NeetCode 250

Binary Tree Breadth-First Search Depth-First Search+1

#199

Binary Tree Right Side View

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+2

#200

Number of Islands

Medium✓ Solution📹 Video

#201

Bitwise AND of Numbers Range

Medium✓ Solution📹 Video

Bit Manipulation

Hash Table Math Two Pointers

#202

Happy Number

Easy✓ Solution📹 Video

#207

Course Schedule

Medium✓ Solution📹 Video

#208

Implement Trie (Prefix Tree)

Medium✓ Solution📹 Video

Design Hash Table String+1

#210

Course Schedule II

Medium✓ Solution📹 Video

#211

Design Add and Search Words Data Structure

Medium✓ Solution📹 Video

Depth-First Search Design String+1

#212

Word Search II

Hard✓ Solution📹 Video

Array Backtracking Matrix+2

#213

House Robber II

Medium✓ Solution📹 Video

Array Divide and Conquer Heap (Priority Queue)+2

#215

Kth Largest Element in an Array

Medium✓ Solution📹 Video

Binary Tree Breadth-First Search Depth-First Search+1

#226

Invert Binary Tree

Easy✓ Solution📹 Video

Binary Search Tree Binary Tree Depth-First Search+1

#230

Kth Smallest Element in a BST

Medium✓ Solution📹 Video

#252Premium

Meeting Rooms

Easy✓ Solution📹 Video

Array Sorting

#253Premium

Meeting Rooms II

Medium✓ Solution📹 Video

Array Greedy Heap (Priority Queue)+3

#261Premium

Graph Valid Tree

Medium✓ Solution📹 Video

#268

Missing Number

Easy✓ Solution📹 Video

Array Binary Search Bit Manipulation+3

Array Breadth-First Search Depth-First Search+3

#269Premium

Alien Dictionary

Hard✓ Solution📹 Video

Breadth-First Search Dynamic Programming Math

#279

Perfect Squares

Medium✓ Solution📹 Video

Array Breadth-First Search Matrix

#286Premium

Walls and Gates

Medium✓ Solution📹 Video

Data Stream Design Heap (Priority Queue)+2

#295

Find Median from Data Stream

Hard✓ Solution📹 Video

Binary Tree Breadth-First Search Depth-First Search+3

#297

Serialize and Deserialize Binary Tree

Hard✓ Solution📹 Video

Array Binary Search Dynamic Programming

#300

Longest Increasing Subsequence

Medium✓ Solution📹 Video

#309

Best Time to Buy and Sell Stock with Cooldown

Medium✓ Solution📹 Video

#310

Minimum Height Trees

Medium✓ Solution📹 Video

#312

Burst Balloons

Hard✓ Solution📹 Video

Array Breadth-First Search Dynamic Programming

#322

Coin Change

Medium✓ Solution📹 Video

#323Premium

Number of Connected Components in an Undirected Graph

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+5

#329

Longest Increasing Path in a Matrix

Hard✓ Solution📹 Video

Depth-First Search Eulerian Circuit Graph

#332

Reconstruct Itinerary

Hard✓ Solution📹 Video

Binary Tree Depth-First Search Dynamic Programming+1

#337

House Robber III

Medium✓ Solution📹 Video

Bit Manipulation Dynamic Programming

#338

Counting Bits

Easy✓ Solution📹 Video

#343

Integer Break

Medium✓ Solution📹 Video

Dynamic Programming Math

Design Hash Table Heap (Priority Queue)+1

#355

Design Twitter

Medium✓ Solution📹 Video

#371

Sum of Two Integers

Medium✓ Solution📹 Video

Bit Manipulation Math

#377

Combination Sum IV

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+4

#399

Evaluate Division

Medium✓ Solution📹 Video

#416

Partition Equal Subset Sum

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+1

#417

Pacific Atlantic Water Flow

Medium✓ Solution📹 Video

#427

Construct Quad Tree

Medium✓ Solution📹 Video

Array Divide and Conquer Matrix+1

#435

Non-overlapping Intervals

Medium✓ Solution📹 Video

Array Dynamic Programming Greedy+1

Binary Search Tree Binary Tree Tree

#450

Delete Node in a BST

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+1

#463

Island Perimeter

Easy✓ Solution📹 Video

#473

Matchsticks to Square

Medium✓ Solution📹 Video

Array Backtracking Bit Manipulation+2

Array Backtracking Dynamic Programming

#494

Target Sum

Medium✓ Solution📹 Video

#502

IPO

Hard✓ Solution📹 Video

Array Greedy Heap (Priority Queue)+1

#518

Coin Change II

Medium✓ Solution📹 Video

Binary Tree Depth-First Search Tree

#543

Diameter of Binary Tree

Easy✓ Solution📹 Video

Binary Tree Depth-First Search Hash Function+2

#572

Subtree of Another Tree

Easy✓ Solution📹 Video

#621

Task Scheduler

Medium✓ Solution📹 Video

Array Counting Greedy+3

Dynamic Programming String Two Pointers

#647

Palindromic Substrings

Medium✓ Solution📹 Video

Array Heap (Priority Queue)

#1046

Last Stone Weight

Easy✓ Solution📹 Video

Linked List Math Number Theory

#2807

Insert Greatest Common Divisors in Linked List

Medium✓ Solution📹 Video

#2709

Greatest Common Divisor Traversal

Hard✓ Solution📹 Video

Array Math Number Theory+1

#2707

Extra Characters in a String

Medium✓ Solution📹 Video

Array Dynamic Programming Hash Table+2

Array Hash Table Heap (Priority Queue)+2

#2402

Meeting Rooms III

Hard✓ Solution📹 Video

#2392

Build a Matrix With Conditions

Hard✓ Solution📹 Video

Array Graph Matrix+1

#2013

Detect Squares

Medium✓ Solution📹 Video

Array Counting Design+1

#1899

Merge Triplets to Form Target Triplet

Medium✓ Solution📹 Video

Array Greedy

Dynamic Programming Prefix Sum Sliding Window+1

#1871

Jump Game VII

Medium✓ Solution📹 Video

#1863

Sum of All Subset XOR Totals

Easy✓ Solution📹 Video

Array Backtracking Bit Manipulation+3

Array Binary Search Heap (Priority Queue)+2

#1851

Minimum Interval to Include Each Query

Hard✓ Solution📹 Video

Array Heap (Priority Queue)Sorting

#1834

Single-Threaded CPU

Medium✓ Solution📹 Video

Array Binary Search Breadth-First Search+4

#1631

Path With Minimum Effort

Medium✓ Solution📹 Video

#1584

Min Cost to Connect All Points

Medium✓ Solution📹 Video

Array Graph Minimum Spanning Tree+1

#1489

Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree

Hard✓ Solution📹 Video

Graph Minimum Spanning Tree Sorting+2

#1462

Course Schedule IV

Medium✓ Solution📹 Video

Binary Tree Breadth-First Search Depth-First Search+1

#1448

Count Good Nodes in Binary Tree

Medium✓ Solution📹 Video

#1406

Stone Game III

Hard✓ Solution📹 Video

Array Dynamic Programming Game Theory+1

Greedy Heap (Priority Queue)String

#1405

Longest Happy String

Medium✓ Solution📹 Video

Binary Tree Depth-First Search Tree

#1325

Delete Leaves With a Given Value

Medium✓ Solution📹 Video

Dynamic Programming String

#1143

Longest Common Subsequence

Medium✓ Solution📹 Video

#1140

Stone Game II

Medium✓ Solution📹 Video

Array Dynamic Programming Game Theory+2

Dynamic Programming Math Memoization

#1137

N-th Tribonacci Number

Easy✓ Solution📹 Video

Array Heap (Priority Queue)Prefix Sum+2

#1094

Car Pooling

Medium✓ Solution📹 Video

#1071

Greatest Common Divisor of Strings

Easy✓ Solution📹 Video

Math String

#1049

Last Stone Weight II

Medium✓ Solution📹 Video

Array Binary Search Breadth-First Search+4

#778

Swim in Rising Water

Hard✓ Solution📹 Video

#678

Valid Parenthesis String

Medium✓ Solution📹 Video

Dynamic Programming Greedy Stack+1

#684

Redundant Connection

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+2

#695

Max Area of Island

Medium✓ Solution📹 Video

#698

Partition to K Equal Sum Subsets

Medium✓ Solution

Array Backtracking Bit Manipulation+3

Binary Search Tree Binary Tree Tree

#701

Insert into a Binary Search Tree

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Data Stream+3

#703

Kth Largest Element in a Stream

Easy✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+4

#721

Accounts Merge

Medium✓ Solution📹 Video

Breadth-First Search Depth-First Search Graph+2

#743

Network Delay Time

Medium✓ Solution📹 Video

#746

Min Cost Climbing Stairs

Easy✓ Solution📹 Video

#752

Open the Lock

Medium✓ Solution📹 Video

Array Breadth-First Search Hash Table+1

#763

Partition Labels

Medium✓ Solution📹 Video

Greedy Hash Table String+1

#767

Reorganize String

Medium✓ Solution📹 Video

Counting Greedy Hash Table+3

Array Divide and Conquer Dynamic Programming+2

#918

Maximum Sum Circular Subarray

Medium✓ Solution📹 Video

#997

Find the Town Judge

Easy✓ Solution📹 Video

Array Graph Hash Table

Array Breadth-First Search Matrix

#994

Rotting Oranges

Medium✓ Solution📹 Video

Array Dynamic Programming Sliding Window

#978

Longest Turbulent Subarray

Medium✓ Solution📹 Video

#973

K Closest Points to Origin

Medium✓ Solution📹 Video

Array Divide and Conquer Geometry+4

#953

Verifying an Alien Dictionary

Easy✓ Solution📹 Video

Array Hash Table String

#860

Lemonade Change

Easy✓ Solution📹 Video

Array Greedy

Breadth-First Search Depth-First Search Dynamic Programming+3

#787

Cheapest Flights Within K Stops

Medium✓ Solution📹 Video

#846

Hand of Straights

Medium✓ Solution📹 Video

Array Greedy Hash Table+1