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Data Structures Online Test

The Data Structures Test is preferred by recruiters to assess on-the-job skills of candidates before an interview. It reduces technical screening time by 80% by enabling employers to identify qualified candidates.

Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

Covered Topics:

Computer fundamentals
Stacks
Queues
Trees
Graphs
Linked Lists
Hash maps
Sorting Algorithms
See full list
Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


Human Resources Manager

Singapore Government

85%
reduction in screening time

Sample Data Structures Online Test Questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this Data Structures Test will be non-googleable.

🧐 Question🔧 Skill💪 Difficulty⌛ Time
Decryptor
What does the following pseudo code print?
 image

Options:

  • cfw k
  • abcde
  • abc e
  • aaaaaa
  • aaa a
  • cfwk
  • cfxl
  • c f x . l
Strings
Technical AptitudeMedium2 min
Fibonacci codes
Here are three pseudocodes for calculating the Nth Fibonacci number. Which of the following statements about these codes are true?
 image
A: Time complexity/efficiency of CODE 1, CODE 2, CODE 3 is the same.
B: CODE 2 is more space-efficient than CODE 3.
C: CODE 3 is more space-efficient than CODE 2.
D: CODE 2 is more time-efficient than CODE 1.
E: CODE 3 is more time-efficient than CODE 1.

Options:

  • B D
  • B E
  • C D
  • C E
  • A B D
  • A B E
  • A C D
  • A C E
  • B D E
  • C D E
  • A B D E
  • A C D E
  • A B C D E
Time Complexity Pseudo Code
Technical AptitudeMedium2 min
Palindrome Test cases
Go through the following faulty palindrome detection pseudocode and test cases. For which of the test cases would the code return true?
 image
Testcases
A: a
B: aba
C: aaa
D: aac

Options:

  • A
  • B
  • C
  • D
  • A B
  • A C
  • A D
  • B C
  • B D
  • C D
  • A B C
  • B C D
  • A C D
  • A B D
  • A B C D
Strings
Technical AptitudeMedium2 min
Rewards Activities Order
A new popular app tracks the activities performed by its users and grants them rewards based on each individual's total activities performed in a year. This data is maintained in a database table (activitesinfo), with the following columns: userid, totalactivities, reward. This year, due to fundraising activity, the company has decided to further reward its users by enhancing the reward as per the following formula: If reward < = 4000, increase it by 2%, If 4000 < reward <= 8000, increase it by 4%, If reward > 8000, increase it by 6%.
The tech team has written three different scripts to calculate increment for each slab, each script is to run as a separate transaction. Here are the three scripts:
Script 1:
For users with reward <= 4000, set reward = reward * 1.02

Script 2:
For users with reward > 4000 and reward <= 8000, set reward = reward * 1.04

Script 3:
For users with reward > 8000, set reward = reward * 1.06
Each script is to be executed separately. Which of the following options will update the rewards as expected:
A: Execute Script 1 followed by Script 2 followed by Script 3
B: Execute Script 2 followed by Script 3; Script 1 running concurrently throughout
C: Execute Script 3 followed by Script 2; Script 1 running concurrently throughout
D: Execute Script 3 followed by Script 2 followed by Script 1
E: Execute Script 2 followed by Script 3 followed by Script 1

Options:

  • A
  • B
  • C
  • D
  • E
Database Connection
Technical AptitudeMedium3 min

How to use the Adaface Data Structures Online Test

Start screening candidates within minutes with the ready-to-go Data Structures Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

Customize the Adaface Data Structures Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface Data Structures Test is trusted by enterprises worldwide

amazon
PayPal
Morgan Stanley
Adidas
SG Government
Neilsen
UCLA
Ernst and Young
Microsoft
WeWork
Bosch
Optimum Solutions
SAP
Doubtnut
Deloitte
HCL
FusionCharts
United Nations
Sokrati
Love Bonito
ZiMetrics
MTM

About the Adaface Data Structures Assessment Test

Evaluate data structures technical and coding skills with Adaface skills assessment platform powered by an intelligent chatbot.

Topics:

Linear Data Structures
Circular Singly Linked List Insertion
Special Stack Data Structure
Binary Search Tree
Fibonacci Heap
Separate Chaining For Collision Handling
Self Organizing List
Binary Indexed Tree
Kasai’s Algorithm
LRU Cache
Cartesian Tree
Strassen’s Matrix Multiplication
Singly Linked List
Doubly Linked List
Queue
Handshaking Lemma
Order Statistics In BST
Heap Sort
Open Addressing For Collision Handling
Unrolled Linked List
Two Dimensional Binary Indexed Tree Or Fenwick Tree
Ukkonen’s Suffix Tree
Decision Trees
Gomory-Hu Tree
Expression Tree
Linked List Insertion
The Great Tree-List Recursion
Priority Queue
BFS Vs DFS For Binary Tree
Binary Heap
Tournament Tree (Winner Tree)
Graph, Directed Graph, Undirected Graph, And Directed Acyclic Graph
Segment Tree And Persistent Segment Tree
Suffix Array And Suffix Tree
Avl Tree, Splay Tree, B Tree, Red-Black Tree, And K Dimensional Tree
Spaghetti Stack
Tree Traversal
Circular Linked List
Stack
Deque
Threaded Binary Tree
Binomial Heap
Hashing
Skip List
Suffix Array Nlogn Algorithm
Ternary Search Tree
Treap
Matrix
B+ Tree

Recommended Roles:

Computer Programmer
Software Engineer
Software Developer
Data Analyst
Application Engineer
Java Developer- Data Structure
Python Developer- Data Structure
Graph Engineer- Data Structure/ Algorithm
Algorithms Specialist

Why You Should Use This Data Structures Online Test

The Data Structures 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.

The Adaface Data Structures Online Test screens candidates for the typical skills recruiters look for Software Engineer roles:

  • Knowledge of core data structures like the Stack, Queues, Trees, Graphs, LinkedList, Hash Maps
  • Understanding of OOPs fundamentals
  • Proficiency in developing systems and applications using appropriate data structures
  • Experience with various sorting algorithms (bubble sort, merge sort, shell sort, etc.)

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for Software Engineer roles. Anti-cheating features enable you to be comfortable with conducting assessments online. The Data Structures Online Test is ideal for helping recruiters identify which candidates have the skills to do well on the job.

About Software Engineer Roles

A data structure is a particular way of storing data in a computer that allows one to make efficient use of it. In one way or another, most commercial systems use different types of data structures.

Data structures are a type of data organization, maintenance, and storage format that aids many organizations in accessing and changing data efficiently. It is also the foundation for an abstract data form (ADT). Data structures are a set of algorithms that can be used in any programming language to organize data in memory.

Typical Software Engineer responsibilities include:

  • Designing, developing, and managing high-volume, low-latency software programs
  • Analyzing user requirements to inform application design
  • Defining application objectives and functionality by working closely with other development teams, UX designers, business and systems analysts
  • Supporting users by developing documentation and assistance tools
  • Implementing quality assurance procedures

Distribution Of Test Scores

The actual score distribution will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.

OLD WAY

TRADITIONAL TESTS

Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments

😞
HIRE IN
Weeks/Months

NEW WAY

ADAFACE ASSESSMENTS

Questions for on-the-job skills

Conversational

Customized
assessments

😀️
HIRE IN
Days

FAQs

What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • Secure browser

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.

What experience level can I use this test for?

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.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

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