p203

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LeetCode p203 Remove Linked List Elements 题解

1.题目：

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

题意：

去除链表中指定元素。

2.解题思路:

见代码

3.代码

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/**
 * 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 ans = new ListNode(-1);
		ans.next = head;
		ListNode c = ans;
		while (head != null) {
			if (head.val == val) {
				c.next = head.next;
				head = head.next;
				continue;
			}
			c = c.next;
			head = head.next;
		}
		return ans.next;
    }
}

4.一些总结：