203. Remove Linked List Elements

203. Remove Linked List Elements

 

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

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

 

java实现

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
public class Solution {
    public ListNode removeElements(ListNode head, int val) {
        ListNode helper = new ListNode(0);
        helper.next = head;
        ListNode p = helper;
        while(p.next != null){
            if(p.next.val == val){
                ListNode next = p.next;
                p.next = next.next;
            }else{
                p = p.next;
            }
        }
        return helper.next;

        
    }
}