Add Two Numbers, is a LeetCode problem from math subdomain. This problem has also been asked in companies like Airbnb,Amazon,Microsoft during the interview. 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 Add Two Numbers at LeetCode


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