Apple Software Development Engineer Intern Interview Questions and Answers

One question of 3 hrs with 50 test cases all needed to pass.

Q1. Core computer science concept. DS, operating system, bits
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Q1. What is your family background?
Ans. 
My family background is diverse and multicultural, with members from different professions and backgrounds.
• My father is a doctor and my mother is a teacher.

• I have two siblings, one is an engineer and the other is a lawyer.

• We have relatives living in different countries, including the USA, India, and Australia.

• Our family gatherings are always filled with interesting conversations and cultural exchange.
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Q2. Share details of your previous job.
Ans. 
I worked as a Software Engineer at XYZ Company.
• Developed and maintained software applications using Java and Python.

• Collaborated with cross-functional teams to gather requirements and design solutions.

• Implemented unit tests and performed code reviews to ensure code quality.

• Participated in agile development processes and attended daily stand-up meetings.

• Resolved bugs and issues reported by users and provided technical s...read more
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Q3. Where do you see yourself in 5 years?
Ans. 
In 5 years, I see myself as a senior software engineer leading a team of developers, working on complex projects and contributing to the growth of the company.
• Leading a team of developers

• Working on complex projects

• Contributing to the growth of the company
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Q4. What are your strengths and weaknesses?
Ans. 
My strengths include problem-solving, attention to detail, and teamwork. My weaknesses include time management and public speaking.
• Strengths: problem-solving

• Strengths: attention to detail

• Strengths: teamwork

• Weaknesses: time management

• Weaknesses: public speaking
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Q5. Tell me about yourself.
Ans. 
I am a software engineer with experience in developing and maintaining software applications.
• I have a Bachelor's degree in Computer Science.

• I have worked on various projects using different programming languages such as Java, C++, and Python.

• I am skilled in software development methodologies like Agile and have experience with version control systems like Git.

• I have strong problem-solving and analytical skills, which h...read more
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Round duration - 90 Minutes
Round difficulty - Medium

Q1. 
Colorful Knapsack Problem
You are given a set of 'N' stones, each with a specific weight and color. The goal is to fill a knapsack with exactly 'M' stones, choosing one stone of each color, so that the to...read more
Ans. 
The goal is to fill a knapsack with exactly 'M' stones, choosing one stone of each color, minimizing the unused capacity.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to keep track of the minimum unused capacity for each color and weight combination.

• Iterate through the stones and colors to update the array with the minimum unused capacity.

• Return the minimum unused capacity from the array a
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Round duration - 24 hours
Round difficulty - Medium

Round duration - 25 minutes
Round difficulty - Easy

Q1. About cypress automation tool
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Q2. Javascripts basics and testing basics
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Round duration - 40 minutes
Round difficulty - Medium

It was conducted on hackkerank. MCQs cover various topics including -Data Structures, Aptitude, etc

Q1. 
Count Diagonal Paths
You are given a binary tree. Your task is to return the count of the diagonal paths to the leaf of the given binary tree such that all the values of the nodes on the diagonal are equa...read more
Ans. 
Count the number of diagonal paths in a binary tree where all nodes on the diagonal have equal values.
• Traverse the binary tree in a diagonal manner and keep track of nodes with equal values.

• Use recursion to explore all possible diagonal paths in the tree.

• Count the number of paths where all nodes on the diagonal have the same value.
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Round duration - 20 minutes
Round difficulty - Medium

This round was conducted on skype. Questions were mainly personality based rather knowledge.

Round duration - 120 Minutes
Round difficulty - Medium

The round had 2 coding problems to solve with varying difficulty. Each candidate had a different set of questions. The round was around 2 pm. The webcam was turned on to keep an eye on candidates.

Q1. 
Bursting Balloons Problem
Given an array ARR of size N, where each element represents the height of a balloon. The task is to destroy all balloons by shooting arrows from left to right. When an arrow hits...read more
Ans. 
Find the minimum number of arrows needed to burst all balloons by shooting arrows from left to right.
• Sort the array in non-decreasing order to make it easier to calculate the minimum number of arrows needed.

• Iterate through the sorted array and count the number of times the height decreases compared to the previous balloon.

• The count of decreases + 1 will give the minimum number of arrows needed to burst all balloons.

• Exa...read more
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Q2. 
Count Leaf Nodes in a Binary Tree
Count the number of leaf nodes present in a given binary tree. A binary tree is a data structure where each node has at most two children, known as the left child and the...read more
Ans. 
Count the number of leaf nodes in a binary tree.
• Traverse the binary tree and check if both left and right children are NULL to identify leaf nodes.

• Use recursion to traverse the tree efficiently.

• Keep track of the count of leaf nodes as you traverse the tree.

• Handle base cases where the current node is NULL or a leaf node.
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 questions related to DSA. I was first asked to explain my approach with proper complexity analysis and then code the soution in any IDE that I prefer.

Q1. 
Rod Cutting Problem Statement
Given a rod of a certain length, the rod can be divided into different sizes, each with an associated cost. Your task is to determine the maximum cost that can be obtained by...read more
Ans. 
The Rod Cutting Problem involves maximizing the profit obtained by cutting a rod into smaller pieces and selling them.
• Use dynamic programming to solve this problem efficiently.

• Create a table to store the maximum profit for each sub-length of the rod.

• Iterate through the rod lengths and update the table with the maximum profit.

• The final answer will be the maximum profit for the total length of the rod.
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Q2. 
Count Subarrays with Given XOR Problem Statement
You are given an array of integers ARR and an integer X. Your task is to determine the number of subarrays of ARR whose bitwise XOR is equal to X.
Example...read more
Ans. 
Count the number of subarrays in an array whose XOR is equal to a given value.
• Iterate through the array and keep track of XOR values and their frequencies using a hashmap.

• For each element in the array, calculate the XOR with the current element and check if the required XOR value exists in the hashmap.

• Increment the count of subarrays whenever the required XOR value is found in the hashmap.
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 questions of DSA of Easy-Medium difficulty and at the end I was asked a Puzzle to check my general problem solving ability.

Q1. 
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
• 0 - representing an empty cell
• 1 - representing a fre...read more
Ans. 
Find the minimum time required to rot all fresh oranges in a grid.
• Use Breadth First Search (BFS) to simulate the rotting process of oranges.

• Keep track of the time taken to rot all oranges and the count of fresh oranges remaining.

• If all fresh oranges are not rotten after simulation, return -1.

• Handle edge cases like empty grid or no fresh oranges present.

• Example: For the given grid, the minimum time required is 4 seconds
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Q2. 
Detect and Remove Loop in Linked List
For a given singly linked list, identify if a loop exists and remove it, adjusting the linked list in place. Return the modified linked list.
Expected Complexity:
A...read more
Ans. 
Detect and remove loop in a singly linked list in place with O(n) time complexity and O(1) space complexity.
• Use Floyd's Cycle Detection Algorithm to identify the loop in the linked list.

• Once the loop is detected, use two pointers approach to find the start of the loop.

• Adjust the pointers to remove the loop and return the modified linked list.

• Example: For input 5 2 and 1 2 3 4 5, return 1 2 3 4 5 without the loop.
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Q3. You have two wires of different lengths that are both capable of burning for exactly one hour when ignited at both ends. How can you measure a time interval of 45 minutes using these two wires?
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Round duration - 50 Minutes
Round difficulty - Medium

This round had 2 Algorithmic questions wherein I was supposed to code both the problems after discussing their
approaches and respective time and space complexities . After that , I was grilled on some OOPS concepts related to C++.

Q1. 
Longest Palindromic Substring Problem Statement
You are provided with a string STR of length N. The task is to find the longest palindromic substring within STR. If there are several palindromic substring...read more
Ans. 
Given a string, find the longest palindromic substring within it.
• Iterate through the string and expand around each character to find palindromes

• Keep track of the longest palindrome found so far

• Return the longest palindromic substring
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Q2. 
Quick Sort Problem Statement
You are provided with an array of integers. The task is to sort the array in ascending order using the quick sort algorithm.
Quick sort is a divide-and-conquer algorithm. It ...read more
Ans. 
Yes, the quick sort algorithm can be enhanced to achieve NlogN complexity in the worst case by using a randomized version of the algorithm.
• Randomized quick sort involves randomly selecting the pivot element to reduce the chances of worst-case scenarios.

• By choosing a random pivot, the algorithm becomes less predictable and more likely to achieve the desired time complexity.

• This enhancement helps in avoiding the worst-ca...read more
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Q3. What are friend functions in C++?
Ans. 
Friend functions in C++ are functions that are not members of a class but have access to its private and protected members.
• Friend functions are declared inside a class with the keyword 'friend'.

• They can access private and protected members of the class.

• They are not member functions of the class, but have the same access rights as member functions.

• Friend functions are useful for implementing operators that are not part ...read more
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Q4. What is the difference between Early Binding and Late Binding in C++?
Ans. 
Early binding is resolved at compile time while late binding is resolved at runtime in C++.
• Early binding is also known as static binding, where the function call is resolved at compile time based on the type of the object.

• Late binding is also known as dynamic binding, where the function call is resolved at runtime based on the actual type of the object.

• Early binding is faster as the function call is directly linked to ...read more
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Round duration - 24 hours
Round difficulty - Easy

It was a hackathon we were given a problem statement and we had to solve that within 2 days. There were team of 4 people.

Q1. You had to build a chatbot. Can you describe the design process and the key considerations you took into account?
Ans. 
The design process for building a chatbot involves defining user goals, choosing a platform, designing conversation flow, implementing natural language processing, and testing for accuracy.
• Define user goals and objectives for the chatbot

• Choose a platform or framework for building the chatbot (e.g. Dialogflow, Microsoft Bot Framework)

• Design the conversation flow and user interactions

• Implement natural language processing...read more
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Round duration - 15 minutes
Round difficulty - Easy

HR round

I am read to test for round number one.

I also ready for this and this is so effective for me.