Strivers A2Z DSA

This sheet is made for people who want to learn DSA from A to Z for free in a well-organized and structured manner.

Azhar Khan249 problems8 Easy68 Med24 Hard

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Practice

Title	Solution	Practice	Difficulty	Companies	Topics
1277. Count Square Submatrices with All Ones	Solution	Solve	Medium	-	Array Dynamic Programming+1
1043. Partition Array for Maximum Sum	Solution	Solve	Medium	-	Array Dynamic Programming
132. Palindrome Partitioning II	Solution	Solve	Hard	-	Dynamic Programming String
1106. Parsing A Boolean Expression	Solution	Solve	Hard	-	Recursion Stack+1
1547. Minimum Cost to Cut a Stick	Solution	Solve	Hard	-	Array Dynamic Programming+1
312. Burst Balloons	Solution	Solve	Hard	-	Array Dynamic Programming
1048. Longest String Chain	Solution	Solve	Medium	-	Array Dynamic Programming+4
673. Number of Longest Increasing Subsequence	Solution	Solve	Medium	-	Array Binary Indexed Tree+2
368. Largest Divisible Subset	Solution	Solve	Medium	-	Array Dynamic Programming+2
300. Longest Increasing Subsequence	Solution	Solve	Medium	-	Array Binary Search+1
309. Best Time to Buy and Sell Stock with Cooldown	Solution	Solve	Medium	-	Array Dynamic Programming
714. Best Time to Buy and Sell Stock with Transaction Fee	Solution	Solve	Medium	-	Array Dynamic Programming+1
188. Best Time to Buy and Sell Stock IV	Solution	Solve	Hard	-	Array Dynamic Programming
123. Best Time to Buy and Sell Stock III	Solution	Solve	Hard	-	Array Dynamic Programming
122. Best Time to Buy and Sell Stock II	Solution	Solve	Medium	-	Array Dynamic Programming+1
44. Wildcard Matching	Solution	Solve	Hard	-	Dynamic Programming Greedy+2
72. Edit Distance	Solution	Solve	Medium	-	Dynamic Programming String
115. Distinct Subsequences	Solution	Solve	Hard	-	Dynamic Programming String
1092. Shortest Common Supersequence	Solution	Solve	Hard	-	Dynamic Programming String
1312. Minimum Insertion Steps to Make a String Palindrome	Solution	Solve	Hard	-	Dynamic Programming String
516. Longest Palindromic Subsequence	Solution	Solve	Medium	-	Dynamic Programming String
583. Delete Operation for Two Strings	Solution	Solve	Medium	-	Dynamic Programming String
1143. Longest Common Subsequence	Solution	Solve	Medium	-	Dynamic Programming String
518. Coin Change II	Solution	Solve	Medium	-	Array Dynamic Programming
322. Coin Change	Solution	Solve	Medium	-	Array Breadth-First Search+1
494. Target Sum	Solution	Solve	Medium	-	Array Backtracking+1
416. Partition Equal Subset Sum	Solution	Solve	Medium	-	Array Dynamic Programming
2035. Partition Array Into Two Arrays to Minimize Sum Difference	Solution	Solve	Hard	-	Array Binary Search+5
931. Minimum Falling Path Sum	Solution	Solve	Medium	-	Array Dynamic Programming+1
120. Triangle	Solution	Solve	Medium	-	Array Dynamic Programming
63. Unique Paths II	Solution	Solve	Medium	-	Array Dynamic Programming+1
64. Minimum Path Sum	Solution	Solve	Medium	-	Array Dynamic Programming+1
62. Unique Paths	Solution	Solve	Medium	-	Combinatorics Dynamic Programming+1
213. House Robber II	Solution	Solve	Medium	-	Array Dynamic Programming
198. House Robber	Solution	Solve	Medium	-	Array Dynamic Programming
70. Climbing Stairs	Solution	Solve	Easy	-	Dynamic Programming Math+1
1392. Longest Happy Prefix	Solution	Solve	Hard	-	Hash Function Rolling Hash+2
28. Find the Index of the First Occurrence in a String	Solution	Solve	Easy	-	String String Matching+1
214. Shortest Palindrome	Solution	Solve	Hard	-	Hash Function Rolling Hash+2
38. Count and Say	Solution	Solve	Medium	-	String
686. Repeated String Match	Solution	Solve	Medium	-	String String Matching
421. Maximum XOR of Two Numbers in an Array	Solution	Solve	Medium	-	Array Bit Manipulation+2
1707. Maximum XOR With an Element From Array	Solution	Solve	Hard	-	Array Bit Manipulation+1
921. Minimum Add to Make Parentheses Valid	Solution	Solve	Medium	-	Greedy Stack+1
1192. Critical Connections in a Network	Solution	Solve	Hard	-	Biconnected Component Depth-First Search+1
208. Implement Trie (Prefix Tree)	Solution	Solve	Medium	-	Design Hash Table+2
305. Number of Islands II	Solution	Solve	Hard	-	Array Hash Table+1
827. Making A Large Island	Solution	Solve	Hard	-	Array Breadth-First Search+3
778. Swim in Rising Water	Solution	Solve	Hard	-	Array Binary Search+5
947. Most Stones Removed with Same Row or Column	Solution	Solve	Medium	-	Depth-First Search Graph+2
721. Accounts Merge	Solution	Solve	Medium	-	Array Breadth-First Search+5
1319. Number of Operations to Make Network Connected	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance	Solution	Solve	Medium	-	Dynamic Programming Graph+1
1976. Number of Ways to Arrive at Destination	Solution	Solve	Medium	-	Dynamic Programming Graph+2
743. Network Delay Time	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+3
1631. Path With Minimum Effort	Solution	Solve	Medium	-	Array Binary Search+5
1091. Shortest Path in Binary Matrix	Solution	Solve	Medium	-	Array Breadth-First Search+1
787. Cheapest Flights Within K Stops	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+4
269. Alien Dictionary	Solution	Solve	Hard	-	Array Breadth-First Search+4
802. Find Eventual Safe States	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
207. Course Schedule	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
210. Course Schedule II	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
785. Is Graph Bipartite?	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
126. Word Ladder II	Solution	Solve	Hard	-	Backtracking Breadth-First Search+2
711. Number of Distinct Islands II	Solution	Solve	Hard	-	Breadth-First Search Depth-First Search+3
1020. Number of Enclaves	Solution	Solve	Medium	-	Array Breadth-First Search+3
127. Word Ladder	Solution	Solve	Hard	-	Breadth-First Search Hash Table+1
542. 01 Matrix	Solution	Solve	Medium	-	Array Breadth-First Search+2
130. Surrounded Regions	Solution	Solve	Medium	-	Array Breadth-First Search+3
994. Rotting Oranges	Solution	Solve	Medium	-	Array Breadth-First Search+1
733. Flood Fill	Solution	Solve	Easy	-	Array Breadth-First Search+2
547. Number of Provinces	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
323. Number of Connected Components in an Undirected Graph	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
99. Recover Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
653. Two Sum IV - Input is a BST	Solution	Solve	Easy	-	Binary Search Tree Binary Tree+5
285. Inorder Successor in BST	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
173. Binary Search Tree Iterator	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+4
1008. Construct Binary Search Tree from Preorder Traversal	Solution	Solve	Medium	-	Array Binary Search Tree+4
235. Lowest Common Ancestor of a Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
230. Kth Smallest Element in a BST	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
98. Validate Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
450. Delete Node in a BST	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+1
701. Insert into a Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+1
700. Search in a Binary Search Tree	Solution	Solve	Easy	-	Binary Search Tree Binary Tree+1
114. Flatten Binary Tree to Linked List	Solution	Solve	Medium	-	Binary Tree Depth-First Search+3
297. Serialize and Deserialize Binary Tree	Solution	Solve	Hard	-	Binary Tree Breadth-First Search+4
106. Construct Binary Tree from Inorder and Postorder Traversal	Solution	Solve	Medium	-	Array Binary Tree+3
222. Count Complete Tree Nodes	Solution	Solve	Medium	-	Binary Search Binary Tree+2
105. Construct Binary Tree from Preorder and Inorder Traversal	Solution	Solve	Medium	-	Array Binary Tree+3
863. All Nodes Distance K in Binary Tree	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+3
662. Maximum Width of Binary Tree	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+2
236. Lowest Common Ancestor of a Binary Tree	Solution	Solve	Medium	-	Binary Tree Depth-First Search+1
101. Symmetric Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
199. Binary Tree Right Side View	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+2
314. Binary Tree Vertical Order Traversal	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+4
103. Binary Tree Zigzag Level Order Traversal	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+1
545. Boundary of Binary Tree	Solution	Solve	Medium	-	Binary Tree Depth-First Search+1
124. Binary Tree Maximum Path Sum	Solution	Solve	Hard	-	Binary Tree Depth-First Search+2
100. Same Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
110. Balanced Binary Tree	Solution	Solve	Easy	-	Binary Tree Depth-First Search+1