Arrays & Hashing

• [x] Contains Duplicate
• [ ] Valid Anagram
• [x] Two Sum
• [ ] Group Anagrams
• [ ] Top K Frequent Elements
• [x] Product of Array Except Self
• [ ] Valid Sudoku
• [ ] Encode and Decode Strings
• [ ] Longest Consecutive Sequence

---

Two Pointers

• [ ] Valid Palindrome
• [ ] Two Sum II Input Array Is Sorted
• [ ] 3Sum
• [ ] Container With Most Water
• [ ] Trapping Rain Water

---

Sliding Window

• [x] Best Time to Buy and Sell Stock
• [ ] Longest Substring Without Repeating Characters
• [ ] Longest Repeating Character Replacement
• [ ] Permutation In String
• [ ] Minimum Window Substring
• [ ] Sliding Window Maximum

---

Stack

• [ ] Valid Parentheses
• [ ] Min Stack
• [ ] Evaluate Reverse Polish Notation
• [ ] Generate Parentheses
• [ ] Daily Temperatures
• [ ] Car Fleet
• [ ] Largest Rectangle In Histogram

---

Binary Search

• [ ] Binary Search
• [ ] Search a 2D Matrix
• [ ] Koko Eating Bananas
• [ ] Find Minimum In Rotated Sorted Array
• [ ] Search In Rotated Sorted Array
• [ ] Time Based Key Value Store
• [ ] Median of Two Sorted Arrays

---

Linked List

• [x] Reverse Linked List
• [x] Merge Two Sorted Lists
• [ ] Reorder List
• [ ] Remove Nth Node From End of List
• [ ] Copy List With Random Pointer
• [ ] Add Two Numbers
• [x] Linked List Cycle
• [ ] Find The Duplicate Number
• [ ] LRU Cache
• [ ] Merge K Sorted Lists
• [ ] Reverse Nodes In K Group

---

Trees

• [ ] Invert Binary Tree
• [ ] Maximum Depth of Binary Tree
• [ ] Diameter of Binary Tree
• [ ] Balanced Binary Tree
• [ ] Same Tree
• [ ] Subtree of Another Tree
• [ ] Lowest Common Ancestor of a Binary Search Tree
• [ ] Binary Tree Level Order Traversal
• [ ] Binary Tree Right Side View
• [ ] Count Good Nodes In Binary Tree
• [ ] Validate Binary Search Tree
• [ ] Kth Smallest Element In a Bst
• [ ] Construct Binary Tree From Preorder And Inorder Traversal
• [ ] Binary Tree Maximum Path Sum
• [ ] Serialize And Deserialize Binary Tree

---

Tries

• [ ] Implement Trie Prefix Tree
• [ ] Design Add And Search Words Data Structure
• [ ] Word Search II

---

Heap / Priority Queue

• [ ] Kth Largest Element In a Stream
• [ ] Last Stone Weight
• [ ] K Closest Points to Origin
• [ ] Kth Largest Element In An Array
• [ ] Task Scheduler
• [ ] Design Twitter
• [ ] Find Median From Data Stream

---

Backtracking

• [ ] Subsets
• [ ] Combination Sum
• [ ] Permutations
• [ ] Subsets II
• [ ] Combination Sum II
• [ ] Word Search
• [ ] Palindrome Partitioning
• [ ] Letter Combinations of a Phone Number
• [ ] N Queens

---

Graphs

• [ ] Number of Islands
• [ ] Clone Graph
• [ ] Max Area of Island
• [ ] Pacific Atlantic Water Flow
• [ ] Surrounded Regions
• [ ] Rotting Oranges
• [ ] Walls And Gates
• [ ] Course Schedule
• [ ] Course Schedule II
• [ ] Redundant Connection
• [ ] Number of Connected Components In An Undirected Graph
• [ ] Graph Valid Tree
• [ ] Word Ladder

---

Advanced Graphs

• [ ] Reconstruct Itinerary
• [ ] Min Cost to Connect All Points
• [ ] Network Delay Time
• [ ] Swim In Rising Water
• [ ] Alien Dictionary
• [ ] Cheapest Flights Within K Stops

---

1-D Dynamic Programming

• [x] Climbing Stairs
• [ ] Min Cost Climbing Stairs
• [ ] House Robber
• [ ] House Robber II
• [ ] Longest Palindromic Substring
• [ ] Palindromic Substrings
• [ ] Decode Ways
• [x] Coin Change
• [ ] Maximum Product Subarray
• [ ] Word Break
• [ ] Longest Increasing Subsequence
• [ ] Partition Equal Subset Sum

---

2-D Dynamic Programming

• [ ] Unique Paths
• [x] Longest Common Subsequence
• [ ] Best Time to Buy And Sell Stock With Cooldown
• [ ] Coin Change II
• [ ] Target Sum
• [ ] Interleaving String
• [ ] Longest Increasing Path In a Matrix
• [ ] Distinct Subsequences
• [ ] Edit Distance
• [ ] Burst Balloons
• [ ] Regular Expression Matching

---

Greedy

• [ ] Maximum Subarray
• [ ] Jump Game
• [ ] Jump Game II
• [ ] Gas Station
• [ ] Hand of Straights
• [ ] Merge Triplets to Form Target Triplet
• [ ] Partition Labels
• [ ] Valid Parenthesis String

---

Intervals

• [ ] Insert Interval
• [ ] Merge Intervals
• [ ] Non Overlapping Intervals
• [ ] Meeting Rooms
• [ ] Meeting Rooms II
• [ ] Minimum Interval to Include Each Query

---

Math & Geometry

• [ ] Rotate Image
• [ ] Spiral Matrix
• [ ] Set Matrix Zeroes
• [ ] Happy Number
• [ ] Plus One
• [ ] Pow(x, n)
• [ ] Multiply Strings
• [ ] Detect Squares

---

Bit Manipulation

• [ ] Single Number
• [ ] Number of 1 Bits
• [ ] Counting Bits
• [ ] Reverse Bits
• [ ] Missing Number
• [ ] Sum of Two Integers
• [ ] Reverse Integer

---

• All NeetCode 150 Questions