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
351. Android Unlock Patterns	Solve	Medium	Microsoft+1	Backtracking Bit Manipulation+2
353. Design Snake Game	Solve	Medium	Amazon+6	Array Design+3
355. Design Twitter	Solve	Medium	Amazon+2	Design Hash Table+2
356. Line Reflection	Solve	Medium	Yandex	Array Hash Table+1
357. Count Numbers with Unique Digits	Solve	Medium	Bloomberg	Backtracking Dynamic Programming+1
360. Sort Transformed Array	Solve	Medium	LinkedIn	Array Math+2
361. Bomb Enemy	Solve	Medium	Uber	Array Dynamic Programming+1
362. Design Hit Counter	Solve	Medium	Affirm+7	Array Binary Search+3
364. Nested List Weight Sum II	Solve	Medium	LinkedIn	Breadth-First Search Depth-First Search+1
365. Water and Jug Problem	Solve	Medium	Lyft	Breadth-First Search Depth-First Search+1
366. Find Leaves of Binary Tree	Solve	Medium	Amazon+4	Binary Tree Depth-First Search+1
368. Largest Divisible Subset	Solve	Medium	Google	Array Dynamic Programming+2
369. Plus One Linked List	Solve	Medium	Google	Linked List Math
370. Range Addition	Solve	Medium	Amazon+1	Array Prefix Sum
371. Sum of Two Integers	Solve	Medium	Facebook	Bit Manipulation Math
372. Super Pow	Solve	Medium	Adobe	Divide and Conquer Math
373. Find K Pairs with Smallest Sums	Solve	Medium	Amazon+4	Array Heap (Priority Queue)
375. Guess Number Higher or Lower II	Solve	Medium	Google	Dynamic Programming Game Theory+1
376. Wiggle Subsequence	Solve	Medium	Bloomberg	Array Dynamic Programming+1
377. Combination Sum IV	Solve	Medium	Adobe+9	Array Dynamic Programming
378. Kth Smallest Element in a Sorted Matrix	Solve	Medium	Adobe+7	Array Binary Search+3
379. Design Phone Directory	Solve	Medium	Amazon+1	Array Design+3
380. Insert Delete GetRandom O(1)	Solve	Medium	Affirm+8	Array Design+3
382. Linked List Random Node	Solve	Medium	Amazon+2	Linked List Math+2
384. Shuffle an Array	Solve	Medium	Apple+4	Array Design+2
385. Mini Parser	Solve	Medium	Airbnb	Depth-First Search Stack+1
386. Lexicographical Numbers	Solve	Medium	Amazon+6	Depth-First Search Trie
388. Longest Absolute File Path	Solve	Medium	Amazon+1	Depth-First Search Stack+1
390. Elimination Game	Solve	Medium	Adobe+2	Math Recursion
393. UTF-8 Validation	Solve	Medium	Facebook+1	Array Bit Manipulation
394. Decode String	Solve	Medium	Adobe+16	Recursion Stack+1
395. Longest Substring with At Least K Repeating Characters	Solve	Medium	Amazon+1	Divide and Conquer Hash Table+2
396. Rotate Function	Solve	Medium	Amazon+2	Array Dynamic Programming+1
397. Integer Replacement	Solve	Medium	Bloomberg	Bit Manipulation Dynamic Programming+2
398. Random Pick Index	Solve	Medium	Amazon+2	Hash Table Math+2
399. Evaluate Division	Solve	Medium	Adobe+8	Array Breadth-First Search+5
400. Nth Digit	Solve	Medium	Apple	Binary Search Math
402. Remove K Digits	Solve	Medium	Adobe+6	Greedy Monotonic Stack+2
406. Queue Reconstruction by Height	Solve	Medium	Facebook	Array Binary Indexed Tree+2
413. Arithmetic Slices	Solve	Medium	Amazon+1	Array Dynamic Programming+1
416. Partition Equal Subset Sum	Solve	Medium	Amazon+5	Array Dynamic Programming
417. Pacific Atlantic Water Flow	Solve	Medium	Amazon+3	Array Breadth-First Search+2
418. Sentence Screen Fitting	Solve	Medium	Google	Array Dynamic Programming+1
419. Battleships in a Board	Solve	Medium	Amazon+6	Array Depth-First Search+1
421. Maximum XOR of Two Numbers in an Array	Solve	Medium	Adobe+1	Array Bit Manipulation+2
423. Reconstruct Original Digits from English	Solve	Medium	JPMorgan	Hash Table Math+1
424. Longest Repeating Character Replacement	Solve	Medium	Adobe+3	Hash Table Sliding Window+1
426. Convert Binary Search Tree to Sorted Doubly Linked List	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
427. Construct Quad Tree	Solve	Medium	Uber	Array Divide and Conquer+2
429. N-ary Tree Level Order Traversal	Solve	Medium	Microsoft	Breadth-First Search Tree