LeetCode-83. Remove Duplicates From Sorted List

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问题描述

Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.

Constraints:

  • The number of nodes in the list is in the range [0, 300].
  • -100 <= Node.val <= 100
  • The list is guaranteed to be sorted in ascending order.

解答

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/*
 * @Description: 83. Remove Duplicates from Sorted List
 * @Author: libk
 * @Github: https://github.com/libk
 */
/**
 * 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}
 */
const deleteDuplicates = function (head) {
  let cur = head
  while (cur !== null && cur.next !== null) {
    if (cur.val === cur.next.val) {
      cur.next = cur.next.next
    } else {
      cur = cur.next
    }
  }
  return head
}