1. Array

Two sum

Best Time to Buy and Sell Stock

Contains Duplicate

Product of Array Except Self

Maximum Subarray

Maximum Product Subarray

Find Minimum in Rotated Sorted Array

Search in Rotated Sorted Array

3Sum

Container With Most Water

2. Binary

Sum of Two Integers

Number of 1 Bits

Counting Bits

Missing Number

Reverse Bits

3. Dynamic Programming

Climbing Stairs

Coin Change

Longest Increasing Subsequence

Longest Common Subsequence

Word Break Problem

Combination Sum

House Robber

House Robber II

Decode Ways

Unique Paths

Jump Game

4. Graph

Clone-graph

Course Schedule

Pacific Atlantic Water Flow

Number of Islands

Longest Consecutive Sequence

Alien Dictionary

Graph Valid Tree

Number of Connected Components in an Undirected Graph

5. Interval

Insert Interval

Merge Intervals

Non-overlapping Intervals

Meeting Rooms

Meeting Rooms II

6. Linked List

Reverse a Linked List

Detect Cycle in a Linked List

Merge Two Sorted Lists

Merge K Sorted Lists

Remove Nth Node From End Of List

Reorder List

7. Matrix

Set Matrix Zeroes

Spiral Matrix

Rotate Image

Word Search

8. String

Longest Substring Without Repeating Characters

Longest Repeating Character Replacement

Minimum Window Substring

Valid Anagram

Group Anagrams

Valid Parentheses

Valid Palindrome

Longest Palindromic Substring

Palindromic Substrings

Encode and Decode Strings

9. Tree

Maximum Depth of Binary Tree

Same Tree

Invert/Flip Binary Tree

Binary Tree Maximum Path Sum

Binary Tree Level Order Traversal

Serialize and Deserialize Binary Tree

Subtree of Another Tree

Construct Binary Tree from Preorder and Inorder Traversal

Validate Binary Search Tree

Kth Smallest Element in a BST

Lowest Common Ancestor of BST

Implement Trie (Prefix Tree)

Add and Search Word

Word Search II

10. Heap

Merge K Sorted Lists

Top K Frequent Elements

Find Median from Data Stream

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