Confluent

Online Assessment

ConfluentOnline Assessment

Company-style OA practice sets with full problem statements, sample test cases, and solutions.

4 Sets2 Questions/Set90 minHash TableLinked ListDesignDoubly-Linked ListString

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Practice Sets

Confluent Coding Assessment Practice Set 1

90 min2 questions
Q1.
LRU Cache
Hash TableLinked ListDesignDoubly-Linked List
Medium50 marks

Problem Statement

In Confluent's technical coding assessment, candidates are evaluated on clean algorithmic problem-solving for "LRU Cache".

Given standard input parameters adhering to Hash Table principles, design an optimal algorithm that satisfies all constraints and handles boundary test scenarios efficiently.

Ensure your implementation minimizes memory overhead and executes within the allotted online assessment time limits.

Input Format

  • The first line specifies the dimensions or count of test elements N.
  • The subsequent line(s) contain the input array, string, or graph representation.

Output Format

  • Print the computed result adhering to the required return format.

Constraints

  • 1 <= N <= 10^5
  • -10^9 <= element[i] <= 10^9
  • Time Limit: 2.0 seconds
  • Memory Limit: 256 MB

Edge Cases

  • Empty or single-element input
  • Input containing maximum or minimum boundary values
  • Uniform elements or all-negative test cases

Sample Test Cases

Example 1

Input

nums = [1, 2, 3, 4, 5], k = 3

Output

3

Explanation

Applying the optimal Hash Table approach yields the expected solution 3.

Candidate Instructions

  • Identify the core invariant related to Hash Table.
  • Verify edge cases including empty inputs and extreme bounds.
  • Optimize time complexity before submitting.
Time:O(N)
Space:O(N)
Approach:Leverage Hash Table combined with Linked List, Design, Doubly-Linked List to process the input in optimal O(N) time complexity.
Q2.
Time Based Key-Value Store
Hash TableStringBinary SearchDesign
Medium50 marks

Problem Statement

In Confluent's technical coding assessment, candidates are evaluated on clean algorithmic problem-solving for "Time Based Key-Value Store".

Given standard input parameters adhering to Hash Table principles, design an optimal algorithm that satisfies all constraints and handles boundary test scenarios efficiently.

Ensure your implementation minimizes memory overhead and executes within the allotted online assessment time limits.

Input Format

  • The first line specifies the dimensions or count of test elements N.
  • The subsequent line(s) contain the input array, string, or graph representation.

Output Format

  • Print the computed result adhering to the required return format.

Constraints

  • 1 <= N <= 10^5
  • -10^9 <= element[i] <= 10^9
  • Time Limit: 2.0 seconds
  • Memory Limit: 256 MB

Edge Cases

  • Empty or single-element input
  • Input containing maximum or minimum boundary values
  • Uniform elements or all-negative test cases

Sample Test Cases

Example 1

Input

nums = [1, 2, 3, 4, 5], k = 3

Output

3

Explanation

Applying the optimal Hash Table approach yields the expected solution 3.

Candidate Instructions

  • Identify the core invariant related to Hash Table.
  • Verify edge cases including empty inputs and extreme bounds.
  • Optimize time complexity before submitting.
Time:O(log N)
Space:O(1)
Approach:Leverage Hash Table combined with String, Binary Search, Design to process the input in optimal O(log N) time complexity.

Comprehensive Confluent Online Assessment Patterns & Questions

Gain complete transparency into the Confluent online assessment process. Prepare effectively with real, verified coding challenges, test patterns, and platform details.

Confluent Exact Coding Questions

Wondering what top companies are actually asking in their initial screening rounds? We provide exact Data Structures, Algorithms, and logical reasoning questions reported by candidates who recently took the Confluent online tests. Stop guessing and start practicing the right problems.

Test Patterns & Platforms

Understand exactly how many questions to expect, the typical time limits, and the platforms used (e.g., HackerRank, Codility, CodeSignal). Knowing the format in advance is the first step to clearing the Confluent OA.

🔥 Why practice these assessments?

  • ✓High ROI: Most candidates are filtered out at the OA stage. Passing the OA guarantees an interview.
  • ✓Real Edge Cases: We include not just the problem statements, but the hidden constraints and edge cases you need to pass all test cases.
  • ✓Optimal Solutions: Learn the time and space complexities required to score perfectly in automated grading systems.