
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode() {} * ListNode(int val) { this.val = val; } * ListNode(int val, ListNode next) { this.val = val; this.next = next; } * } */ class Solution { public ListNode deleteDuplicates(ListNode head) { ListNode dummy = new ListNode(); dummy.next = head; ListNode prev = dummy; ListNode node = head; while (node != null) { while (node.next != null && node.val == node.next.val) { node = node.next; } if (prev.next == node) { prev = prev.next; } else { prev.next = node.next; } node = node.next; } return dummy.next; } }
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