Remove Duplicates from Sorted List II, is a LeetCode problem from linked-list subdomain. In this post we will see how we can solve this challenge in Swift

Problem Description

You can find the full details of the problem Remove Duplicates from Sorted List II at LeetCode


Note: Swift provides "===" to compare two objects refer to the same reference

Time Complexity: O(n), Space Complexity: O(1)

Definition for singly-linked list.

public class ListNode {

public var val: Int

public var next: ListNode?

public init(_ val: Int) {

    self.val = val = nil



Please check the main.swift snippet for the solution.

This solution originally posted at: Github by @soapyigu