C# Algorithms Online Test

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The C# Algorithms online test assesses candidates' algorithmic-thinking skills and their ability to implement algorithms using C#.

It's an ideal test for pre-employment screening. A good developer will be able to design and implement algorithms that are both correct and efficient. Computational complexity is important not only when scaling applications but when creating responsive, maintainable, and efficient code.

This online test requires candidates to analyze or design an algorithm using C# as the programming language.

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Sample Free Questions

Binary Search Tree

15min
  -  
Easy  
  -  
CODE

C# Algorithmic thinking Data structures Public

A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to Contains(n2, 3) should return true since a tree with root at n2 contains number 3.

Two Sum

30min
  -  
Easy  
  -  
CODE

C# Algorithmic thinking Searching Public

Write a function that, when passed a list and a target sum, returns, efficiently with respect to time used, two distinct zero-based indices of any two of the numbers, whose sum is equal to the target sum. If there are no two numbers, the function should return null.

For example, FindTwoSum(new List<int>() { 3, 1, 5, 7, 5, 9 }, 10) should return a Tuple<int, int> containing any of the following pairs of indices:

  • 0 and 3 (or 3 and 0) as 3 + 7 = 10
  • 1 and 5 (or 5 and 1) as 1 + 9 = 10
  • 2 and 4 (or 4 and 2) as 5 + 5 = 10

Sorted Search

20min
  -  
Hard  
  -  
CODE

C# Algorithmic thinking Searching Public

Implement function CountNumbers that accepts a sorted array of unique integers and, efficiently with respect to time used, counts the number of array elements that are less than the parameter lessThan.

For example, SortedSearch.CountNumbers(new int[] { 1, 3, 5, 7 }, 4) should return 2 because there are two array elements less than 4.

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Prefix, Bicycle, Classroom, Runner, Disposable Wrapper, Read Write Execute, Needle, Log Parser, Driver Exam, Vectors, Crop Ratio, Weighted Average, Chicken, Racer, Paragraph, Username, Chain Link, Hobbies, Sort Params, Node, Programmer Teacher, Read First Line, Stack to List, Product Refactoring, Snapshot, Date Transform, Shining Star, Document Store, Procedural Generator, Document Counter, Adder, Shelf, Internal Nodes, Movie Night, Window Manager, Moving Total, Entry, Unique Numbers, Rare, Paper Strip, Max Sum, Friend, Remove Repetitions, Unique Name, Log Patch, Stories, Train, Platformer, Shipping, Segment, Eye of the Storm, Chinese Box
Skills
C# LINQ Language Bug fixing Memory management OOP Arithmetic Strings Stream Serialization Exceptions Searching Multithreading Data structures Arrays Iteration Algorithmic thinking Refactoring TDD Random Test case design Sorting Graphs Extension Methods Dynamic programming
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