Remove Linked List Elements (E)
題目
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
題意
將給定鏈表中所有含有指定值的結點洗掉，
思路
注意需要連續洗掉結點的情況，
代碼實作
Java
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode removeElements(ListNode head, int val) {
ListNode dumb = new ListNode(0);
dumb.next = head;
ListNode pre = dumb;
ListNode cur = head;
while (cur != null) {
if (cur.val == val) {
pre.next = cur.next;
cur = cur.next;
} else {
pre = pre.next;
cur = cur.next;
}
}
return dumb.next;
}
}
JavaScript
/**
* @param {ListNode} head
* @param {number} val
* @return {ListNode}
*/
var removeElements = function (head, val) {
let dummy = new ListNode(0, head)
let pre = dummy
let cur = head
while (cur) {
if (cur.val === val) {
pre.next = cur.next
} else {
pre = cur
}
cur = cur.next
}
return dummy.next
}
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標籤：其他