leetcode LinkedList

leetcode 203题

Posted by franki on September 9, 2021

leetcode 203题 移除链表元素

给你一个链表的头节点 head 和一个整数 val ，请你删除链表中所有满足 Node.val == val 的节点，并返回 新的头节点 。

示例 1：

输入：head = [1,2,6,3,4,5,6], val = 6
输出：[1,2,3,4,5]

示例 2：

输入：head = [], val = 1
输出：[]

示例 3：

输入：head = [7,7,7,7], val = 7
输出：[]

思路

双指针

代码

function removeElements(head, val) {
    if (head === null) {
        return head;
    }

    let newHead = new ListNode(0);
    newHead.next = head;
    let prev = newHead;
    let curr = head;

    while (curr) {
        if (curr.val === val) {
            prev.next = curr.next;
        } else {
            prev = curr;
        }
        curr = curr.next;
    }

    return newHead.next;
}

复杂度分析

  • 时间复杂度：O(N)
  • 空间复杂度：O(N)
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