Remove Duplicates from Sorted List

最新推荐文章于 2023-01-13 08:10:00 发布

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#LinkedList #Javascript #Interview #Leetcode #Easy

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本文介绍了一种从已排序链表中删除所有重复元素的方法，确保每个元素仅出现一次。通过一个简洁的JavaScript函数实现，该函数遍历链表并移除重复项。

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example,
Given 1->1->2, return 1->2.

Given 1->1->2->3->3, return 1->2->3.

Tags

LinkedList

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Easy Solution

/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */
/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var deleteDuplicates = function (head) {
    if (head === null || head.next === null) {
        return head;
    }

    var node = head;
    var last = node.val;
    while (node.next !== null) {
        if (node.next.val === last) {
            node.next = node.next.next;
        } else {
            last = node.next.val;
            node = node.next;
        }
    }

    if (node.val === last) {
        node = null;
    }

    return head;
};