Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
972. Equal Rational Numbers	Solve	Hard	Microsoft	Math String
975. Odd Even Jump	Solve	Hard	Google+1	Array Dynamic Programming+3
980. Unique Paths III	Solve	Hard	Amazon+1	Array Backtracking+2
982. Triples with Bitwise AND Equal To Zero	Solve	Hard	Flipkart	Array Bit Manipulation+1
987. Vertical Order Traversal of a Binary Tree	Solve	Hard	Amazon+4	Binary Tree Breadth-First Search+4
992. Subarrays with K Different Integers	Solve	Hard	Adobe+10	Array Counting+2
995. Minimum Number of K Consecutive Bit Flips	Solve	Hard	Akuna Capital+1	Array Bit Manipulation+3
996. Number of Squareful Arrays	Solve	Hard	Apple+1	Array Backtracking+5
1000. Minimum Cost to Merge Stones	Solve	Hard	Amazon+3	Array Dynamic Programming+1
1001. Grid Illumination	Solve	Hard	Dropbox	Array Hash Table
1012. Numbers With Repeated Digits	Solve	Hard	Google+2	Dynamic Programming Math
1028. Recover a Tree From Preorder Traversal	Solve	Hard	Amazon+2	Binary Tree Depth-First Search+2
1032. Stream of Characters	Solve	Hard	Amazon+3	Array Data Stream+3
1036. Escape a Large Maze	Solve	Hard	Apple+2	Array Breadth-First Search+2
1044. Longest Duplicate Substring	Solve	Hard	-	Binary Search Hash Function+4
1063. Number of Valid Subarrays	Solve	Hard	Amazon+1	Array Monotonic Stack+1
1067. Digit Count in Range	Solve	Hard	Amazon	Dynamic Programming Math
1074. Number of Submatrices That Sum to Target	Solve	Hard	Amazon+2	Array Hash Table+2
1088. Confusing Number II	Solve	Hard	Google	Backtracking Math
1092. Shortest Common Supersequence	Solve	Hard	Amazon+4	Dynamic Programming String
1095. Find in Mountain Array	Solve	Hard	Adobe+8	Array Binary Search+1
1096. Brace Expansion II	Solve	Hard	Google	Backtracking Breadth-First Search+2
1097. Game Play Analysis V	Solve	Hard	GSN Games	Database
1106. Parsing A Boolean Expression	Solve	Hard	Affinity+1	Recursion Stack+1
1121. Divide Array Into Increasing Sequences	Solve	Hard	Google	Array Counting
1125. Smallest Sufficient Team	Solve	Hard	Amazon	Array Bit Manipulation+2
1127. User Purchase Platform	Solve	Hard	LinkedIn	Database
1147. Longest Chunked Palindrome Decomposition	Solve	Hard	Google	Dynamic Programming Greedy+4
1153. String Transforms Into Another String	Solve	Hard	Amazon+4	Hash Table String
1157. Online Majority Element In Subarray	Solve	Hard	Nutanix	Array Binary Indexed Tree+3
1159. Market Analysis II	Solve	Hard	Poshmark	Database
1163. Last Substring in Lexicographical Order	Solve	Hard	Mathworks	String Two Pointers
1168. Optimize Water Distribution in a Village	Solve	Hard	Google	Graph Heap (Priority Queue)+2
1172. Dinner Plate Stacks	Solve	Hard	-	Design Hash Table+2
1178. Number of Valid Words for Each Puzzle	Solve	Hard	Dropbox	Array Bit Manipulation+3
1183. Maximum Number of Ones	Solve	Hard	Qualcomm	Greedy Heap (Priority Queue)
1187. Make Array Strictly Increasing	Solve	Hard	-	Array Binary Search+2
1192. Critical Connections in a Network	Solve	Hard	Adobe+4	Biconnected Component Depth-First Search+1
1194. Tournament Winners	Solve	Hard	Wayfair	Database
1199. Minimum Time to Build Blocks	Solve	Hard	Google	Array Greedy+2
1203. Sort Items by Groups Respecting Dependencies	Solve	Hard	Amazon	Breadth-First Search Depth-First Search+2
1206. Design Skiplist	Solve	Hard	eBay+5	Design Linked List
1210. Minimum Moves to Reach Target with Rotations	Solve	Hard	Kakao	Array Breadth-First Search+1
1216. Valid Palindrome III	Solve	Hard	Amazon+1	Dynamic Programming String
1220. Count Vowels Permutation	Solve	Hard	Amazon+2	Dynamic Programming
1223. Dice Roll Simulation	Solve	Hard	Akuna Capital	Array Dynamic Programming
1224. Maximum Equal Frequency	Solve	Hard	American Express	Array Hash Table
1225. Report Contiguous Dates	Solve	Hard	Facebook	Database
1231. Divide Chocolate	Solve	Hard	Google+1	Array Binary Search
1235. Maximum Profit in Job Scheduling	Solve	Hard	Adobe+18	Array Binary Search+2