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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