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RemoveLinkedListElements203.java

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/**

* Remove all elements from a linked list of integers that have value val.

*

* Example:

* Input: 1->2->6->3->4->5->6, val = 6

* Output: 1->2->3->4->5

*/

/**

* Definition for singly-linked list.

* public class ListNode {

* int val;

* ListNode next;

* ListNode(int x) { val = x; }

* }

*/

public class RemoveLinkedListElements203 {

public ListNode removeElements(ListNode head, int val) {

ListNode dummy = new ListNode(0);

dummy.next = head;

ListNode p = dummy;

while (p.next != null) {

if (p.next.val == val) {

p.next = p.next.next;

} else {

p = p.next;

}

}

return dummy.next;

}

public ListNode removeElements2(ListNode head, int val) {

if (head == null) return null;

head.next = removeElements2(head.next, val);

return head.val == val ? head.next : head;

}

}