General Details

Here are the top 50 patterns of LeetCode questions:

1. Sliding Window

• Maximum Subarray

• Longest Substring Without Repeating Characters

2. Two Pointers

• Two Sum

• Reverse Linked List

• Remove Duplicates from Sorted Array

3. Dynamic Programming

• Fibonacci Number

• Longest Common Subsequence

• Minimum Path Sum

4. Depth-First Search (DFS)

• Binary Tree Inorder Traversal

• Validate Binary Search Tree

• Find a Corresponding Node of a Binary Tree in a Clone of That Tree

5. Breadth-First Search (BFS)

• Binary Tree Level Order Traversal

• Rotting Oranges

• Minimum Depth of Binary Tree

6. Hash Table

• Two Sum

• Contains Duplicate

• Group Anagrams

7. Greedy

• Coin Change

• Jump Game

• Best Time to Buy and Sell Stock

8. Bit Manipulation

• Reverse Bits

• Number of 1 Bits

• Add Binary

9. Binary Search

• Search Insert Position

• Find First and Last Position of Element in Sorted Array

• Find Peak Element

10. Graph

• Clone Graph

• Course Schedule

• Number of Islands

11. Trie

• Implement Trie (Prefix Tree)

• Add and Search Word

• Word Search II

12. Union Find

• Friend Circles

• Accounts Merge

• Redundant Connection

13. Topological Sort

• Course Schedule

• Alien Dictionary

• Topological Sorting

14. Recursion

• Binary Tree Inorder Traversal

• Permutations

• Combinations

15. Memoization

• Fibonacci Number

• Longest Common Subsequence

• Minimum Path Sum

16. Knapsack

• 0/1 Knapsack Problem

• Unbounded Knapsack Problem

• Fractional Knapsack Problem

17. Linked List

• Reverse Linked List

• Detect Cycle in Linked List

• Remove Duplicates from Sorted List

18. Stack

• Evaluate Reverse Polish Notation

• Implement Stack using Queues

• Daily Temperatures

19. Queue

• Implement Queue using Stacks

• Sliding Window Maximum

• Design Circular Queue

20. String

• Reverse String

• Implement strStr()

• Find All Anagrams in a String

21. Array

• Rotate Array

• Search in Rotated Sorted Array

• Find First and Last Position of Element in Sorted Array

22. Matrix

• Spiral Matrix

• Rotate Image

• Search a 2D Matrix

23. Backtracking

• Permutations

• Combinations

• N-Queens

24. Segment Tree

• Range Sum Query

• Range Minimum Query

• Range Update Query

25. Suffix Tree

• Suffix Tree Construction

• Suffix Tree Queries

• Longest Common Prefix

26. LRU Cache

• LRU Cache Implementation

• LRU Cache with TTL

27. Trie + DFS

• Word Search

• Word Search II

• Find Words

28. Binary Indexed Tree

• Binary Indexed Tree Construction

• Range Sum Query

• Range Update Query

29. Sweep Line

• Meeting Rooms

• Meeting Rooms II

• The Skyline Problem

30. Topological Sort + DFS

• Course Schedule

• Alien Dictionary

• Topological Sorting

31. Union Find + DFS

• Friend Circles

• Accounts Merge

• Redundant Connection

32. Trie + BFS

• Word Ladder

• Word Ladder II

• Find Words

33. Dynamic Programming + Bit Mask

• Partition Problem

• Subset Sum Problem

• Knapsack Problem

34. Greedy + Binary Search

• Coin Change

• Jump Game

• Best Time to Buy and Sell Stock

35. Sliding Window + Hash Table

• Longest Substring Without Repeating Characters

• Maximum Subarray

• Longest Substring with At Least K Repeating Characters

36. DFS + Memoization

• Fibonacci Number

• Longest Common Subsequence

• Minimum Path Sum

37. BFS + Queue

• Binary Tree Level Order Traversal

• Rotting Oranges

• Minimum Depth of Binary Tree

38. Trie + Trie

• Word Search

• Word Search II

• Find Words

39. Segment Tree + Lazy Propagation

• Range Sum Query

• Range Minimum Query

• Range Update Query

40. Suffix Array

• Suffix Array Construction

• Suffix Array Queries

• Longest Common Prefix

41. Aho-Corasick

• Aho-Corasick Algorithm

• Multi-Pattern String Matching

• Find All Anagrams in a String

42. Manacher's Algorithm

• Longest