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RemoveDuplicatesFromSortedListII.java

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RemoveDuplicatesFromSortedListII.java

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public class Solution {

public ListNode deleteDuplicates(ListNode head) {

if (head == null || head.next == null) {

return head;

}

ListNode dummy = new ListNode(0);

dummy.next = head;

ListNode pre = dummy;

ListNode skip = pre.next;

while (skip != null && skip.next != null) {

while (skip.next != null && skip.next.val == skip.val) {

skip = skip.next;

}

if (pre.next != skip) {

pre.next = skip.next;

skip.next = null;

skip = pre.next;

} else {

pre = pre.next;

skip = skip.next;

}

}

return dummy.next;

}

}