EffiaSoft Senior IOS Developer Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Easy

Q1. 
Level Order Traversal Problem Statement
Given a binary tree of integers, return the level order traversal of the binary tree.
Input:
The first line contains an integer 'T', representing the number of te...read more
Ans. 
Return the level order traversal of a binary tree given in level order with null nodes represented by -1.
• Create a queue to store nodes for level order traversal

• Start with the root node and add it to the queue

• While the queue is not empty, dequeue a node, print its value, and enqueue its children

• Repeat until all nodes are traversed in level order
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Round duration - 45 minutes
Round difficulty - Easy

Q1. What is a deadlock in DBMS, and can you explain the concepts of join and query?
Ans. 
A deadlock in DBMS occurs when two or more transactions are waiting for each other to release locks, causing them to be stuck indefinitely.
• Deadlock is a situation where two or more transactions are unable to proceed because each is waiting for the other to release locks.

• To prevent deadlocks, DBMS uses techniques like deadlock detection and prevention algorithms.

• Joins in DBMS are used to combine rows from two or more ta...read more
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Round duration - 60 Minutes
Round difficulty - Medium

Q1. Design a system for Twitter, outlining the key components and architecture involved.
Ans. 
Design a system for Twitter
• Key components: user profiles, tweets, hashtags, timelines

• Architecture: microservices, load balancers, databases, caching

• Scalability: sharding, replication, CDN

• Real-time processing: streaming APIs, push notifications
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Round duration - 60 Minutes
Round difficulty - Medium

Q1. 
Maximum Subarray Sum Queries
You are provided with an array of ‘N’ integers and ‘Q’ queries. Each query requires calculating the maximum subarray sum in a specified range of the array.
Input:
The first ...read more
Ans. 
Implement a function to calculate maximum subarray sum queries in a given range of an array.
• Iterate through each query and calculate the maximum subarray sum within the specified range using Kadane's algorithm.

• Keep track of the maximum sum found so far and update it as needed.

• Return the maximum subarray sum for each query in the test case.
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Q2. 
Sort 0 1 2 Problem Statement
Given an integer array arr of size 'N' containing only 0s, 1s, and 2s, write an algorithm to sort the array.
Input:
The first line contains an integer 'T' representing the n...read more
Ans. 
Sort an integer array containing only 0s, 1s, and 2s in linear time complexity.
• Use a single scan over the array to sort it in-place.

• Maintain three pointers for 0s, 1s, and 2s and swap elements accordingly.

• Example: Input: [0, 2, 1, 2, 0], Output: [0, 0, 1, 2, 2]
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Round duration - 20 Minutes
Round difficulty - Medium

Directions: Each of the following question has a question and two statements labelled as (i) and (ii). Use the data/information given in (i) and (ii) to decide whether the data are sufficient to answer the question record your answer as

A) If you can get the answer from (1)alone but not from (2)
B) If you can get the answer from (2)alone but not from (1)
C) If can get the answer from (1)and (2)together ,although neither statement by itself suffice
D) If statement (1)alone suffices and statement (2) alone also suffice.
E) If can\'t get the answer from statements (1) and (2) together and you need more data.

Copyright protection is given for a work having originality,i.e. it should be from the author and must have minimum degree of creativity. So it is the author who is the real creator of the work thereby first owner of the copyright and Indian law recognizes author as the firstowner of the copyright .But by the term ‘ownership it means it includes not only theauthor ,but also assignee and can even a legal entity even though not defined in the !ct. InBern convention the term !uthor is not defined, instead it says that the person under whose name the work is disclosed, which implies that it is not necessary that always theauthor should be the owner. "owever Indian copyright !ct defines the tern ‘!uthor withrespect to various works, but still leaves some problems. It becomes more comple# in theconte#t of changing technologies, i.e. cinematographic works, sound recording, broadcasting etc which is a combination of different works, also when author does thework in the course of employment. $hen new technologies emerge, different mode of communication simultaneously arise and the e#ploitation of the copyright by wayof assignment %licensing will add economic benefits to the copyright owner and the provisions of assignment and licensing becomes crucial. By amendments Indian Copyright!ct has taken care of such provisions, but still leaving lacunae % the role of &udiciary becomes crucial in interpreting such provisions for effectively protecting the rights of the authors.

What are the constraints and give example that's include all constraints? 2. Basic SQL queries were asked but I don't remember 3. Then asked questions from my college projects

Q1. Why we use public, private and protect
Ans. 
Public, private, and protected are access modifiers used in object-oriented programming to control the visibility of class members.
• Public: allows access to the member from outside the class

• Private: restricts access to the member only within the class

• Protected: allows access to the member within the class and its subclasses
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Q2. Difference between various SQL joins?
Ans. 
SQL joins are used to combine rows from two or more tables based on a related column between them.
• INNER JOIN: Returns rows when there is at least one match in both tables.

• LEFT JOIN: Returns all rows from the left table, and the matched rows from the right table.

• RIGHT JOIN: Returns all rows from the right table, and the matched rows from the left table.

• FULL JOIN: Returns rows when there is a match in one of the tables.

• C...read more
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The aptitude test is conducted as exam

They provide seperate topic for everyone

They give us a python task