Citadel vs Deloitte Interview Questions
Citadel lists 101 LeetCode interview questions while Deloitte lists 43. They share 7 problems — 7% of Citadel's bank and 16% of Deloitte's. Focus on the overlap first, then drill into 94 Citadel-only and 36 Deloitte-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 7 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Deloitte.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Binary Tree Maximum Path Sum, Minimum Knight Moves and Deloitte-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
7 Shared Questions
High-priority problems to practice for both Citadel and Deloitte.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Group Anagrams | Medium |
| Merge k Sorted Lists | Hard |
| Climbing Stairs | Easy |
| 3Sum | Medium |
| Container With Most Water | Medium |
Unique to Citadel (94)
Problems in Citadel's list that do not appear at Deloitte.
Unique to Deloitte (36)
Problems in Deloitte's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Change Null Values in a Table to the Previous Value | Medium |
| Second Highest Salary | Medium |
| Valid Parentheses | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Longest Palindromic Substring | Medium |
| Longest Common Prefix | Easy |
| Palindrome Number | Easy |
| Valid Palindrome | Easy |
| Add Binary | Easy |
| Managers with at Least 5 Direct Reports | Medium |
| Minimum Time to Repair Cars | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Deloitte share?
Citadel and Deloitte share 7 LeetCode interview questions. 94 problems appear only in Citadel's list and 36 appear only in Deloitte's list.
What topics overlap most between Citadel and Deloitte?
The most common shared topics between Citadel and Deloitte are Array (5 shared questions), Sorting (3 shared questions), Dynamic Programming (2 shared questions), Two Pointers (2 shared questions), Hash Table (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Deloitte?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Deloitte has 17 Easy, 23 Medium, and 3 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Deloitte?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Deloitte-specific questions to round out your prep.