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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul);
dispatch_async(queue, ^{
        NSURL *url = [NSURL URLWithString: @"http://upload.wikimedia.org/wikipedia/commons/7/7f/Williams_River-27527.jpg"];
        NSURLSessionDownloadTask *downloadPhotoTask = [[NSURLSession sharedSession]
        downloadTaskWithURL:url completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
        UIImage *downloadedImage = [UIImage imageWithData:
          [NSData dataWithContentsOfURL:location]];
        }];
        [downloadPhotoTask resume];
});

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var localIdSet = Set<Int>()
var netIdSet = Set<Int>()
let idToDelete = localIdSet.subtracting(netIdSet)

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var localIdSet = Set<Int>()
var netIdSet = Set<Int>()
let idToDelete = localIdSet.subtracting(netIdSet)

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class Node {
  var visited = false
  var connections: [Connection] = []
}

class Connection {
  public let to: Node
  public let weight: Int
  
  public init(to node: Node, weight: Int) {

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//98. Validate Binary Search Tree
class TreeNode {
    var val: Int
    var left: TreeNode?
    var right: TreeNode?
    init(_ val: Int) {
        self.val = val
        self.left = nil
        self.right = nil
    }

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- (void)applicationDidEnterBackground:(UIApplication *)application
{
	// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
	// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
	
	NSLog(@"%s", __FUNCTION__);
	
	__block UIBackgroundTaskIdentifier task = [application beginBackgroundTaskWithExpirationHandler:^{
		
		NSLog(@"Expiration handler called %f",[application backgroundTimeRemaining]);

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final class SharedTokenManager {
    
    private let tokenKey = "token"
    private let accessGroup: String
 
    init(accessGroup: String) {
        self.accessGroup = accessGroup
    }
    
    func getToken() -> String? {

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//
//  CircularProgressBarViewController.swift
//  iOS_CoreAnimation_Advanced_practice
//
//  Created by Anton Makarenkov on 08/08/2020.
//  Copyright © 2020 Anton Makarenkov. All rights reserved.
//

import UIKit

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let basicAnimation = CABasicAnimation(keyPath: "bounds")

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let phones: [Phone] = [
    .init(model: "Samsung A3", manufacturer: "Samsung"),
    .init(model: "iPhone 13", manufacturer: "Apple")
]
let phoneModels = phones.map(\.model)