C++ (Coding): Data Structures & Objects Test

The C++ (Coding): Data Structures & Objects Test evaluates a candidate's proficiency in C++ with a focus on data structures and object-oriented programming. The test includes scenario-based MCQs to assess knowledge of C++ concepts and a coding question to evaluate hands-on programming skills. This test is ideal for roles requiring expertise in C++ and data structures.

Covered skills:

Object Oriented Programming
Data Structures
Pointers and Memory Management
Standard Template Library
Algorithms
Exception Handling
Polymorphism
Class Design
Inheritance
Encapsulation
Dynamic Binding
Templates

Test Duration

30 mins

Difficulty Level

Moderate

Questions

5 C++ MCQs
1 C++ Coding Question

Availability

Ready to use

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About the C++ (Coding): Data Structures & Objects Assessment Test

The C++ (Coding): Data Structures & Objects Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Demonstrate a solid understanding of C++ syntax and programming constructs
Apply object-oriented principles to design effective C++ solutions
Create and manipulate complex data structures for efficient data handling
Utilize pointers and manage memory accurately to optimize performance
Implement and work with standard template library components proficiently
Design algorithms to solve problems efficiently and effectively
Handle exceptions and errors gracefully in C++ programs
Implement polymorphism to enhance code flexibility and reusability
Skillfully design classes with thoughtful use of inheritance and encapsulation
Employ dynamic binding for runtime flexibility in C++ applications
Leverage templates to create generic and reusable code components
Integrate advanced C++ features to streamline coding processes

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this C++ (Coding): Data Structures & Objects Test will be non-googleable.

🧐 Question
Hard Signal Network	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Hard Signal Network	30 mins Coding	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Signal Network	Coding	Hard	30 mins	Solve
A secret communication network is built between cities. Each city sends out signals to others, but signals can only flow forward from a city with a lower signal strength to one with a higher signal strength. You are given: 1. An array "signals" where "signals[i]" represents the strength of city 'i'. 2. A list of "connections" (edges), where each connection [u, v] means a directed link from city 'u' to city 'v'. You must find the longest possible chain of cities where: 1. Each city is connected to the next (via directed edges). 2. The signal strengths are strictly increasing along the chain. Input: 1. An integer n → number of cities 2. An array signals of length n 3. An array of edges (directed connections between cities) Output: Print the length of the longest increasing-signal chain. Example: Input: n = 6 signals = [2, 4, 3, 5, 1, 6] edges = [[0,1], [0,2], [2,3], [1,3], [3,5], [4,0]] Output: 4 Explanation: Optimal path: 4 → 0 → 2 → 3 → 5 Signal strengths (strictly increasing) for the path: 1 → 2 → 3 → 5 → 6 Length: 5
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

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Why you should use Pre-employment C++ (Coding): Data Structures & Objects Test?

The C++ (Coding): Data Structures & Objects Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Managing object lifecycles using constructors and destructors.
Implementing basic data structures such as arrays and linked lists.
Using pointers to manage memory dynamically.
Applying Standard Template Library containers and algorithms.
Writing recursive algorithms for problem-solving.
Handling exceptions and errors using try and catch blocks.
Applying polymorphism through virtual functions.
Designing basic class structures with Encapsulation.
Implementing inheritance for code reuse and extensibility.
Using templates for generic programming.

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the C++ (Coding): Data Structures & Objects Test?

Object Oriented Programming: Object Oriented Programming (OOP) is a paradigm that uses 'objects' to design applications and software. It encapsulates data and behavior into manageable modules, fostering code reuse and scalability. Understanding OOP is crucial for maintaining and implementing complex systems efficiently.

Data Structures: Data Structures are methods of organizing and storing data for efficient access and modification. Mastery of data structures like arrays, lists, and trees is essential for solving complex computational problems. They are foundational to writing efficient code that optimally utilizes memory and processing power.

Pointers and Memory Management: Pointers provide direct access to memory locations, allowing dynamic memory allocation and complex data structures like linked lists. Effective memory management ensures resource efficiency and prevents leaks, making it a critical skill for developing performance-driven applications.

Standard Template Library: The Standard Template Library (STL) provides a collection of pre-built algorithms and data structures that facilitate efficient programming. Familiarity with STL components like vectors, stacks, and iterators encourages quick implementation of complex features, enhancing productivity.

Algorithms: Algorithms are step-by-step procedures or formulas for solving problems, and their efficiency can significantly influence application performance. Proficiency in algorithms is vital for optimizing operations such as sorting, searching, and traversing data structures.

Exception Handling: Exception Handling provides a way to gracefully handle unexpected runtime errors, ensuring the program continues to function under unforeseen conditions. By implementing effective exception handling, developers can enhance software reliability and user experience.

Polymorphism: Polymorphism allows objects to be treated as instances of their parent class, enabling one interface to control access to a general class of actions. This key OOP concept simplifies code maintenance and increases its extensibility and flexibility.

Class Design: Class Design involves creating blueprints for objects, defining their attributes and behaviors. Proper class design results in modular, reusable, and extendable software components, which are the building blocks of robust systems.

Inheritance: Inheritance is the mechanism by which one class can inherit the attributes and methods of another, promoting code reuse and hierarchical class relationships. It is fundamental in establishing a natural and logical organization of complex systems.

Encapsulation: Encapsulation restricts access to certain components of an object while exposing only necessary parts. It protects the integrity of the data by preventing unintended interference and misuse, thus ensuring a clear separation of interface and implementation.

Dynamic Binding: Dynamic Binding allows method calls to be resolved at runtime based on the object's actual derived type, rather than its compile-time type. It supports polymorphic behavior and operating system flexibility for overriding methods during execution.

Templates: Templates enable the writing of generic and reusable code components that work with any data type. This feature of C++ allows for code that is both type-safe and adaptable, facilitating powerful abstractions and reducing redundancy.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for C++ (Coding): Data Structures & Objects Test to be based on.

C++ Syntax

OOP Principles

Data Structures

Memory Management

STL Containers

STL Algorithms

Exception Handling

Polymorphism

Class Design

Inheritance

Encapsulation

Dynamic Binding

Templates

Smart Pointers

Linked Lists

Binary Trees

Hash Maps

Sorting Algorithms

Search Algorithms

Recursion

Lambda Expressions

Friend Functions

Operator Overloading

Virtual Functions

Pure Virtual

Abstract Classes

Multiple Inheritance

Function Templates

Class Templates

Move Semantics

RAII Techniques

Iterators

Streams

Namespaces

Preprocessor Directives

Multithreading

Mutex Locks

File I/O

Bit Manipulation

Exception Classes

Template Specialization

Function Pointers

Const Correctness

Type Casting

C++ Interfaces

Heap vs Stack

STL Iterators

Union and Struct

What roles can I use the C++ (Coding): Data Structures & Objects Test for?

Software Engineer
Backend Developer
Systems Programmer
Application Developer
Embedded Systems Engineer
Game Developer
Data Scientist
Machine Learning Engineer
DevOps Engineer
QA Engineer

How is the C++ (Coding): Data Structures & Objects Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Designing complex data structures like trees and graphs.
Optimizing memory management with smart pointers.
Applying advanced algorithms for complex problem-solving.
Customizing STL using functors and iterators.
Managing dynamic binding effectively in polymorphic contexts.
Implementing multi-level inheritance for increased functionality.
Designing abstract base classes and interfaces.
Analyzing and improving algorithmic efficiency.
Integrating advanced templates for type flexibility.
Utilizing memory management tools for detecting leaks.

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Have questions about the C++ (Coding): Data Structures & Objects Hiring Test?

What is C++ (Coding): Data Structures & Objects Test?

The C++ (Coding): Data Structures & Objects Test evaluates a candidate's proficiency in C++ programming focusing on data structures and object-oriented programming. It's used by recruiters to find candidates with strong C++ skills.

Can I combine C++ (Coding): Data Structures & Objects Test with JavaScript & HTML/CSS Test?

Yes, recruiters can request a single custom test with multiple skills in the same test. For instance, you can combine it with the JavaScript & HTML/CSS Test to assess front-end skills.

What kind of questions are used to evaluate senior candidates in the C++ test?

Senior roles are assessed on skills like overloading operators, designing abstract classes, optimizing performance, advanced data structures, and implementing design patterns.

How to use C++ (Coding): Data Structures & Objects Test in my hiring process?

Add this test as a pre-screening tool at the start of recruitment. Include the test link in your job post or directly invite candidates via email.

What are the main C++ tests?

Main C++ tests include:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

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Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

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Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

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