Dashboard Questions Topics Companies Sheets

Facebook Interview Questions

524 coding problems asked in Facebook interviews. Prepare for your technical interview with real questions.

524

Problems

139

Easy

302

Medium

Hard

Difficulty

All524 Easy139 Medium302 Hard83

Title	Solve	Difficulty	Companies	Topics
236. Lowest Common Ancestor of a Binary Tree	Solve	Medium	Amazon+9	Binary Tree Depth-First Search+1
238. Product of Array Except Self	Solve	Medium	Adobe+8	Array Prefix Sum
239. Sliding Window Maximum	Solve	Hard	Accion Labs India+66	Array Heap (Priority Queue)+3
240. Search a 2D Matrix II	Solve	Medium	Amazon+5	Array Binary Search+2
242. Valid Anagram	Solve	Easy	Affirm+8	Hash Table Sorting+1
243. Shortest Word Distance	Solve	Easy	Amazon+4	Array String
246. Strobogrammatic Number	Solve	Easy	Facebook+1	Hash Table String+1
247. Strobogrammatic Number II	Solve	Medium	Facebook+2	Array Recursion+1
249. Group Shifted Strings	Solve	Medium	Facebook+1	Array Hash Table+1
253. Meeting Rooms II	Solve	Medium	Amazon+8	Array Greedy+4
257. Binary Tree Paths	Solve	Easy	Amazon+4	Backtracking Binary Tree+3
263. Ugly Number	Solve	Easy	Adobe+4	Math
265. Paint House II	Solve	Hard	Facebook+2	Array Dynamic Programming
266. Palindrome Permutation	Solve	Easy	Facebook	Bit Manipulation Hash Table+1
268. Missing Number	Solve	Easy	Adobe+8	Array Binary Search+4
269. Alien Dictionary	Solve	Hard	Airbnb+8	Array Breadth-First Search+4
270. Closest Binary Search Tree Value	Solve	Easy	Facebook	Binary Search Binary Search Tree+3
271. Encode and Decode Strings	Solve	Medium	Facebook+1	Array Design+1
273. Integer to English Words	Solve	Hard	Amazon+7	Math Recursion+1
274. H-Index	Solve	Medium	Alation+4	Array Counting Sort+1
277. Find the Celebrity	Solve	Medium	Amazon+5	Graph Interactive+1
278. First Bad Version	Solve	Easy	Adobe+6	Binary Search Interactive
282. Expression Add Operators	Solve	Hard	Facebook	Backtracking Math+1
283. Move Zeroes	Solve	Easy	Adobe+11	Array Two Pointers
285. Inorder Successor in BST	Solve	Medium	Adobe+3	Binary Search Tree Binary Tree+2
286. Walls and Gates	Solve	Medium	Amazon+6	Array Breadth-First Search+1
287. Find the Duplicate Number	Solve	Medium	Adobe+30	Array Binary Search+2
288. Unique Word Abbreviation	Solve	Medium	Facebook+1	Array Design+2
295. Find Median from Data Stream	Solve	Hard	Adobe+33	Data Stream Design+3
296. Best Meeting Point	Solve	Hard	Expedia+2	Array Math+2
298. Binary Tree Longest Consecutive Sequence	Solve	Medium	Amazon+2	Binary Tree Depth-First Search+1
299. Bulls and Cows	Solve	Medium	Facebook+1	Counting Hash Table+1
300. Longest Increasing Subsequence	Solve	Medium	Accenture+78	Array Binary Search+1
301. Remove Invalid Parentheses	Solve	Hard	Amazon+1	Backtracking Breadth-First Search+1
303. Range Sum Query - Immutable	Solve	Easy	Facebook	Array Design+1
304. Range Sum Query 2D - Immutable	Solve	Medium	Amazon+4	Array Design+2
311. Sparse Matrix Multiplication	Solve	Medium	Amazon+3	Array Hash Table+1
314. Binary Tree Vertical Order Traversal	Solve	Medium	Amazon+3	Binary Tree Breadth-First Search+4
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
319. Bulb Switcher	Solve	Medium	Apple+3	Brainteaser Math
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
325. Maximum Size Subarray Sum Equals k	Solve	Medium	Amazon+1	Array Hash Table+1
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
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
336. Palindrome Pairs	Solve	Hard	Airbnb+5	Array Hash Table+2