LeetCode In Typescript:Algorithms Coding Interview Questions

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

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

1. Introduction to the problem

2. Brute Force solution Intuition

3. pseudocode walkthrough

4. Better Approach intuition

5. Approach 2 Pseudocode walkthrough

6. Implementing the code

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

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

1. Explaining the problem

2. Implementing the code

12. 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

13. 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

14. Google Hash Tables Dictionaries question Contains Duplicate

1. Introduction to the problem and multiple approaches

2. Optimal Approach

3. Code Implementation

15. 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)

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

1. Explanation - Group Anagrams - Medium #49

2. Code - Group Anagrams - Medium #49

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. Microsoft Hash Tables Dictionaries question LRU Cache (Medium)

1. Introduction to the problem

2. InputOuput for the problem

3. Intuition behind the problem

4. Pseudocode implementation

5. Pseudocode Walkthrough

19. 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 - Minimum Window Substring - Hard #76

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

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

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

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

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

21. 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

22. 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

23. 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 - Medium #2

5. Code - Add Two Numbers

24. 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 - Medium #19

6. Code - Remove Nth Node From End of List

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

1. Explanation - Odd Even Linked List

2. Intuition - Odd Even Linked List

3. Pseudocode Implementation - Odd Even Linked List

4. Walkthrough - Odd Even Linked List

5. Code - Odd Even Linked List

26. Google Linked list question Merge K sorted lists (Hard)

1. Explanation - Merge K Sorted Lists - Hard #23

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. Uber Backtracking question Combination Sum (Medium)

1. Explanation the problem

2. Intuition behind the problem

3. Walkthrough over the pseudocode

4. Implementing the code

30. Bloomberg Backtracking question Palindrome Partitioning (Medium)

1. Intuition behind the problem

2. Pseudocode implementation

3. Walkthrough over pseudocode

4. Implementing the code

31. Microsoft Trees question Symmetric Trees (Easy)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Implementing the code

32. 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 code

33. Amazon Trees question Path Sum (Easy)

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Coding the solution

34. 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

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

1. Explaining the problem

2. Optimized Solution Explanation- Kth Smallest Element in a BST - Medium #230

3. Code - Kth Smallest Element in a BST - Medium #230

36. 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)

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

1. Explaining the problem

2. Intuition behind the problem

3. Walkthrough over pseudocode

4. Coding the solution

38. Google Stack Question Min Stack (Easy)

1. Brute force explanation - Min Stack - Easy #155

2. Walkthrough over pseudocode

3. Optimal solution explanation

39. Amazon Stack Question Valid Parenthesis (Easy)

1. Explaining the problem

2. Intuition behind this problem

3. Pseudocode Implementation

4. Walkthrough over the pseudocode

5. Code - Valid Parenthesis - Easy #20

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

1. Explaining the problem

2. Walkthrough over pseudocode

3. Implementing the code

41. 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

42. Stack Question Binary Tree Postorder Traversal (Medium)

1. Explanation of the problem

2. Implementing the code

43. 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

44. 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

45. 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 - Climbing Stairs - Easy #70

6. Bottom up optimization - Climbing Stairs - Easy #70

7. Code - Climbing Stairs - Easy #70

46. 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

47. Bloomberg Dynamic Programming Question Unique Paths (Medium)

1. Explaining the problem

2. Pseudocode Implementation and walkthrough

3. Implementing the code

48. 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

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

1. Explaining the problem

2. coding the implementation

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