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
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
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
404. Sum of Left Leaves	Solve	Easy	Adobe+6	Binary Tree Breadth-First Search+2
408. Valid Word Abbreviation	Solve	Easy	Facebook+1	String Two Pointers
412. Fizz Buzz	Solve	Easy	Apple+2	Math Simulation+1
415. Add Strings	Solve	Easy	Amazon+7	Math Simulation+1
448. Find All Numbers Disappeared in an Array	Solve	Easy	Amazon+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
496. Next Greater Element I	Solve	Easy	Adobe+9	Array Hash Table+2
509. Fibonacci Number	Solve	Easy	Adobe+8	Dynamic Programming Math+2
543. Diameter of Binary Tree	Solve	Easy	Amazon+5	Binary Tree Depth-First Search+1
557. Reverse Words in a String III	Solve	Easy	Accolite+27	String Two Pointers
566. Reshape the Matrix	Solve	Easy	Bloomberg+1	Array Matrix+1
572. Subtree of Another Tree	Solve	Easy	Amazon+3	Binary Tree Depth-First Search+3
584. Find Customer Referee	Solve	Easy	Adobe+5	Database
595. Big Countries	Solve	Easy	Adobe+6	Database
597. Friend Requests I: Overall Acceptance Rate	Solve	Easy	Facebook	Database
605. Can Place Flowers	Solve	Easy	Amazon+4	Array Greedy
617. Merge Two Binary Trees	Solve	Easy	Amazon+3	Binary Tree Breadth-First Search+2
637. Average of Levels in Binary Tree	Solve	Easy	Amazon+2	Binary Tree Breadth-First Search+2
643. Maximum Average Subarray I	Solve	Easy	Facebook	Array Sliding Window
661. Image Smoother	Solve	Easy	Amazon+2	Array Matrix
674. Longest Continuous Increasing Subsequence	Solve	Easy	Facebook	Array
680. Valid Palindrome II	Solve	Easy	Amazon+6	Greedy String+1
703. Kth Largest Element in a Stream	Solve	Easy	Adobe+4	Binary Search Tree Binary Tree+4
704. Binary Search	Solve	Easy	Adobe+8	Array Binary Search
724. Find Pivot Index	Solve	Easy	Adobe+8	Array Prefix Sum
733. Flood Fill	Solve	Easy	Adobe+8	Array Breadth-First Search+2
734. Sentence Similarity	Solve	Easy	Facebook+1	Array Hash Table+1
746. Min Cost Climbing Stairs	Solve	Easy	Adobe+9	Array Dynamic Programming
766. Toeplitz Matrix	Solve	Easy	Bloomberg+1	Array Matrix
824. Goat Latin	Solve	Easy	Facebook	String
836. Rectangle Overlap	Solve	Easy	Docusign+2	Geometry Math
844. Backspace String Compare	Solve	Easy	Amazon+12	Simulation Stack+2
859. Buddy Strings	Solve	Easy	DoorDash+4	Hash Table String
876. Middle of the Linked List	Solve	Easy	Adobe+6	Linked List Two Pointers
884. Uncommon Words from Two Sentences	Solve	Easy	Facebook+1	Counting Hash Table+1
896. Monotonic Array	Solve	Easy	Amazon+3	Array
897. Increasing Order Search Tree	Solve	Easy	Facebook	Binary Search Tree Binary Tree+3
905. Sort Array By Parity	Solve	Easy	Amazon+11	Array Sorting+1
938. Range Sum of BST	Solve	Easy	Amazon+3	Binary Search Tree Binary Tree+2
953. Verifying an Alien Dictionary	Solve	Easy	Amazon+3	Array Hash Table+1
977. Squares of a Sorted Array	Solve	Easy	Amazon+4	Array Sorting+1
989. Add to Array-Form of Integer	Solve	Easy	Facebook	Array Math
993. Cousins in Binary Tree	Solve	Easy	Amazon+2	Binary Tree Breadth-First Search+2
1047. Remove All Adjacent Duplicates In String	Solve	Easy	Amazon+1	Stack String
1075. Project Employees I	Solve	Easy	Amazon+1	Database