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Array

11

Easy

4

Two Sum

Best Time to Buy and Sell Stock

Contains Duplicate

Majority Element

Medium

7

Product of Array Except Self

Maximum Product Subarray

Find Minimum in Rotated Sorted Array

3 Sum

Container With Most Water

3Sum

Sort Colors

Binary

6

Easy

5

Number of 1 Bits

Counting Bits

Missing Number

Reverse Bits

Add Binary

Medium

1

Sum of Two Integers

Binary Search

5

Easy

2

Binary Search

First Bad Version

Medium

2

Search in Rotated Sorted Array

Time Based Key-Value Store

Hard

1

Maximum Profit in Job Scheduling

Binary Search Tree

4

Easy

2

Maximum Depth of Binary Tree

Lowest Common Ancestor of a Binary Search Tree

Medium

2

Validate Binary Search Tree

Kth Smallest Element in a BST

Binary Tree

8

Easy

3

Invert Binary Tree

Balanced Binary Tree

Diameter of Binary Tree

Medium

4

Binary Tree Level Order Traversal

Construct Binary Tree from Preorder and Inorder Traversal

Lowest Common Ancestor of a Binary Tree

Binary Tree Right Side View

Hard

1

Serialize and Deserialize Binary Tree

Dynamic Programming

13

Easy

2

Maximum Subarray

Climbing Stairs

Medium

11

Coin Change

Longest Increasing Subsequence

Longest Common Subsequence

Word Break Problem

Combination Sum

House Robber

House Robber II

Decode Ways

Unique Paths

Jump Game

Partition Equal Subset Sum

Graph

15

Easy

1

Flood Fill

Medium

12

Clone Graph

Course Schedule

Pacific Atlantic Water Flow

Number of Islands

Longest Consecutive Sequence

Graph Valid Tree (Leetcode Premium)

Number of Connected Components in an Undirected Graph (Leetcode Premium)

Word Search

01 Matrix

Rotting Oranges

Accounts Merge

Minimum Height Trees

Hard

2

Alien Dictionary (Leetcode Premium)

Word Ladder

Hash Table

1

Easy

1

Ransom Note

Heap

4

Medium

3

Top K Frequent Elements

K Closest Points to Origin

Task Scheduler

Hard

1

Find Median from Data Stream

Interval

5

Easy

1

Meeting Rooms (Leetcode Premium)

Medium

4

Insert Interval

Merge Intervals

Non-overlapping Intervals

Meeting Rooms II (Leetcode Premium)

Linked List

10

Easy

6

Reverse a Linked List

Detect Cycle in a Linked List

Merge Two Sorted Lists

Linked List Cycle

Reverse Linked List

Middle of the Linked List

Medium

3

Remove Nth Node From End Of List

Reorder List

LRU Cache

Hard

1

Merge K Sorted Lists

Matrix

3

Medium

3

Set Matrix Zeroes

Spiral Matrix

Rotate Image

Recursion

3

Medium

3

Permutations

Subsets

Letter Combinations of a Phone Number

Stack

7

Easy

3

Valid Parentheses

Implement Queue using Stacks

Min Stack

Medium

1

Evaluate Reverse Polish Notation

Hard

3

Trapping Rain Water

Basic Calculator

Largest Rectangle in Histogram

String

12

Easy

3

Valid Anagram

Valid Palindrome

Longest Palindrome

Medium

8

Longest Substring Without Repeating Characters

Longest Repeating Character Replacement

Group Anagrams

Longest Palindromic Substring

Palindromic Substrings

Encode and Decode Strings (Leetcode Premium)

String to Integer (atoi)

Find All Anagrams in a String

Hard

1

Minimum Window Substring

Tree

8

Easy

4

Same Tree

Invert/Flip Binary Tree

Subtree of Another Tree

Lowest Common Ancestor of BST

Medium

2

Implement Trie (Prefix Tree)

Add and Search Word

Hard

2

Binary Tree Maximum Path Sum

Word Search II

Trie

1

Medium

1

Word Break

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