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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

思路:扫一遍linkedlist,移出对应val的node。注意要用node.next,如果是用Node来遍历的话不方便去掉node。注意head也可能是要移的node。因此用dummy node以便于检查。

/** * 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 dummy=new ListNode(-1);    dummy.next=head;    ListNode copy=dummy;    while(copy.next!=null){        if(copy.next.val==val){            copy.next=copy.next.next;        }else{            copy=copy.next;        }    }    return dummy.next;}}

 

203. Remove Linked List Elements