Facebook Leetcode Questions

Understanding the type of Facebook Leetcode Questions, they frequently asked. This article will guide you through what to expect and how to prepare.

1. Overview of Facebook Company

Facebook is a social media and social networking service owned by the American technology conglomerate Meta. As of December 2023, Facebook claimed almost 3.07 billion monthly active users worldwide. As of November 2024, Facebook ranked as the third-most-visited website globally, with 23% of its traffic coming from the United States. It was the most downloaded mobile app of the 2010s.

2. Why Facebook Leetcode Questions Matter in 2025

Facebook (Meta) continues to prioritize algorithmic problem-solving in its technical interviews. Leetcode-style questions test your ability to apply data structures, optimize solutions, and think critically under pressure.

According to recently interviewed engineers, 3-4 out of 6 questions in a typical Facebook loop often align with Leetcode’s Premium company-specific lists, making targeted practice essential.

3. Top 5 Leetcode Facebook Questions to Master

1. Minimum Remove to Make Valid Parentheses – Tests string manipulation and stack logic. An example solution uses a stack to track unmatched parentheses.
2. Valid Palindrome II – Checks two-pointer skills with a twist: allowing one character deletion to form a palindrome6.
3. Lowest Common Ancestor of a Binary Tree III – Requires understanding parent pointers and cycle detection in trees6.
4. Random Pick with Weight – Involves prefix sums and binary search for weighted probability6.
5. Range Sum of BST – Tests tree traversal with conditional aggregation

4. How to Prepare for Facebook Leetcode Questions

1. Focus on Patterns, Not Problems – Recognize recurring patterns like two-pointers, monotonic stacks, or DFS/BFS traversal. Solving 300 well-chosen problems covering these patterns is ideal.
2. Leverage Leetcode Premium – The Premium “Facebook Tagged” list ranks questions by frequency and user feedback, increasing your chances of encountering familiar problems.
3. Practice Under Timed Conditions – Simulate interviews by solving medium-level problems in 30 minutes and hard ones in 60 minutes.

List of all Leetcode Problem
1. Easy Problems
2. Medium Problems
3. Hard Problems

Facebook Leetcode Questions

S.No.	Name	Level of Question	Solution
1	Binary Tree Level Order Traversal	Medium	Link
2	Combination Sum IV	Medium	Link
3	Pacific Atlantic Water Flow	Medium	Link
4	Exclusive Time of Functions	Medium	Link
5	Continuous Subarray Sum	Medium	Link
6	Target Sum	Medium	Link
7	Total Hamming Distance	Medium	Link
8	Random Pick Index	Medium	Link
9	Flatten Nested List Iterator	Medium	Link
10	Increasing Triplet Subsequence	Medium	Link
11	H Index II	Medium	Link
12	Design Add and Search Words Data Structure	Medium	Link
13	Course Schedule II	Medium	Link
14	Minimum Size Subarray Sum	Medium	Link
15	Binary Search Tree Iterator	Medium	Link
16	Clone Graph	Medium	Link
17	Longest Consecutive Sequence	Medium	Link
18	Best Time to Buy and Sell Stock with Transaction Fee	Medium	Link
19	H-Index	Medium	Link
20	Implement Trie Prefix Tree	Medium	Link
21	LRU Cache	Medium	Link
22	Populating Next Right Pointers in Each Node II	Medium	Link
23	Encode and Decode Tinyurl	Medium	Link
24	Insert Delete Getrandom O(1)	Medium	Link
25	Product of Array Except Self	Medium	Link
26	Lowest Common Ancestor of a Binary Tree	Medium	Link
27	Lowest Common Ancestor of a Binary Search Tree	Medium	Link
28	Kth Largest Element in an Array	Medium	Link
29	Number of Islands	Medium	Link
30	Word Break	Medium	Link
31	Letter Combinations of a Phone Number	Medium	Link
32	Friend Requests-II Who has the Most Friends	Medium	Link
33	Contiguous Array	Medium	Link
34	Brick Wall	Medium	Link
35	Task Scheduler	Medium	Link
36	Palindromic Substrings	Medium	Link
37	Maximum Swap	Medium	Link
38	Number of Longest Increasing Subsequence	Medium	Link
39	Accounts Merge	Medium	Link
40	Populating Next Right Pointers In Each Node II	Medium	Link
41	Remove Invalid Parentheses	Hard	Link
42	Decode Ways	Medium	Link
43	Merge Intervals	Medium	Link
44	Word Ladder	Hard	Link
45	Serialize and Deserialize Binary Tree	Hard	Link
46	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	Link
47	Decode Ways II	Hard	Link
48	Expression Add Operators	Hard	Link
49	Integer to English Words	Hard	Link
50	The Skyline Problem	Hard	Link
51	Split Array Largest Sum	Hard	Link
52	Insert Interval	Medium	Link
53	Count and Say	Medium	Link
54	Validate Binary Search Tree	Medium	Link
55	Subsets II	Medium	Link
56	Sort Colors	Medium	Link
57	Subsets	Medium	Link
58	Sqrt(x)	Easy	Link
59	Add Binary	Easy	Link
60	Simplify Path	Medium	Link
61	Minimum Window Substring	Hard	Link
62	Maximal Rectangle	Hard	Link
63	Remove Duplicates From Sorted Array II	Medium	Link
64	Merge Sorted Array	Easy	Link
65	Word Search	Medium	Link
66	Pow(x,n)	Medium	Link
67	Group Anagrams	Medium	Link
68	Wildcard Matching	Hard	Link
69	Multiply Strings	Medium	Link
70	Search in Rotated Sorted Array	Medium	Link
71	Reverse Nodes in K-Group	Hard	Link
72	Reverse Linked List	Easy	Link
73	Regular Expression Matching	Hard	Link
74	Valid Parentheses	Easy	Link
75	Merge K-Sorted Lists	Hard	Link
76	Text Justification	Hard	Link
77	Maximal Square	Medium	Link
78	3Sum	Medium	Link
79	Remove Duplicates from Sorted Array	Easy	Link
80	Two Sum	Easy	Link

FAQs

With strategic practice and the right resources, you’ll be ready to tackle Facebook’s coding challenges head-on. Happy coding! 🚀