Interview guides / ios

Two Sum in Swift: iOS Interview Question

Two Sum in Swift interview question with a clear example answer for iOS engineers. Practice with AceMobileInterview.

This is a common iOS interview topic: Two Sum in Swift.

Below is a concise answer you can adapt in a real interview, then go deeper in the full AceMobileInterview track.

1. 1.Given an array of integers and a target, return indices of two numbers that add up to the target. Explain time/space complexity.

   Use a dictionary from value → index while iterating once. For each num, look up target - num. O(n) time, O(n) space. Mention edge cases: duplicates, empty array, and that you must not reuse the same index.