Apple Software Engineer Coding & Algorithms Interview Questions
Practice 30 real Coding & Algorithms interview questions for Software Engineer roles at Apple.
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Compute Earliest Bus Arrival
You are given several bus routes connecting multiple stops. Each route can be represented as directed segments between consecutive stops. For every se...
Rotate a Matrix In Place
Given an n x n integer matrix, rotate it in place by 90 degrees clockwise. As follow-ups, explain how to modify the approach to rotate the same matrix...
Generate Tower of Hanoi moves
You are given n disks of different sizes stacked on peg A (largest at bottom). You have two other pegs, B and C. You may move one disk at a time, and ...
Solve mixed coding tasks from interviews
Solve the following interview-style coding problems (you may choose any programming language unless specified). Provide correct logic and handle edge ...
Solve 15 common Apple coding questions
The post summarizes high-frequency coding problems reported for Apple Software Engineer interviews. Practice the following algorithm and data-structur...
Compute conflicts and minimum meeting rooms
You are given a list of meeting room booking requests. Each request is a half-open time interval [start, end), meaning it uses the room starting at st...
Zero out duplicates and sort an array
Coding question You are given an integer array arr of length about 75. - The data is not sorted. - The array may contain duplicate values. - You must ...
Implement a debounce function
Problem: Implement debounce(fn, wait) Implement a debounce utility function. Behavior Given a function fn and a delay wait (milliseconds), debounce(fn...
Implement a lazy inorder traversal iterator
Design an iterator over a binary tree that returns nodes in inorder sequence (left → root → right) using lazy traversal (i.e., you may not precompute/...
Merge overlapping time intervals
Problem: Merge Intervals You are given an array of intervals intervals, where each interval is a pair [start, end] with start <= end. Merge all overla...
Solve 15 common interview problems
Below are fifteen independent coding problems commonly discussed in software engineering interviews. For each one, write an efficient algorithm and be...
Solve linked list, grid BFS, and median queries
You are given three separate algorithmic tasks. 1) Reorder a linked list by odd/even positions Given the head of a singly linked list, reorder the nod...
Implement flood fill using BFS and DFS
Problem You are given a 2D grid image of size m × n, where each cell contains an integer color value. You are also given a starting cell (sr, sc) and ...
Solve three easy algorithm problems
You are given three independent algorithmic tasks. For each one, explain your approach (no need to run code). 1) Merge two sorted lists (integers inst...
Count subarrays with sum equals k
Given an integer array nums (may contain negative numbers and zeros) and an integer k, return the number of contiguous subarrays whose sum is exactly ...
Refactor rock–paper–scissors for config and ties
Refactor an existing Rock–Paper–Scissors tournament with three robot players so that the number of rounds is configurable and the system also tracks t...
Find k Smallest Pair Sums
Given two integer arrays nums1 and nums2, both sorted in non-decreasing order, and an integer k, return the k pairs with the smallest sums, where each...
Solve interval, grid-fill, and heap tasks
You are asked to solve the following algorithmic problems. Problem 1: Concurrent users from online intervals You are given n inclusive time intervals ...
Maximize funds with capital-gated projects
You start with initial funds W and may undertake at most K projects. Each project i has a required capital C[i] and yields profit P[i]; you can only s...
Implement deep clone for complex objects
Implement a deep-clone function for nested objects in JavaScript (or a language of your choice) without using JSON serialization or third-party librar...