Apple Coding Interview Questions
32 Apple coding interview problems with full optimal solutions — 11 easy, 19 medium, 2 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Apple interviewer values, and a FAQ section.
Showing 2 problems of 32
- #32hardfoundational
32. Serialize and Deserialize Binary Tree
Convert a binary tree to a string and back — Apple's UIKit view hierarchy and iCloud backup systems both serialize arbitrary tree structures to transmit state across devices; this hard problem tests whether you can design a stable, lossless encoding for hierarchical data.
- #127hardfrequently asked
127. Word Ladder
Word Ladder is Apple's BFS-on-a-virtual-graph hard. The trick is generating neighbors implicitly — for each word, try replacing each letter with each of 26 alternatives. BFS guarantees the shortest path. Bidirectional BFS is the optimization for the 'now make it faster' follow-up.
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