Apple Software Developer Interview Questions and Answers

Q1. Array based coding test
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Q2. Second largest salary in DBMS
Ans. 
The second largest salary in a database management system (DBMS) can be found by using the ORDER BY and LIMIT clauses in a SQL query.
• Use the ORDER BY clause to sort the salaries in descending order

• Use the LIMIT clause to retrieve the second row in the sorted result set

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1,1
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Q3. Sum of elements close to target
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Calculate the sum of elements in an array that are closest to a given target value.
• Iterate through the array and calculate the absolute difference between each element and the target value.

• Keep track of the element with the smallest difference and update the sum accordingly.

• Return the sum of elements closest to the target value.
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Q1. Array topics - 2 question from this topic
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Q2. Linkedlist coding problem - 1 problem from this topic
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Sql problem solving - 2 problem from this topic

Q1. Project discussion - projects you worked on
Ans. 
I have worked on various projects including a web application for a retail company and a mobile app for a fitness tracker.
• Developed a web application for a retail company to manage inventory and sales

• Created a mobile app for a fitness tracker to track workouts and progress

• Collaborated with team members to design and implement features

• Utilized technologies such as React, Node.js, and MongoDB
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Q1. What is your weakness
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Q2. What is pn junction diode
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A pn junction diode is a semiconductor device that allows current to flow in one direction only.
• Consists of p-type and n-type semiconductor materials

• When forward biased, allows current to flow easily

• When reverse biased, blocks current flow
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DSA Based - Graph, Trees

Q1. Trie Implementation
Ans. 
Trie is a tree data structure used for efficient retrieval of key-value pairs.
• Trie is also known as prefix tree.

• Each node in a trie represents a single character of a key.

• Trie is commonly used in autocomplete and spell checking algorithms.

• Example: Inserting 'apple' and 'app' into a trie would result in a structure where 'app' is a prefix of 'apple'.
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Q2. LRU Implementation
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LRU (Least Recently Used) is a cache eviction policy that removes the least recently used items first.
• LRU cache stores key-value pairs with a maximum capacity.

• When the cache is full, the least recently used item is removed to make space for new items.

• Each time a key is accessed, it is moved to the front of the cache to indicate it was recently used.
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Aptitude test as usual

Q1. C++ questions , about projects
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Q1. General HR questions
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