Qmex Steel Construction Full Stack Developer Interview Questions and Answers

Q1. Rest api standards
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Q2. Client server communication
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Q3. Framework related questions
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90 min, DSA, hacker platform 3 question

Q1. 2D DP WITH SPACE OPTIMIZATION
Ans. 
2D DP with space optimization is a technique to reduce memory usage while solving dynamic programming problems.
• Use a 1D array instead of a 2D array to store values in dynamic programming problems.

• Update the values in the 1D array based on the dependencies between subproblems.

• Example: Solving the longest common subsequence problem using 2D DP with space optimization.
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Q2. GRAPH WITH BFS ON TREE
Ans. 
Breadth First Search (BFS) on a tree involves visiting nodes level by level starting from the root.
• Start by visiting the root node, then visit all its children before moving on to the next level

• Use a queue data structure to keep track of nodes to visit next

• Repeat the process until all nodes have been visited
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Q1. Basic C++/OOPS concepts like RAII. Types of constructors/destructors etc. very theoretical
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Q2. Palindrome check
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Q3. Lambda function program
Ans. 
A lambda function program demonstrates the use of anonymous functions in programming.
• Lambda functions are anonymous functions that can be used as arguments to higher-order functions.

• They are often used for short, one-off operations without the need to define a separate function.

• Example: In Python, a lambda function can be used to sort a list of tuples based on the second element: sorted_list = sorted(list, key=lambda x
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Q1. Explain Java oops concepts, exceptions, and java 8 features
Ans. 
Java OOPs concepts include inheritance, polymorphism, encapsulation, and abstraction. Exceptions are used for error handling. Java 8 features include lambda expressions, streams, and functional interfaces.
• OOPs concepts: Inheritance (e.g. class B extends class A), Polymorphism (e.g. method overloading, overriding), Encapsulation (e.g. private variables with public methods), Abstraction (e.g. abstract classes, interfaces...read more
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Aptitude questions basic for 1 hour

Dsa basic to medium questions

Q1. C and security, protocol, middleware
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There was a 1 hr coding test

Q1. It was mostly from the resume
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Q2. Remove duplicates from an array
Ans. 
Remove duplicates from an array of strings
• Iterate through the array and use a Set to store unique values

• Convert the Set back to an array to get the final result
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Q1. What is java? What is variable?
Ans. 
Java is a popular programming language used for developing various applications. A variable is a named memory location used to store data.
• Java is an object-oriented language

• It is platform-independent

• Variables in Java have a specific data type

• Variables can be assigned values and their values can be changed

• Example: int age = 25; String name = "John";
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Q2. What is inheritance? types of inheritance
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Inheritance is a concept in object-oriented programming where a class inherits properties and behaviors from another class.
• Inheritance allows code reuse and promotes code organization.

• There are different types of inheritance: single inheritance, multiple inheritance, multilevel inheritance, and hierarchical inheritance.

• Single inheritance involves a class inheriting from a single base class.

• Multiple inheritance involves...read more
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Q3. 1.Java is a high level language 2.java is a programme is called a set of instructions 3.java run time environment (jre) 4.java is a platform independent. Variable: A variable which is container that some d...read more
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Q4. Inheritance; 1.Acquring the properties of parent class to the child class with out changeing the properties of parent class is known as inheritance 2.inheritanc is a is relationship 3.extends keyword is us...read more
Ans. 
Inheritance is acquiring properties of parent class to child class without changing parent class properties. It is classified into 5 types.
• Inheritance is a way to reuse code and establish a relationship between classes

• The 'extends' keyword is used to implement inheritance in Java

• Examples of inheritance include a 'Car' class inheriting properties from a 'Vehicle' class

• Single level inheritance involves one parent class a...read more
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May I about you ? Which your qualification and which stream

It was easy, basic questions only.

It basic question with sorting and puzzle

Q1. Interview questions were basically form basic of java
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Q1. Basic question as HR askew
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