Interview guides / ios

Longest Substring Without Repeating: iOS Interview Question

Longest Substring Without Repeating interview question with a clear example answer for iOS engineers. Practice with AceMobileInterview.

This is a common iOS interview topic: Longest Substring Without Repeating.

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

1. 1.Longest substring length without repeating characters.

   Sliding window + last index map. O(n). Discuss Character vs Unicode scalars in Swift.