two sums from leetcode, NSOperation vs GCD, View life cycle, tuple

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The interview question covers topics like solving two sum problems, NSOperation vs GCD, view life cycle, and tuples.

Two sum problems involve finding two numbers in an array that add up to a specific target. Example: [2, 7, 11, 15], target = 9
NSOperation and GCD are both used for concurrent programming in iOS. NSOperation provides more control and features, while GCD is lower level and more lightweight.
View life cycle in iOS involves methods like viewDidLoad, viewWillAppear, viewDidAppear, etc., which are called at different stages of a view controller's life cycle.
Tuples in Swift allow you to group multiple values together. Example: let person = (name: 'John', age: 30)

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