Strivers A2Z DSA

#1043

Partition Array for Maximum Sum

Medium✓ Solution📹 Video

#132

Palindrome Partitioning II

Hard✓ Solution📹 Video

#1106

Parsing A Boolean Expression

Hard✓ Solution📹 Video

Recursion Stack String

Array Dynamic Programming Sorting

#1547

Minimum Cost to Cut a Stick

Hard✓ Solution📹 Video

#312

Burst Balloons

Hard✓ Solution📹 Video

#1048

Longest String Chain

Medium✓ Solution📹 Video

Array Dynamic Programming Hash Table+3

Array Binary Indexed Tree Dynamic Programming+1

#673

Number of Longest Increasing Subsequence

Medium✓ Solution📹 Video

#368

Largest Divisible Subset

Medium✓ Solution📹 Video

Array Dynamic Programming Math+1

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

Array Dynamic Programming Greedy

#714

Best Time to Buy and Sell Stock with Transaction Fee

Medium✓ Solution📹 Video

#188

Best Time to Buy and Sell Stock IV

Hard✓ Solution📹 Video

#123

Best Time to Buy and Sell Stock III

Hard✓ Solution📹 Video

Array Dynamic Programming Greedy

#122

Best Time to Buy and Sell Stock II

Medium✓ Solution📹 Video

#44

Wildcard Matching

Hard✓ Solution📹 Video

Dynamic Programming Greedy Recursion+1

#72

Edit Distance

Medium✓ Solution📹 Video

#115

Distinct Subsequences

Hard✓ Solution📹 Video

#1092

Shortest Common Supersequence

Hard📹 Video

#1312

Minimum Insertion Steps to Make a String Palindrome

Hard✓ Solution📹 Video

#516

Longest Palindromic Subsequence

Medium✓ Solution📹 Video

#583

Delete Operation for Two Strings

Medium✓ Solution📹 Video

#1143

Longest Common Subsequence

Medium✓ Solution📹 Video

#518

Coin Change II

Medium✓ Solution📹 Video

Array Breadth-First Search Dynamic Programming

#322

Coin Change

Medium✓ Solution📹 Video

Array Backtracking Dynamic Programming

#494

Target Sum

Medium✓ Solution📹 Video

#416

Partition Equal Subset Sum

Medium✓ Solution📹 Video

#2035

Partition Array Into Two Arrays to Minimize Sum Difference

Hard📹 Video

Array Binary Search Bit Manipulation+4

#931

Minimum Falling Path Sum

Medium✓ Solution📹 Video

#120

Triangle

Medium✓ Solution📹 Video

#63

Unique Paths II

Medium✓ Solution📹 Video

#64

Minimum Path Sum

Medium✓ Solution📹 Video

Combinatorics Dynamic Programming Math

#62

Unique Paths

Medium✓ Solution📹 Video

#213

House Robber II

Medium✓ Solution📹 Video

#198

House Robber

Medium✓ Solution📹 Video

Dynamic Programming Math Memoization

#70

Climbing Stairs

Easy✓ Solution📹 Video

#1392

Longest Happy Prefix

Hard📹 Video

Hash Function Rolling Hash String+1

String String Matching Two Pointers

#28

Find the Index of the First Occurrence in a String

Easy✓ Solution📹 Video

#214

Shortest Palindrome

Hard✓ Solution📹 Video

Hash Function Rolling Hash String+1

#38

Count and Say

Medium✓ Solution📹 Video

String

#686

Repeated String Match

Medium✓ Solution📹 Video

String String Matching

#421

Maximum XOR of Two Numbers in an Array

Medium✓ Solution📹 Video

Array Bit Manipulation Hash Table+1

Array Bit Manipulation Trie

#1707

Maximum XOR With an Element From Array

Hard📹 Video

#921

Minimum Add to Make Parentheses Valid

Medium✓ Solution📹 Video

Greedy Stack String

Biconnected Component Depth-First Search Graph

#1192

Critical Connections in a Network

Hard✓ Solution📹 Video

#208

Implement Trie (Prefix Tree)

Medium✓ Solution📹 Video

Design Hash Table String+1

Array Hash Table Union Find

#305Premium

Number of Islands II

Hard✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+2

#827

Making A Large Island

Hard✓ Solution📹 Video

Array Binary Search Breadth-First Search+4

#778

Swim in Rising Water

Hard📹 Video

#947

Most Stones Removed with Same Row or Column

Medium✓ Solution📹 Video

Depth-First Search Graph Hash Table+1

Array Breadth-First Search Depth-First Search+4

#721

Accounts Merge

Medium✓ Solution📹 Video

#1319

Number of Operations to Make Network Connected

Medium✓ Solution📹 Video

Dynamic Programming Graph Shortest Path

#1334

Find the City With the Smallest Number of Neighbors at a Threshold Distance

Medium✓ Solution📹 Video

Dynamic Programming Graph Shortest Path+1

#1976

Number of Ways to Arrive at Destination

Medium📹 Video

Breadth-First Search Depth-First Search Graph+2

#743

Network Delay Time

Medium✓ Solution📹 Video

Array Binary Search Breadth-First Search+4

#1631

Path With Minimum Effort

Medium✓ Solution📹 Video

Array Breadth-First Search Matrix

#1091

Shortest Path in Binary Matrix

Medium✓ Solution📹 Video

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

#787

Cheapest Flights Within K Stops

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+3

#269Premium

Alien Dictionary

Hard✓ Solution📹 Video

#802

Find Eventual Safe States

Medium✓ Solution📹 Video

#207

Course Schedule

Medium✓ Solution📹 Video

#210

Course Schedule II

Medium✓ Solution📹 Video

#785

Is Graph Bipartite?

Medium✓ Solution📹 Video

Backtracking Breadth-First Search Hash Table+1

#126

Word Ladder II

Hard✓ Solution📹 Video

Breadth-First Search Depth-First Search Hash Function+2

#711Premium

Number of Distinct Islands II

Hard📹 Video

Array Breadth-First Search Depth-First Search+2

#1020

Number of Enclaves

Medium✓ Solution📹 Video

Breadth-First Search Hash Table String

#127

Word Ladder

Hard✓ Solution📹 Video

Array Breadth-First Search Dynamic Programming+1

#542

01 Matrix

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+2

#130

Surrounded Regions

Medium✓ Solution📹 Video

Array Breadth-First Search Matrix

#994

Rotting Oranges

Medium✓ Solution📹 Video

Array Breadth-First Search Depth-First Search+1

#733

Flood Fill

Easy✓ Solution📹 Video

#547

Number of Provinces

Medium✓ Solution📹 Video

#323Premium

Number of Connected Components in an Undirected Graph

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Depth-First Search+1

#99

Recover Binary Search Tree

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Breadth-First Search+4

#653

Two Sum IV - Input is a BST

Easy✓ Solution📹 Video

Binary Search Tree Binary Tree Depth-First Search+1

#285Premium

Inorder Successor in BST

Medium✓ Solution📹 Video

#173

Binary Search Tree Iterator

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Design+3

#1008

Construct Binary Search Tree from Preorder Traversal

Medium✓ Solution📹 Video

Array Binary Search Tree Binary Tree+3

Binary Search Tree Binary Tree Depth-First Search+1

#235

Lowest Common Ancestor of a Binary Search Tree

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Depth-First Search+1

#230

Kth Smallest Element in a BST

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Depth-First Search+1

#98

Validate Binary Search Tree

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Tree

#450

Delete Node in a BST

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Tree

#701

Insert into a Binary Search Tree

Medium✓ Solution📹 Video

Binary Search Tree Binary Tree Tree

#700

Search in a Binary Search Tree

Easy✓ Solution📹 Video

Binary Tree Depth-First Search Linked List+2

#114

Flatten Binary Tree to Linked List

Medium✓ Solution📹 Video

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

#297

Serialize and Deserialize Binary Tree

Hard✓ Solution📹 Video

#106

Construct Binary Tree from Inorder and Postorder Traversal

Medium✓ Solution📹 Video

Array Binary Tree Divide and Conquer+2

Binary Search Binary Tree Bit Manipulation+1

#222

Count Complete Tree Nodes

Easy✓ Solution📹 Video

#105

Construct Binary Tree from Preorder and Inorder Traversal

Medium✓ Solution📹 Video

Array Binary Tree Divide and Conquer+2

Binary Tree Breadth-First Search Depth-First Search+2

#863

All Nodes Distance K in Binary Tree

Medium✓ Solution📹 Video

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

#662

Maximum Width of Binary Tree

Medium✓ Solution📹 Video

Binary Tree Depth-First Search Tree

#236

Lowest Common Ancestor of a Binary Tree

Medium✓ Solution📹 Video

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

#101

Symmetric Tree

Easy✓ Solution📹 Video

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

#199

Binary Tree Right Side View

Medium✓ Solution📹 Video

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

#314Premium

Binary Tree Vertical Order Traversal

Medium✓ Solution📹 Video

Binary Tree Breadth-First Search Tree

#103

Binary Tree Zigzag Level Order Traversal

Medium✓ Solution📹 Video

Binary Tree Depth-First Search Tree

#545Premium

Boundary of Binary Tree

Medium✓ Solution📹 Video

Binary Tree Depth-First Search Dynamic Programming+1

#124

Binary Tree Maximum Path Sum

Hard✓ Solution📹 Video

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

#100

Same Tree

Easy✓ Solution📹 Video

Binary Tree Depth-First Search Tree

#110

Balanced Binary Tree

Easy✓ Solution📹 Video