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
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
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
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
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
333. Largest BST Subtree	Solve	Medium	Cohesity+2	Binary Search Tree Binary Tree+3
334. Increasing Triplet Subsequence	Solve	Medium	Facebook+1	Array Greedy
339. Nested List Weight Sum	Solve	Medium	Amazon+2	Breadth-First Search Depth-First Search
341. Flatten Nested List Iterator	Solve	Medium	Airbnb+10	Depth-First Search Design+4
343. Integer Break	Solve	Medium	Adobe+12	Dynamic Programming Math
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
366. Find Leaves of Binary Tree	Solve	Medium	Amazon+4	Binary Tree Depth-First Search+1
371. Sum of Two Integers	Solve	Medium	Facebook	Bit Manipulation Math
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
380. Insert Delete GetRandom O(1)	Solve	Medium	Affirm+8	Array Design+3
384. Shuffle an Array	Solve	Medium	Apple+4	Array Design+2
386. Lexicographical Numbers	Solve	Medium	Amazon+6	Depth-First Search Trie
393. UTF-8 Validation	Solve	Medium	Facebook+1	Array Bit Manipulation
394. Decode String	Solve	Medium	Adobe+16	Recursion Stack+1
398. Random Pick Index	Solve	Medium	Amazon+2	Hash Table Math+2
399. Evaluate Division	Solve	Medium	Adobe+8	Array Breadth-First Search+5
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
416. Partition Equal Subset Sum	Solve	Medium	Amazon+5	Array Dynamic Programming
419. Battleships in a Board	Solve	Medium	Amazon+6	Array Depth-First Search+1
426. Convert Binary Search Tree to Sorted Doubly Linked List	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
435. Non-overlapping Intervals	Solve	Medium	Amazon+7	Array Dynamic Programming+2
437. Path Sum III	Solve	Medium	DoorDash+3	Binary Tree Depth-First Search+1
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
443. String Compression	Solve	Medium	Amazon+8	String Two Pointers
445. Add Two Numbers II	Solve	Medium	Accenture+49	Linked List Math+1
451. Sort Characters By Frequency	Solve	Medium	Amazon+4	Bucket Sort Counting+4
452. Minimum Number of Arrows to Burst Balloons	Solve	Medium	Facebook+2	Array Greedy+1
454. 4Sum II	Solve	Medium	Adobe+3	Array Hash Table
490. The Maze	Solve	Medium	Amazon+6	Array Breadth-First Search+2
494. Target Sum	Solve	Medium	Adobe+4	Array Backtracking+1
498. Diagonal Traverse	Solve	Medium	Facebook+2	Array Matrix+1
503. Next Greater Element II	Solve	Medium	Adobe+9	Array Monotonic Stack+1