Citadel vs Meta Interview Questions
Citadel lists 101 LeetCode interview questions while Meta lists 217. They share 40 problems — 40% of Citadel's bank and 18% of Meta's. Focus on the overlap first, then drill into 61 Citadel-only and 177 Meta-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 40 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Meta.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Minimum Knight Moves, Delete and Earn and Meta-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Citadel skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
40 Shared Questions
High-priority problems to practice for both Citadel and Meta.
| Problem | Difficulty |
|---|---|
| Binary Tree Maximum Path Sum | Hard |
| Palindromic Substrings | Medium |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Evaluate Reverse Polish Notation | Medium |
| Number of Islands | Medium |
| Sudoku Solver | Hard |
| Robot Room Cleaner | Hard |
| Find Median from Data Stream | Hard |
| Group Anagrams | Medium |
| Validate Binary Search Tree | Medium |
| Permutations | Medium |
| Merge k Sorted Lists | Hard |
| Binary Tree Zigzag Level Order Traversal | Medium |
| Trapping Rain Water | Hard |
| N-Queens | Hard |
| Regular Expression Matching | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Combination Sum | Medium |
| Best Time to Buy and Sell Stock III | Hard |
| Climbing Stairs | Easy |
| Letter Combinations of a Phone Number | Medium |
| Median of Two Sorted Arrays | Hard |
| Alien Dictionary | Hard |
| House Robber | Medium |
| 3Sum | Medium |
| Sqrt(x) | Easy |
| Word Search | Medium |
| Moving Average from Data Stream | Easy |
Showing top 30 of 40 shared problems.
Unique to Citadel (61)
Problems in Citadel's list that do not appear at Meta.
Unique to Meta (177)
Problems in Meta's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Minimum Remove to Make Valid Parentheses | Medium |
| Valid Word Abbreviation | Easy |
| Binary Tree Vertical Order Traversal | Medium |
| Valid Palindrome II | Easy |
| Lowest Common Ancestor of a Binary Tree III | Medium |
| Merge Sorted Array | Easy |
| Kth Largest Element in an Array | Medium |
| Binary Tree Right Side View | Medium |
| Basic Calculator II | Medium |
| Two Sum | Easy |
| Lowest Common Ancestor of a Binary Tree | Medium |
| Find Peak Element | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Meta share?
Citadel and Meta share 40 LeetCode interview questions. 61 problems appear only in Citadel's list and 177 appear only in Meta's list.
What topics overlap most between Citadel and Meta?
The most common shared topics between Citadel and Meta are Array (18 shared questions), Dynamic Programming (9 shared questions), Backtracking (7 shared questions), String (6 shared questions), Depth-First Search (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Meta?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Meta has 52 Easy, 132 Medium, and 33 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Meta?
Start with the 40 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Meta-specific questions to round out your prep.