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Grokking the Coding Interview Patterns in C#

The ultimate guide to coding interviews in C#, developed by FAANG engineers. Master essential patterns, tackle tough questions, and prep faster for interviews at top tech companies.

Intermediate

573 Lessons

85h

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The ultimate guide to coding interviews in C#, developed by FAANG engineers. Master essential patterns, tackle tough questions, and prep faster for interviews at top tech companies.

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301 Challenges

301 Quizzes

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Course Overview

Preparing for a coding interview can seem overwhelming, with thousands of potential questions to consider. However, with a strategic approach, your coding interview prep can be completed in just a few weeks. Instead of endlessly drilling practice problems, focus on learning coding interview patterns for more efficient preparation. This course teaches you the underlying patterns behind common coding interview questions. By mastering these essential patterns, you’ll be able to tackle any problem effectively ...Show More

Preparing for a coding interview can seem overwhelming, with thousands of potential questions to consider. However, with a strat...Show More

What You'll Learn

An understanding of essential patterns behind common coding interview questions—without having to drill endless problem sets

Identifying the underlying pattern of each interview question by assessing the problem statement (and learning the tricks required to solve it)

Practicing your skills in a hands-on, setup-free coding environment

Evaluating the tradeoffs between time and space complexity in different solutions efficiently

Developing a flexible conceptual framework for solving any question by connecting problem characteristics, solution techniques, and coding design patterns

An understanding of essential patterns behind common coding interview questions—without having to drill endless problem sets

Course Content

Getting Started

2 Lessons

Get familiar with mastering coding patterns to excel in challenging coding interviews.

Course Overview

Who Should Take This Course

Two Pointers

22 Lessons

Grasp the fundamentals of solving coding problems using the two-pointer technique efficiently.

Introduction to Two Pointers

Valid Palindrome

Solution: Valid Palindrome

3Sum

Solution: 3Sum

Remove Nth Node from End of List

Solution: Remove Nth Node from End of List

Sort Colors

Solution: Sort Colors

Reverse Words in a String

Solution: Reverse Words in a String

Valid Word Abbreviation

Solution: Valid Word Abbreviation

Strobogrammatic Number

Solution: Strobogrammatic Number

Minimum Number of Moves to Make Palindrome

Solution: Minimum Number of Moves to Make Palindrome

Next Palindrome Using Same Digits

Solution: Next Palindrome Using Same Digits

Lowest Common Ancestor of a Binary Tree III

Solution: Lowest Common Ancestor of a Binary Tree III

Valid Palindrome II

Fast and Slow Pointers

17 Lessons

Work your way through the fast and slow pointers method to identify cycles and solve linked list problems.

Introduction to Fast and Slow Pointers

Happy Number

Solution: Happy Number

Linked List Cycle

Solution: Linked List Cycle

Middle of the Linked List

Solution: Middle of the Linked List

Circular Array Loop

Solution: Circular Array Loop

Find the Duplicate Number

Solution: Find the Duplicate Number

Palindrome Linked List

Solution: Palindrome Linked List

Maximum Twin Sum of a Linked List

Solution: Maximum Twin Sum of a Linked List

Split a Circular Linked List

Solution: Split a Circular Linked List

Sliding Window

22 Lessons

Grasp the fundamentals of the sliding window technique for efficient data processing in arrays and strings.

Introduction to Sliding Window

Repeated DNA Sequences

Solution: Repeated DNA Sequences

Sliding Window Maximum

Solution: Sliding Window Maximum

Minimum Window Subsequence

Solution: Minimum Window Subsequence

Longest Repeating Character Replacement

Solution: Longest Repeating Character Replacement

Minimum Window Substring

Solution: Minimum Window Substring

Longest Substring without Repeating Characters

Solution: Longest Substring without Repeating Characters

Minimum Size Subarray Sum

Solution: Minimum Size Subarray Sum

Maximum Average Subarray I

Solution: Maximum Average Subarray I

Diet Plan Performance

Solution: Diet Plan Performance

Fruit Into Baskets

Solution: Fruit Into Baskets

Best Time to Buy and Sell Stock

Merge Intervals

12 Lessons

Map out the steps for merging and inserting intervals, intersections, employee free time, and task scheduling.

Introduction to Merge Intervals

Merge Intervals

Solution: Merge Intervals

Insert Interval

Solution: Insert Interval

Interval List Intersections

Solution: Interval List Intersections

Employee Free Time

Solution: Employee Free Time

Task Scheduler

Solution: Task Scheduler

Meeting Rooms II

In-Place Manipulation of a Linked List

22 Lessons

Focus on efficient in-place linked list manipulations for restructuring, reversing, and swapping nodes with O(n) time and O(1) space complexities.

Introduction to In-Place Manipulation of a Linked List

Reverse Linked List

Solution: Reverse Linked List

Reverse Nodes in k-Group

Solution: Reverse Nodes in k-Group

Reverse Linked List II

Solution: Reverse Linked List II

Reorder List

Solution: Reorder List

Swapping Nodes in a Linked List

Solution: Swapping Nodes in a Linked List

Reverse Nodes in Even Length Groups

Solution: Reverse Nodes in Even Length Groups

Remove Duplicates from Sorted List

Solution: Remove Duplicates from Sorted List

Remove Linked List Elements

Solution: Remove Linked List Elements

Split Linked List in Parts

Solution: Split Linked List in Parts

Delete N Nodes After M Nodes of a Linked List

Solution: Delete N Nodes After M Nodes of a Linked List

Swap Nodes in Pairs

Two Heaps

15 Lessons

Master the two heaps pattern for efficient data processing and solving median, schedule, and interval problems.

Introduction to Two Heaps

IPO

Solution: IPO

Find Median from Data Stream

Solution: Find Median from Data Stream

Sliding Window Median

Solution: Sliding Window Median

Schedule Tasks on Minimum Machines

Solution: Schedule Tasks on Minimum Machines

Meeting Rooms III

Solution: Meeting Rooms III

Largest Number After Digit Swaps by Parity

Solution: Largest Number After Digit Swaps by Parity

Find Right Interval

Solution: Find Right Interval

K-way merge

11 Lessons

Step through merging techniques using the K-way merge algorithm for optimized data integration.

Introduction to K-way Merge

Merge Sorted Array

Solution: Merge Sorted Array

Kth Smallest Number in M Sorted Lists

Solution: Kth Smallest Number in M Sorted Lists

Find K Pairs with Smallest Sums

Solution: Find K Pairs with Smallest Sums

Merge K Sorted Lists

Solution: Merge K Sorted Lists

Kth Smallest Element in a Sorted Matrix

Solution: Kth Smallest Element in a Sorted Matrix

Top K Elements

19 Lessons

Discover techniques to efficiently identify top k elements using heaps in varied scenarios.

Introduction to Top K Elements

Kth Largest Element in a Stream

Solution: Kth Largest Element in a Stream

Reorganize String

Solution: Reorganize String

K Closest Points to Origin

Solution: K Closest Points to Origin

Top K Frequent Elements

Solution: Top K Frequent Elements

Kth Largest Element in an Array

Solution: Kth Largest Element in an Array

Third Maximum Number

Solution: Third Maximum Number

Find Subsequence of Length K with the Largest Sum

Solution: Find Subsequence of Length K with the Largest Sum

Minimum Cost to Hire K Workers

Solution: Minimum Cost to Hire K Workers

Maximal Score After Applying K Operations

Solution: Maximal Score After Applying K Operations

10.

Modified Binary Search

20 Lessons

Master the steps to efficiently apply modified binary search in various complex scenarios.

Introduction to Modified Binary Search

Binary Search

Solution: Binary Search

Search in Rotated Sorted Array

Solution: Search in Rotated Sorted Array

First Bad Version

Solution: First Bad Version

Random Pick with Weight

Solution: Random Pick with Weight

Find K Closest Elements

Solution: Find K Closest Elements

Single Element in a Sorted Array

Solution: Single Element in a Sorted Array

Maximum Value at a Given Index in a Bounded Array

Solution: Maximum Value at a Given Index in a Bounded Array

The K Weakest Rows in a Matrix

Solution: The K Weakest Rows in a Matrix

Count Pairs Whose Sum is Less than Target

Solution: Count Pairs Whose Sum is Less than Target

Search in Rotated Sorted Array II

11.

Subsets

10 Lessons

Enhance your skills in solving subsets, permutations, and combinations problems using C#.

Introduction to Subsets

Subsets

Solution: Subsets

Permutations

Solution: Permutations

Letter Combinations of a Phone Number

Solution: Letter Combinations of a Phone Number

Generate Parentheses

Solution: Generate Parentheses

Find K-Sum Subsets

12.

Greedy Techniques

26 Lessons

Solve problems in optimization using greedy algorithms for efficient, real-world solutions.

Introduction to Greedy Techniques

Jump Game

Solution: Jump Game

Boats to Save People

Solution: Boats to Save People

Gas Station

Solution: Gas Station

Two City Scheduling

Solution: Two City Scheduling

Minimum Number of Refueling Stops

Solution: Minimum Number of Refueling Stops

Largest Palindromic Number

Solution: Largest Palindromic Number

Assign Cookies

Solution: Assign Cookies

Rearranging Fruits

Solution: Rearranging Fruits

Number of Steps to Reduce a Binary Number to One

Solution: Number of Steps to Reduce a Binary Number to One

Maximum Swap

Solution: Maximum Swap

Can Place Flowers

Solution: Can Place Flowers

Largest Odd Number in String

Solution: Largest Odd Number in String

Jump Game II

13.

Backtracking

21 Lessons

Follow the process of using backtracking to solve complex problems efficiently, such as N-Queens, Word Search, and Sudoku Solver.

Introduction to Backtracking

N-Queens

Solution: N-Queens

Word Search

Solution: Word Search

House Robber III

Solution: House Robber III

Restore IP Addresses

Solution: Restore IP Addresses

Flood Fill

Solution: Flood Fill

Minimum Moves to Spread Stones Over Grid

Solution: Minimum Moves to Spread Stones Over Grid

Binary Tree Paths

Solution: Binary Tree Paths

Binary Watch

Solution: Binary Watch

Optimal Account Balancing

Solution: Optimal Account Balancing

Sudoku Solver

Matchsticks to Square

14.

Dynamic Programming

32 Lessons

Practice using dynamic programming to efficiently solve optimization problems by leveraging subproblem solutions.

Introduction to Dynamic Programming

0/1 Knapsack

Solution: 0/1 Knapsack

Coin Change

Solution: Coin Change

N-th Tribonacci Number

Solution: N-th Tribonacci Number

Partition Equal Subset Sum

Solution: Partition Equal Subset Sum

Counting Bits

Solution: Counting Bits

01 Matrix

Solution: 01 Matrix

House Robber II

Solution: House Robber II

Maximum Product Subarray

Solution: Maximum Product Subarray

Combination Sum

Solution: Combination Sum

Word Break

Solution: Word Break

Palindromic Substrings

Solution: Palindromic Substrings

Longest Common Subsequence

Solution: Longest Common Subsequence

Word Break II

Solution: Word Break II

Decode Ways

Solution: Decode Ways

Count the Number of Good Subsequences

Solution: Count the Number of Good Subsequences

Climbing Stairs

15.

Cyclic Sort

8 Lessons

Break down and optimize sorting and missing number problems using cyclic sort techniques.

Introduction to Cyclic Sort

Missing Number

Solution: Missing Number

First Missing Positive

Solution: First Missing Positive

Find the Corrupt Pair

Solution: Find the Corrupt Pair

Find the First K Missing Positive Numbers

16.

Topological Sort

16 Lessons

Discover the logic behind topological sorting, compilation order, alien dictionaries, course schedules, matrix construction, paths, and recipe dependencies.

Introduction to Topological Sort

Compilation Order

Solution: Compilation Order

Alien Dictionary

Solution: Alien Dictionary

Verifying an Alien Dictionary

Solution: Verifying an Alien Dictionary

Course Schedule II

Solution: Course Schedule II

Course Schedule

Solution: Course Schedule

Build a Matrix with Conditions

Solution: Build a Matrix with Conditions

Longest Path With Different Adjacent Characters

Solution: Longest Path With Different Adjacent Characters

Find All Possible Recipes from Given Supplies

17.

Matrices

23 Lessons

Examine matrix operations, including traversal methods, transformations, and problem-solving in image processing and data analysis.

Introduction to Matrices

Set Matrix Zeroes

Solution: Set Matrix Zeroes

Rotate Image

Solution: Rotate Image

Spiral Matrix

Solution: Spiral Matrix

Where Will the Ball Fall

Solution: Where Will the Ball Fall

Transpose Matrix

Solution: Transpose Matrix

Count Negative Numbers in a Sorted Matrix

Solution: Count Negative Numbers in a Sorted Matrix

Minimum Time Takes to Reach Destination Without Drowning

Solution:Minimum Time Takes to Reach Destination Without Drowning

Smallest Rectangle Enclosing Black Pixels

Solution: Smallest Rectangle Enclosing Black Pixels

Island Perimeter

Solution: Island Perimeter

Convert 1D Array Into 2D Array

Solution: Convert 1D Array Into 2D Array

Spiral Matrix II

Solution: Spiral Matrix II

18.

Stacks

20 Lessons

Apply your skills to implement efficient stack-based solutions for various coding challenges.

Introduction to Stacks

Basic Calculator

Solution: Basic Calculator

Remove All Adjacent Duplicates In String

Solution: Remove All Adjacent Duplicates In String

Minimum Remove to Make Valid Parentheses

Solution: Minimum Remove to Make Valid Parentheses

Exclusive Time of Functions

Solution: Exclusive Time of Functions

Flatten Nested List Iterator

Solution: Flatten Nested List Iterator

Implement Queue Using Stacks

Solution: Implement Queue Using Stacks

Daily Temperatures

Solution: Daily Temperatures

Decode String

Solution: Decode String

Minimum String Length After Removing Substrings

Solution: Minimum String Length After Removing Substrings

Valid Parentheses

19.

Graphs

19 Lessons

Explore various graph types, their applications, and efficient algorithms for solving problems.

Introduction to Graphs

Network Delay Time

Solution: Network Delay Time

Paths in Maze That Lead to Same Room

Solution: Paths in Maze That Lead to Same Room

Clone Graph

Solution: Clone Graph

Graph Valid Tree

Solution: Graph Valid Tree

Bus Routes

Solution: Bus Routes

Reconstruct Itinerary

Solution: Reconstruct Itinerary

Find the Town Judge

Solution: Find the Town Judge

Find Center of Star Graph

Solution: Find Center of Star Graph

Lucky Numbers in a Matrix

Solution: Lucky Numbers in a Matrix

20.

Tree Depth-First Search

31 Lessons

Follow the process of solving various binary tree problems using depth-first search and traversal methods.

Introduction to Tree Depth-First Search

Flatten Binary Tree to Linked List

Solution: Flatten Binary Tree to Linked List

Diameter of Binary Tree

Solution: Diameter of Binary Tree

Serialize and Deserialize Binary Tree

Solution: Serialize and Deserialize Binary Tree

Invert Binary Tree

Solution: Invert Binary Tree

Binary Tree Maximum Path Sum

Solution: Binary Tree Maximum Path Sum

Convert Sorted Array to Binary Search Tree

Solution: Convert Sorted Array to Binary Search Tree

Build Binary Tree from Preorder and Inorder Traversal

Solution: Build Binary Tree from Preorder and Inorder Traversal

Binary Tree Right Side View

Solution: Binary Tree Right Side View

Lowest Common Ancestor of a Binary Tree

Solution: Lowest Common Ancestor of a Binary Tree

Validate Binary Search Tree

Solution: Validate Binary Search Tree

Nested List Weight Sum II

Solution: Nested List Weight Sum II

Inorder Successor in BST

Solution: Inorder Successor in BST

Height of Binary Tree After Subtree Removal Queries

Solution: Height of Binary Tree After Subtree Removal Queries

Delete Nodes And Return Forest

Solution: Delete Nodes And Return Forest

Maximum Depth of Binary Tree

Kth Smallest Element in a BST

21.

Tree Breadth-First Search

16 Lessons

Master tree traversal techniques, utilizing breadth-first searches for optimized node exploration and connectivity.

Introduction to Tree Breadth-First Search

Binary Tree Level Order Traversal

Solution: Binary Tree Level Order Traversal

Binary Tree Zigzag Level Order Traversal

Solution: Binary Tree Zigzag Level Order Traversal

Populating Next Right Pointers in Each Node

Solution: Populating Next Right Pointers in Each Node

Vertical Order Traversal of a Binary Tree

Solution: Vertical Order Traversal of a Binary Tree

Symmetric Tree

Solution: Symmetric Tree

Word Ladder

Solution: Word Ladder

Two Sum IV – Input Is a BST

Solution: Two Sum IV – Input Is a BST

Connect All Siblings of a Binary Tree

22.

Trie

18 Lessons

Step through implementing and utilizing trie structures for efficient string operations and searches.

Introduction to Trie

Implement Trie (Prefix Tree)

Solution: Implement Trie (Prefix Tree)

Search Suggestions System

Solution: Search Suggestions System

Replace Words

Solution: Replace Words

Design Add and Search Words Data Structure

Solution: Design Add and Search Words Data Structure

Word Search II

Solution: Word Search II

Top K Frequent Words

Solution: Top K Frequent Words

Longest Common Prefix

Solution: Longest Common Prefix

Index Pairs of a String

Solution: Index Pairs of a String

Lexicographical Numbers

23.

Hash Maps

32 Lessons

Get started with understanding and implementing hash maps, their design, and practical applications in coding challenges.

Introduction to Hash Maps

Design HashMap

Solution: Design HashMap

Fraction to Recurring Decimal

Solution: Fraction to Recurring Decimal

Logger Rate Limiter

Solution: Logger Rate Limiter

Next Greater Element I

Solution: Next Greater Element I

Isomorphic Strings

Solution: Isomorphic Strings

Find Duplicate File in System

Solution: Find Duplicate File in System

Dot Product of Two Sparse Vectors

Solution: Dot Product of Two Sparse Vectors

High Five

Solution: High Five

Bulls and Cows

Solution: Bulls and Cows

Custom Sort String

Solution: Custom Sort String

Number of Distinct Islands

Solution: Number of Distinct Islands

Number of Wonderful Substrings

Solution: Number of Wonderful Substrings

Total Appeal of a String

Solution: Total Appeal of a String

Continuous Subarray Sum

Solution: Continuous Subarray Sum

Unique Number of Occurrences

Solution: Unique Number of Occurrences

Longest Palindrome

24.

Knowing What to Track

24 Lessons

Explore techniques for tracking data occurrences to solve complex coding problems in C#.

Introduction to Knowing What to Track

Palindrome Permutation

Solution: Palindrome Permutation

Valid Anagram

Solution: Valid Anagram

Design Tic-Tac-Toe

Solution: Design Tic-Tac-Toe

Group Anagrams

Solution: Group Anagrams

Maximum Frequency Stack

Solution: Maximum Frequency Stack

First Unique Character in a String

Solution: First Unique Character in a String

Find All Anagrams in a String

Solution: Find All Anagrams in a String

Longest Palindrome by Concatenating Two-Letter Words

Solution: Longest Palindrome by Concatenating Two-Letter Words

Rank Teams by Votes

Solution: Rank Teams by Votes

Pairs of Songs With Total Durations Divisible by 60

Solution: Pairs of Songs With Total Durations Divisible by 60

Minimum Number of Pushes to Type Word II

Solution: Minimum Number of Pushes to Type Word II

Ransom Note

25.

Union Find

22 Lessons

Apply your skills to using the union-find algorithm for various graph and connectivity problems.

Introduction to Union Find

Redundant Connection

Solution: Redundant Connection

Number of Islands

Solution: Number of Islands

Most Stones Removed with Same Row or Column

Solution: Most Stones Removed with Same Row or Column

Longest Consecutive Sequence

Solution: Longest Consecutive Sequence

Last Day Where You Can Still Cross

Solution: Last Day Where You Can Still Cross

Regions Cut by Slashes

Solution: Regions Cut by Slashes

Accounts Merge

Solution: Accounts Merge

Minimize Malware Spread

Solution: Minimize Malware Spread

Find if Path Exists in Graph

Solution: Find if Path Exists in Graph

The Skyline Problem

Solution: The Skyline Problem

Evaluate Division

26.

Custom Data Structures

26 Lessons

Deepen your knowledge of designing efficient custom data structures for complex problem-solving.

Introduction to Custom Data Structures

Snapshot Array

Solution: Snapshot Array

Time Based Key-Value Store

Solution: Time Based Key-Value Store

LRU Cache

Solution: LRU Cache

Insert Delete GetRandom O(1)

Solution: Insert Delete GetRandom O(1)

Min Stack

Solution: Min Stack

Range Module

Solution: Range Module

Shortest Word Distance II

Solution: Shortest Word Distance II

Design HashSet

Solution: Design HashSet

Max Stack

Solution: Max Stack

Moving Average from Data Stream

Solution: Moving Average from Data Stream

Two Sum III - Data structure design

Solution: Two Sum III - Data structure design

Range Sum Query - Immutable

Solution: Range Sum Query - Immutable

LFU Cache

27.

Bitwise Manipulation

26 Lessons

Focus on bitwise manipulation for practical applications like cryptography, image processing, and unique element identification.

Introduction to Bitwise Manipulation

Find the Difference

Solution: Find the Difference

Complement of Base 10 Integer

Solution: Complement of Base 10 Integer

Flipping an Image

Solution: Flipping an Image

Single Number

Solution: Single Number

Single Number II

Solution: Single Number II

Encode and Decode Strings

Solution: Encode and Decode Strings

Sum of All Subset XOR Totals

Solution: Sum of All Subset XOR Totals

Find The K-th Lucky Number

Solution: Find The K-th Lucky Number

Minimum Number of K Consecutive Bit Flips

Solution: Minimum Number of K Consecutive Bit Flips

Find the Longest Substring Having Vowels in Even Counts

Solution: Find the Longest Substring Having Vowels in Even Counts

Count Triplets That Can Form Two Arrays of Equal XOR

Solution: Count Triplets That Can Form Two Arrays of Equal XOR

Longest Subarray With Maximum Bitwise AND

Solution: Longest Subarray With Maximum Bitwise AND

Reverse Bits

28.

Challenge Yourself

40 Lessons

Test your understanding of various coding problems to improve interview readiness.

Challenge Yourself: Introduction

Shortest Bridge

Number of Connected Components in an Undirected Graph

Median of Two Sorted Arrays

Pacific Atlantic Water Flow

Contains Duplicate

Maximum Subarray

Two Sum

Find Minimum in Rotated Sorted Array

Non-overlapping Intervals

Meeting Rooms

Largest Rectangle in Histogram

Subtree of Another Tree

Sort List

Number of 1 Bits

Container with Most Water

Evaluate Reverse Polish Notation

4Sum

Loud and Rich

Product of Array Except Self

Longest Increasing Subsequence

Sum of Two Integers

Majority Element

Unique Paths

Longest Palindromic Substring

Permutations II

Number of Provinces

Linked List Cycle II

Minimum Flips to Make the Binary String Alternate

Lemonade Change

House Robber

Find All Numbers Disappeared in an Array

Find All Duplicates in an Array

Same Tree

Design In-Memory File System

29.

Conclusion

1 Lessons

Get familiar with next steps to enhance coding interview preparation and seek support.

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Frequently Asked Questions

Is C# good for coding interviews?

Yes, C# is suitable for coding interviews. It offers extensive features, including various data structures, strong typing, and powerful libraries, which are useful for solving various coding problems. Its object-oriented design and extensive .NET framework support make it a good choice for demonstrating problem-solving skills and writing efficient, maintainable code in technical interviews. Its similarity with Java makes it even more popular.

How to prepare for a C# Coding interview?

To prepare for a C# coding interview, focus on mastering core concepts such as data structures (arrays, lists, dictionaries), algorithms (sorting, searching), and object-oriented programming (classes, inheritance). Practice coding problems on platforms like Educative, LeetCode, and HackerRank to apply these concepts and become familiar with specific features in C# like LINQ and async/await.

Can I use C# in the Google interview?

Yes, you can use C# in a Google interview. Google allows a range of programming languages for coding challenges, and C# is a viable option, especially if you are comfortable with its syntax and features. Make sure to demonstrate your problem-solving skills and coding proficiency properly. Study and practice Grokking Coding Interview Patterns in the C# course by Educative.

How to crack coding interviews easily?

To crack coding interviews easily, focus on mastering the basics, practicing regularly, learning common patterns, doing mock interviews, reviewing and reflecting, and communicating clearly. Educative offers Grokking Coding Interview Patterns in six languages and AI mock interviewers to help you crack the coding interviews easily.

Can I practice coding in grokking the coding interview C# course?

Yes, you can practice coding in Grokking the Coding Interview with C#. Educative offers 228 coding problems categorized by patterns to help you prepare thoroughly.