Citadel vs LinkedIn Interview Questions
Citadel lists 101 LeetCode interview questions while LinkedIn lists 141. They share 30 problems — 30% of Citadel's bank and 21% of LinkedIn's. Focus on the overlap first, then drill into 71 Citadel-only and 111 LinkedIn-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 30 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and LinkedIn.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Binary Tree Maximum Path Sum, Delete and Earn and LinkedIn-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
30 Shared Questions
High-priority problems to practice for both Citadel and LinkedIn.
| Problem | Difficulty |
|---|---|
| Minimum Knight Moves | Medium |
| Palindromic Substrings | Medium |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Serialize and Deserialize Binary Tree | Hard |
| Insert Delete GetRandom O(1) | Medium |
| Evaluate Reverse Polish Notation | Medium |
| Number of Islands | Medium |
| Robot Room Cleaner | Hard |
| Validate Binary Search Tree | Medium |
| Permutations | Medium |
| Merge k Sorted Lists | Hard |
| Binary Tree Zigzag Level Order Traversal | Medium |
| Fizz Buzz | Easy |
| Combination Sum | Medium |
| Letter Combinations of a Phone Number | Medium |
| Median of Two Sorted Arrays | Hard |
| House Robber | Medium |
| Sqrt(x) | Easy |
| Moving Average from Data Stream | Easy |
| Insert Delete GetRandom O(1) - Duplicates allowed | Hard |
| Word Ladder II | Hard |
| Paint House | Medium |
| Max Points on a Line | Hard |
| Pow(x, n) | Medium |
| Permutations II | Medium |
| Course Schedule II | Medium |
| Koko Eating Bananas | Medium |
| Integer to Roman | Medium |
Unique to Citadel (71)
Problems in Citadel's list that do not appear at LinkedIn.
Unique to LinkedIn (111)
Problems in LinkedIn's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Max Stack | Hard |
| Nested List Weight Sum II | Medium |
| All O`one Data Structure | Hard |
| Word Ladder | Hard |
| Find the Celebrity | Medium |
| Nested List Weight Sum | Medium |
| Design Authentication Manager | Medium |
| Find Leaves of Binary Tree | Medium |
| Shortest Word Distance II | Medium |
| Maximum Subarray | Medium |
| Max Consecutive Ones III | Medium |
| Valid Parentheses | Easy |
Frequently Asked Questions
How many LeetCode questions do Citadel and LinkedIn share?
Citadel and LinkedIn share 30 LeetCode interview questions. 71 problems appear only in Citadel's list and 111 appear only in LinkedIn's list.
What topics overlap most between Citadel and LinkedIn?
The most common shared topics between Citadel and LinkedIn are Array (15 shared questions), Math (8 shared questions), Hash Table (7 shared questions), Breadth-First Search (6 shared questions), String (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or LinkedIn?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. LinkedIn has 25 Easy, 90 Medium, and 26 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and LinkedIn?
Start with the 30 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 LinkedIn-specific questions to round out your prep.