Terens777

final class UnfairLock {
    private var _lock: UnsafeMutablePointer<os_unfair_lock>
    
    init() {
        _lock = UnsafeMutablePointer<os_unfair_lock>.allocate(capacity: 1)
        _lock.initialize(to: os_unfair_lock())
    }
    
    deinit {

Terens777

import Foundation

/*

You are given two non-empty linked lists representing two non-negative integers.
The digits are stored in reverse order, and each of their nodes contains a single digit. 
Add the two numbers and return the sum as a linked list.
You may assume the two numbers do not contain any leading zero, except the number 0 itself.