Bloomberg vs Citadel Interview Questions
Bloomberg lists 1,200 LeetCode interview questions while Citadel lists 101. They share 79 problems — 7% of Bloomberg's bank and 78% of Citadel's. Focus on the overlap first, then drill into 1,121 Bloomberg-only and 22 Citadel-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 79 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Bloomberg and Citadel.
Step 2 — Company-specific depth: Add Bloomberg-specific problems like Two Sum, Add Two Numbers, Longest Substring Without Repeating Characters and Citadel-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
79 Shared Questions
High-priority problems to practice for both Bloomberg and Citadel.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Number of Islands | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Trapping Rain Water | Hard |
| 3Sum | Medium |
| Word Search | Medium |
| Median of Two Sorted Arrays | Hard |
| Container With Most Water | Medium |
| LRU Cache | Medium |
| Group Anagrams | Medium |
| Climbing Stairs | Easy |
| Validate Binary Search Tree | Medium |
| Koko Eating Bananas | Medium |
| Sqrt(x) | Easy |
| Pow(x, n) | Medium |
| Evaluate Division | Medium |
| House Robber | Medium |
| Merge k Sorted Lists | Hard |
| Rotting Oranges | Medium |
| Best Time to Buy and Sell Stock II | Medium |
| N-Queens | Hard |
| Letter Combinations of a Phone Number | Medium |
| Combination Sum | Medium |
| Longest Increasing Subsequence | Medium |
| Find the Duplicate Number | Medium |
| Populating Next Right Pointers in Each Node | Medium |
| Integer to Roman | Medium |
| Regular Expression Matching | Hard |
| Binary Tree Zigzag Level Order Traversal | Medium |
Showing top 30 of 79 shared problems.
Unique to Bloomberg (1,121)
Problems in Bloomberg's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Add Two Numbers | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Valid Parentheses | Easy |
| Longest Palindromic Substring | Medium |
| Invalid Transactions | Medium |
| Longest Common Prefix | Easy |
| Flatten a Multilevel Doubly Linked List | Medium |
| Majority Element | Easy |
| Reverse Integer | Medium |
| Decode String | Medium |
| Merge Sorted Array | Easy |
Unique to Citadel (22)
Problems in Citadel's list that do not appear at Bloomberg.
Frequently Asked Questions
How many LeetCode questions do Bloomberg and Citadel share?
Bloomberg and Citadel share 79 LeetCode interview questions. 1121 problems appear only in Bloomberg's list and 22 appear only in Citadel's list.
What topics overlap most between Bloomberg and Citadel?
The most common shared topics between Bloomberg and Citadel are Array (19 shared questions), Dynamic Programming (7 shared questions), String (6 shared questions), Hash Table (5 shared questions), Math (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Bloomberg or Citadel?
Bloomberg has 395 Easy, 645 Medium, and 160 Hard questions. Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Bloomberg and Citadel?
Start with the 79 shared problems since they cover what both companies ask most often. Then add 20 Bloomberg-specific and 20 Citadel-specific questions to round out your prep.