Leetcode in C# : Algorithms Coding Interview Questions

سرفصل های دوره

Practice data structure and algorithms questions for interviews at FAANG companies like Google, Facebook, Apple & Amazon

1. Introduction

1. What to do if you dont understand an explanation or a code video.html

2. Utilise the video format of online courses.html

2. Microsoft Array Question Container with most water (Medium)

1. Introduction to the problem

2. Brute force solution

3. pseudocode walkthrough

4. Better Approach intuition

5. Approach 2 Pseudocode walkthrough

6. Implementing the code

3. Google Array Question Valid mountain array (Easy)

1. Introduction to the problem

2. How to think about this problem

3. Pseudocode Walkthrough

4. Implementing the code

4. Google Array Question Boats to save people (Medium)

1. Problem Introduction

2. How to intuitively think about this problem

3. Pseudocode Walkthrough

4. Implementing the code

5. Facebook Array Question Move Zeroes (Easy)

1. Brute force Intuition

2. Brute force pseudocode walkthrough

3. Better Approach Intuition

4. Better Approach Pseudocode walkthrough

5. Implementing the code

6. Amazon Array Question Longest substring without repeating characters (Medium)

1. Introduction to the problem

2. Brute Force Intuition

3. Pseudocode walkthrough

4. Approach 2 Intuition

5. Approach 2 pseudocode walkthrough

6. Implementing the code

7. Arrays QuestionFind first and last position of element in sorted Array (Medium)

1. Introduction to the problem and brute force approach

2. Brute force Pseudocode walkthrough

3. Approach 2 Optimal Approach intuition

4. Pseudocode walkthrough part 1

5. Pseudocode walkthrough part 2

6. Implementing the code

8. Google Array question first bad version (Easy)

1. Introduction To The Problem And Brute Force Approach

2. Optimal Solution Intuition

3. Optimal solution pseudocode walkthrough

4. Implementing the code

9. Microsoft Math Question Missing Number (Easy-ish)

1. Introduction to the problem

2. Approach 1 Brute Force Approach

3. Approach 2 A Better Approach Explanation

4. PseudoCode Walkthrough For Approach 2

5. Implementing the code

6. Approach 3 Optimal Approach

7. Implementing the optimal approach

10. Amazon Math Question Count Primes

1. Problem Introduction And Brute Force Explanation

2. Pseudocode Walkthrough For Brute Force Approach

3. Approach 2 Optimal solution

4. Pseudocode Walkthrough For Optimal Approach

5. Code Implementation

11. Airbnb Math Question Single Number

1. Introduction to the problem and brute force approach

2. Pseudocode walkthrough for brute approach

3. Approach 2 better Approach

4. Implementing the code

5. Approach 3 optimal approach

6. Implementing the optimal approach

12. Amazon Math Question Robot return to origin (Easy)

1. Explaining the problem

2. Implementing the code

13. Facebook Math Question Add Binary (Easy)

1. Introduction to the problem

2. Examples of binary additions

3. Pseudocode Implementation

4. Pseudocode Walkthrough

5. Implementing the code

14. Google Hash Tables Dictionaries question Two Sum (Easy)

1. Approach 1 Introduction to the problem and brute force approach

2. Brute force Pseudocode Implementation

3. Pseudocode Walkthrough

4. Approach 2 Optimal Approach Explanation

5. Pseudocode Walkthrough

6. Code Implementation

15. Google Hash Tables Dictionaries question Contains Duplicate

1. Introduction to the problem and multiple approaches

2. Optimal Approach

3. Code Implementation

16. Google Hash Tables Dictionaries question Majority Element

1. Approach 1 Intuition

2. Approach 1 Pseudocode Walkthrough

3. Approach 2 - Majority Element Intuition

4. Implementing Approach 2 code

5. Approach 3 Intuition - Optimal solution

6. Approach 3 Walkthrough - Optimal solution

7. Implementing Approach 3 (optimal approach)

17. Hash Tables Dictionaries question 4sum 2 (Medium)

1. Brute force Explanation

2. Brute Force Pseudocode Walkthrough

3. Approach 2 Optimal approach

4. Implementing the code

18. Linkedin Hash Tables Dictionaries question Minimum Window Substring (Hard)

1. Explanation - Minimum Window Substring - part 1

2. Explanation - Minimum window substring - part 2

3. Explanation - Minimum window substring - part 3

4. Pseudocode Implementation

5. Pseudocode Walkthrough

6. Code Implementation - Minimum Window Substring

19. Facebook Hash Tables Dictionaries question Group Anagrams (Medium)

1. Explanation - Group Anagrams - Medium #49

2. Coding the implementation

20. Microsoft Hash Tables Dictionaries question LRU Cache (Medium)

1. Introduction to the problem

2. InputOutput for the problem

3. Intuition behind the problem

4. Pseudocode implementation

5. Pseudocode Walkthrough

21. Apple Linked list question Merge Two Sorted Lists (Easy)

1. Explanation - Merge Two Sorted Lists - Easy #21

2. Pseudocode Implementation - Merge Two Sorted Lists - Easy #21

3. Walkthrough - Merge Two Sorted Lists - Easy #21

4. Code - Merge Two Sorted Lists - Easy #21

22. Amazon Linked list question Linked list cycle (Medium)

1. Explanation - Linked List Cycle - Easy #141

2. Intuition - Linked List Cycle - Easy #141

3. Walkthrough - Linked List Cycle - Easy #141

4. Code - Linked List Cycle - Easy #141

23. Microsoft Linked list question Reverse linked list (Medium)

1. Explanation - Reverse Linked List

2. Intuition - Reverse Linked List

3. pseudocode Implementation & Walkthrough - Reverse Linked List

4. Implementing the code - Reverse Linked List

24. Adobe Linked list question Add two numbers (Medium)

1. Explanation - Add Two Numbers

2. Intuition - Add Two Numbers

3. Pseudocode Implementation - Add Two Numbers

4. Walkthrough - Add Two Numbers

5. Code - Add Two Numbers

25. Linked list question Remove Nth node from end of list (Medium)

1. Explanation - Remove Nth Node From End of List

2. Intuition - Remove Nth Node From End of List

3. Walkthrough - Remove Nth Node From End of List

4. Approach 2 Explanation - Remove Nth Node From End of List

5. Approach 2 Walkthrough - Remove Nth Node From End of List

6. Code - Remove Nth Node From End of List

26. Linked list question Odd Even linked list (Medium)

1. Explanation - Odd Even Linked List

2. Intuition - Odd Even Linked List

3. Implementation - Odd Even Linked List

4. Walkthrough - Odd Even Linked List

5. Code - Odd Even Linked List

27. Facebook Backtracking question Subsets (Medium)

1. Explanation - Subsets

2. Cascading solution explanation - Subsets

3. Cascading solution walkthrough - Subsets

4. Backtracking Approach 2 explanation - Subsets

5. Implementing the code

28. Amazon Backtracking question Letter Combination of a Phone Number (Medium)

1. Explanation - Letter Combinations of a Phone Number

2. Intuition - Letter Combinations of a Phone Number

3. Walkthrough - Letter Combinations of a Phone Number

4. Code - Letter Combinations of a Phone Number

29. Microsoft Backtracking question Word Search (Medium)

1. Problem Explanation and intuition

30. Uber Backtracking question Combination Sum (Medium)

1. Explanation the problem

2. Intuition behind the problem

3. Walkthrough over the pseudocode

4. Implementing the code

31. Bloomberg Backtracking question Palindrome Partitioning (Medium)

1. Intuition behind the problem

2. Pseudocode implementation

3. Walkthrough over pseudocode

4. Implementing the code

32. Microsoft Trees question Symmetric Trees (Easy)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Implementing the code

33. Google Trees question Maximum Depth of a Binary Tree (Easy)

1. Explaining the problem

2. Intuition and pseudocode implementation

3. Walkthrough over pseudocode

4. Implementing the real code

34. Amazon Trees question Path Sum (Easy)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Coding the solution

35. Facebook Trees question Lowest Common Ancestor of a Binary Tree (Medium)

1. Explaining the problem

2. Intuition behind the problem

3. Pseudocode implementation

4. Walkthrough over pseudocode

5. Code Lowest common ancestor of a binary tree

36. Google Trees question Kth Smallest Element In a BST (Medium)

1. Explaining the problem and brute force approach

2. Optimised Solution Explanation

3. Implementing the code

37. Microsoft Trees question Serialise And Deserialise Binary Tree (Hard)

1. Explaining the Serialisation

2. Walkthrough over pseudocode (Serialisation)

3. Explaining the Deserialisation

4. Walkthrough over pseudocode (Deserialisation)

38. Microsoft Trees question Binary Tree Maximum Path Sum (Hard)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Implementing the code

39. Google Stack Question Min Stack (Easy)

1. Brute force explanation

2. Walkthrough over pseudocode

3. Optimal solution explanation

4. Implementation

40. Amazon Stack Question Valid Parenthesis (Easy)

1. Explaining the problem

2. Intuition behind this problem

3. Pseudocode Implementation

4. Walkthrough over the pseudocode

5. Implementing the code

41. Apple Stack Question Binary Tree Level Order Traversal (Medium)

1. Explaining the problem

2. Walkthrough over pseudocode

3. Implementing the code

42. Microsoft Queue Question Binary Tree Zigzag Level Order Traversal (Medium)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Optimal solution explanation

5. Optimal solution pseudocode walkthrough

6. Implementing the code

43. Stack Question Binary Tree Postorder Traversal (Medium)

1. Explanation of the problem

2. Implementing the code

44. Google Dynamic Programming Question House Robber (Easy)

1. Explanation behind the problem

2. Intuition behind the problem

3. 2nd Approach Bottom Up dynamic programming

4. Walkthrough behind pseudocode

5. Implementing the code

45. Facebook Dynamic Programming Question Best Time To Buy And Sell Stocks (Easy)

1. Explanation behind the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Optimal solution explanation

5. Coding the solution

46. Amazon Dynamic Programming Question Climbing Stairs (Easy)

1. Explaining the problem

2. Intuition behind the problem

3. Implementation the pseudocode

4. Bottom up approach explanation

5. Bottom up approach walkthrough

6. Bottom up optimisation

7. Code - Climbing Stairs

47. Google Dynamic Programming Question Coin Change (Medium)

1. Explaining the problem

2. Intuition behind the problem

3. Pseudocode Implementation and optimisation

4. Bottom up approach explanation

5. Implementing the code

48. Bloomberg Dynamic Programming Question Unique Paths (Medium)

1. Explaining the problem

2. Pseudocode Implementation and walkthrough

3. Implementing the code

49. Microsoft Dynamic Programming Question Longest Palindromic Substring (Medium)

1. Explanation of the problem

2. Initial Intuition behind the problem

3. Optimising the previous solution

4. Pseudocode Implementation

5. Walkthrough over pseudocode

6. Implementing the code

50. Amazon Dynamic Programming Question Trapping Rain Water (Hard)

1. Explaining the problem

2. Coding the implementation

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