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83.删除排序链表中的重复元素
给定一个已排序的链表的头 head , 删除所有重复的元素,使每个元素只出现一次 。返回 已排序的链表 。
示例 1:
输入:head = [1,1,2]
输出:[1,2]
示例 2:
输入:head = [1,1,2,3,3]
输出:[1,2,3]
提示:
链表中节点数目在范围 [0, 300] 内
-100 <= Node.val <= 100
题目数据保证链表已经按升序 排列
- 来源:力扣(LeetCode)
- 链接:https://leetcode.cn/problems/remove-duplicates-from-sorted-list
javascript
/**
* Definition for singly-linked list.
* function ListNode(val, next) {
* this.val = (val===undefined ? 0 : val)
* this.next = (next===undefined ? null : next)
* }
*/
/**
* @param {ListNode} head
* @return {ListNode}
*/
var deleteDuplicates = function (head) {
var cur = head
while (cur && cur.next) {
if (cur.next.val === cur.val) {
cur.next = cur.next.next
} else {
cur = cur.next
}
}
return head
}
// test
function ListNode(val, next) {
this.val = val === undefined ? 0 : val
this.next = next === undefined ? null : next
}
var n1 = new ListNode(1)
var n2 = new ListNode(1)
var n3 = new ListNode(2)
n1.next = n2
n2.next = n3
console.log(deleteDuplicates(n1))