Complete Binary Tree

1. Bank Account Implementation

2. LINQ Filter For a List of Greater Integers

3. Thread-Safe Singleton Implementation

4. Simple Event System Using Delegates

5. Read and Write Objects Using Basic Serialization

6. Retry Mechanism

7. Calculator with Parentheses

8. Find Unique Triplets with Target Sum

9. LFU Cache Implementation

10. Stack with Min Operation

11. Lowest Common Ancestor

12. Find All Anagrams in a String

13. Circular Queue with Dynamic Resizing

14. Merge K Sorted Arrays into One Sorted Array

15. Combinations of K Numbers that Sum to N

16. Rotate a linked list to the right by k places

17. Kth Smallest Element in a BST

18. Longest Common Subsequence of two Strings

19. Clone a Directed Graph

20. Snake Game

21. 2x2 Puzzle Using Breadth-First Search

22. Delete a node in a BST given a key

23. Number of Islands in a 2D Grid

24. Insert, Delete, getRandom in O(1) Time

25. Graph is Bipartite

26. Trie with Insert, Search, and startsWith Methods

27. Find the Celebrity in a Party

28. Valid IP Addresses

29. Iterator for a Binary Search Tree

30. Reverse Polish Notation

31. Number is a Power of Another Number

32. String Compression Algorithm

33. Time-Based Key-Value Store

34. Longest Substring with at Most k Distinct Characters

35. Queue Using Two Stacks

36. Adding and Searching Words

37. Peak Element in an Array

38. Check if a Graph Has a Cycle

39. LRU Cache

40. Count Primes

41. Rearramge Linked List

42. pow(x, n) efficiently (calculate x raised to power n)

43. Encode and Decode Strings

44. Number to Hexadecimal

45. If String is a Rotation of Another

46. First Non-Repeating Character

48. Binary Tree is a Valid BST

49. Sorted Array to a Balanced Binary Search Tree.

50. Maximum Path Sum in Binary Tree