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
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
344. Reverse String	Solve	Easy	Adobe+6	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
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
381. Insert Delete GetRandom O(1) - Duplicates allowed	Solve	Hard	Affirm+2	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
387. First Unique Character in a String	Solve	Easy	Amazon+8	Counting Hash Table+2
392. Is Subsequence	Solve	Easy	Accolite+15	Dynamic Programming String+1
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
403. Frog Jump	Solve	Hard	Adobe+21	Array Dynamic Programming
404. Sum of Left Leaves	Solve	Easy	Adobe+6	Binary Tree Breadth-First Search+2
406. Queue Reconstruction by Height	Solve	Medium	Facebook	Array Binary Indexed Tree+2
408. Valid Word Abbreviation	Solve	Easy	Facebook+1	String Two Pointers
410. Split Array Largest Sum	Solve	Hard	Amazon+5	Array Binary Search+3
412. Fizz Buzz	Solve	Easy	Apple+2	Math Simulation+1
415. Add Strings	Solve	Easy	Amazon+7	Math Simulation+1
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
428. Serialize and Deserialize N-ary Tree	Solve	Hard	Amazon+7	Breadth-First Search Depth-First Search+2
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
448. Find All Numbers Disappeared in an Array	Solve	Easy	Amazon+3	Array Hash Table
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
459. Repeated Substring Pattern	Solve	Easy	Amazon+4	String String Matching
463. Island Perimeter	Solve	Easy	Amazon+2	Array Breadth-First Search+2
480. Sliding Window Median	Solve	Hard	Facebook+3	Array Hash Table+2
489. Robot Room Cleaner	Solve	Hard	Amazon+5	Backtracking Interactive
490. The Maze	Solve	Medium	Amazon+6	Array Breadth-First Search+2
494. Target Sum	Solve	Medium	Adobe+4	Array Backtracking+1