Allegion Senior Android Developer Interview Questions and Answers

Q1. As I joined as a Mendix developer, questions are related to mendix and front end.
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Q1. Some hands on questions on mendix and rest apis
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Q1. Typical managerial question answer.. nothing new
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Q1. More like salary negotiations
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2 coding questions based on dp and string

Q1. Oops, dsa and questions on my projects like how will you improve your project
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Q2. Why do you want to join company
Ans. 
I am impressed by the company's innovative projects and collaborative work environment.
• Exciting projects and innovative technologies being used

• Collaborative work environment with opportunities for growth

• Positive company culture and values align with my own

• Strong reputation in the industry
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Program to Reverse linked list

General aptitude questions and technical questions

Q1. Explain OOPS concept and few OOPs related questions
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Q2. Explain your internship experience
Ans. 
Completed a 6-month internship at a tech company, working on developing web applications and improving coding skills.
• Developed and implemented new features for web applications

• Collaborated with team members to troubleshoot and debug code

• Participated in code reviews and provided feedback for improvements

• Learned new technologies and programming languages such as React and Node.js
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Q1. Something about the company
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Q2. Why would you want to work here
Ans. 
I am impressed by the company's innovative projects and collaborative work environment.
• Innovative projects that challenge me to grow as a developer

• Collaborative work environment that fosters learning and teamwork

• Company's reputation for valuing employee growth and development
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Q1. Oops concept in C#
Ans. 
Oops concept in C# refers to Object-Oriented Programming principles like Inheritance, Polymorphism, Encapsulation, and Abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Encapsulation hides the internal state of an object and only exposes necessary functionalities.

• Abstraction focuse...read more
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Q2. Design Patterns in C#
Ans. 
Design patterns in C# are reusable solutions to common problems in software design.
• Design patterns help in creating maintainable and scalable code.

• Some common design patterns in C# include Singleton, Factory, Observer, and Strategy.

• Each design pattern has its own purpose and can be applied in different scenarios.

• Design patterns promote code reusability and improve code organization.
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I am fresher and they have asked all basic C language questions

Round duration - 120 Minutes
Round difficulty - Medium

This was an online MCQ + coding round where we had 1 hour to solve the MCQ's and another 1 hour to solve 2 coding
questions. The MCQ's were related to both General and Technical Aptitude.

Q1. 
Count Inversions Problem Statement
Given an integer array ARR of size N, your task is to find the total number of inversions that exist in the array.
An inversion is defined for a pair of integers in the...read more
Ans. 
Count the total number of inversions in an integer array.
• Iterate through the array and for each pair of indices i and j, check if ARR[i] > ARR[j] and i < j.

• Use a nested loop to compare all pairs of elements in the array.

• Keep a count of the inversions found and return the total count at the end.
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Q2. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation...read more
Ans. 
Find the sum of the subarray with the maximum sum among all subarrays in an array of integers.
• Iterate through the array and keep track of the current sum and maximum sum.

• If the current sum becomes negative, reset it to 0.

• Return the maximum sum found.
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Round duration - 50 Minutes
Round difficulty - Easy

This round had fairly easy coding questions compared to all the rounds and the interviewer was also quite friendly. The interview started with me giving my introduction and then the interview asked me some more questions related to my academics and projects and then finally he switched to the coding questions.

Q1. 
Matrix Transpose Problem Statement
Given a matrix MAT, your task is to return the transpose of the matrix. The transpose of a matrix is obtained by converting rows into columns and vice versa. Specificall...read more
Ans. 
Return the transpose of a given matrix by switching rows into columns and vice versa.
• Iterate through the matrix and swap elements at indices (i, j) and (j, i) to obtain the transpose.

• Ensure the dimensions of the transposed matrix are reversed from the original matrix.

• Handle edge cases like empty matrix or single row/column matrix.
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Q2. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Return the middle element of a singly linked list, or the one farther from the head if there are even elements.
• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• If there are even elements, return the one that is farther from the head node

• Handle edge cases like linked list of size 1 or no midpoint existing
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Q3. 
Remove Character from String Problem Statement
Given a string str and a character 'X', develop a function to eliminate all instances of 'X' from str and return the resulting string.
Input:
The first lin...read more
Ans. 
Develop a function to remove all instances of a given character from a string.
• Iterate through the string character by character and exclude the specified character while constructing the new string.

• Use a StringBuilder or similar data structure for efficient string manipulation.

• Handle edge cases such as empty string or character not found in the input string.

• Ensure the function runs in O(N) time complexity where N is th
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 decent coding questions , the first one was related to Dynamic Programming and the second one was of Sorting. I explained the approaches of both the questions with appropriate complexity analysis and then coded them in a production ready manner. This was followed by the interviewer asking me an interesting puzzle to check my overall aptitude.
So, be prepared for puzzles as well while preparing for interviews.

Q1. 
Subset Sum Equal To K Problem Statement
Given an array/list of positive integers and an integer K, determine if there exists a subset whose sum equals K.
Provide true if such a subset exists, otherwise r...read more
Ans. 
Given an array of positive integers and an integer K, determine if there exists a subset whose sum equals K.
• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store if a subset sum is possible for each element and each sum up to K.

• Initialize the first row and column of the 2D array accordingly.

• Iterate through the array and update the 2D array based on the current element and sum.

• Check if the...read more
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Q2. 
Overlapping Intervals Problem Statement
You are given the start and end times of 'N' intervals. Write a function to determine if any two intervals overlap.
Note:
If an interval ends at time T and anothe...read more
Ans. 
Given start and end times of intervals, determine if any two intervals overlap.
• Iterate through intervals and check if any two intervals overlap by comparing their start and end times

• Sort intervals based on start times for efficient comparison

• Consider edge cases where intervals end and start at the same time
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