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
301. Remove Invalid Parentheses	Solve	Hard	Amazon+1	Backtracking Breadth-First Search+1
302. Smallest Rectangle Enclosing Black Pixels	Solve	Hard	Google	Array Binary Search+3
303. Range Sum Query - Immutable	Solve	Easy	Facebook	Array Design+1
304. Range Sum Query 2D - Immutable	Solve	Medium	Amazon+4	Array Design+2
305. Number of Islands II	Solve	Hard	Google+1	Array Hash Table+1
306. Additive Number	Solve	Medium	Booking.com+1	Backtracking String
307. Range Sum Query - Mutable	Solve	Medium	Amazon+1	Array Binary Indexed Tree+2
308. Range Sum Query 2D - Mutable	Solve	Medium	Google	Array Binary Indexed Tree+3
309. Best Time to Buy and Sell Stock with Cooldown	Solve	Medium	Adobe+5	Array Dynamic Programming
310. Minimum Height Trees	Solve	Medium	Amazon+1	Breadth-First Search Depth-First Search+2
311. Sparse Matrix Multiplication	Solve	Medium	Amazon+3	Array Hash Table+1
312. Burst Balloons	Solve	Hard	Amazon+5	Array Dynamic Programming
313. Super Ugly Number	Solve	Medium	Apple+2	Array Dynamic Programming+1
314. Binary Tree Vertical Order Traversal	Solve	Medium	Amazon+3	Binary Tree Breadth-First Search+4
315. Count of Smaller Numbers After Self	Solve	Hard	Adobe+3	Array Binary Indexed Tree+5
316. Remove Duplicate Letters	Solve	Medium	Amazon+6	Greedy Monotonic Stack+2
317. Shortest Distance from All Buildings	Solve	Hard	DoorDash+3	Array Breadth-First Search+1
318. Maximum Product of Word Lengths	Solve	Medium	Bloomberg	Array Bit Manipulation+1
319. Bulb Switcher	Solve	Medium	Apple+3	Brainteaser Math
320. Generalized Abbreviation	Solve	Medium	Google	Backtracking Bit Manipulation+1
321. Create Maximum Number	Solve	Hard	Apple+1	Array Greedy+3
322. Coin Change	Solve	Medium	Amazon+7	Array Breadth-First Search+1
323. Number of Connected Components in an Undirected Graph	Solve	Medium	Amazon+5	Breadth-First Search Depth-First Search+2
324. Wiggle Sort II	Solve	Medium	Adobe	Array Divide and Conquer+3
325. Maximum Size Subarray Sum Equals k	Solve	Medium	Amazon+1	Array Hash Table+1
326. Power of Three	Solve	Easy	Amazon	Math Recursion
327. Count of Range Sum	Solve	Hard	Adobe+2	Array Binary Indexed Tree+5
328. Odd Even Linked List	Solve	Medium	Adobe+4	Linked List
329. Longest Increasing Path in a Matrix	Solve	Hard	Amazon+14	Array Breadth-First Search+6
330. Patching Array	Solve	Hard	Amazon	Array Greedy
331. Verify Preorder Serialization of a Binary Tree	Solve	Medium	Google	Binary Tree Stack+2
332. Reconstruct Itinerary	Solve	Hard	Amazon+9	Depth-First Search Eulerian Circuit+1
333. Largest BST Subtree	Solve	Medium	Cohesity+2	Binary Search Tree Binary Tree+3
334. Increasing Triplet Subsequence	Solve	Medium	Facebook+1	Array Greedy
335. Self Crossing	Solve	Hard	Amazon+1	Array Geometry+1
336. Palindrome Pairs	Solve	Hard	Airbnb+5	Array Hash Table+2
337. House Robber III	Solve	Medium	Adobe+2	Binary Tree Depth-First Search+2
338. Counting Bits	Solve	Easy	Adobe+33	Bit Manipulation Dynamic Programming
339. Nested List Weight Sum	Solve	Medium	Amazon+2	Breadth-First Search Depth-First Search
340. Longest Substring with At Most K Distinct Characters	Solve	Medium	Amazon+1	Hash Table Sliding Window+1
341. Flatten Nested List Iterator	Solve	Medium	Airbnb+10	Depth-First Search Design+4
342. Power of Four	Solve	Easy	Adobe+4	Bit Manipulation Math+1
343. Integer Break	Solve	Medium	Adobe+12	Dynamic Programming Math
344. Reverse String	Solve	Easy	Adobe+6	String Two Pointers
345. Reverse Vowels of a String	Solve	Easy	Bloomberg	String Two Pointers
346. Moving Average from Data Stream	Solve	Easy	Amazon+3	Array Data Stream+2
347. Top K Frequent Elements	Solve	Medium	Adobe+9	Array Bucket Sort+6
348. Design Tic-Tac-Toe	Solve	Medium	Adobe+4	Array Design+3
349. Intersection of Two Arrays	Solve	Easy	Adobe+7	Array Binary Search+3
350. Intersection of Two Arrays II	Solve	Easy	Adobe+4	Array Binary Search+3