Citadel vs Hashedin Interview Questions
Citadel lists 101 LeetCode interview questions while Hashedin lists 23. They share 7 problems — 7% of Citadel's bank and 30% of Hashedin's. Focus on the overlap first, then drill into 94 Citadel-only and 16 Hashedin-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 Hashedin.
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 Hashedin-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 Hashedin.
| Problem | Difficulty |
|---|---|
| Best Time to Buy and Sell Stock | Easy |
| Number of Islands | Medium |
| Group Anagrams | Medium |
| Trapping Rain Water | Hard |
| 3Sum | Medium |
| Container With Most Water | Medium |
| Koko Eating Bananas | Medium |
Unique to Citadel (94)
Problems in Citadel's list that do not appear at Hashedin.
Unique to Hashedin (16)
Problems in Hashedin's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Find Candidates for Data Scientist Position | Easy |
| Maximize Items | Hard |
| Maximum Points Inside the Square | Medium |
| Count the Number of Powerful Integers | Hard |
| Minimize Length of Array Using Operations | Medium |
| Maximum Subarray | Medium |
| Minimum Cost to Make Array Equal | Hard |
| Next Permutation | Medium |
| Chalkboard XOR Game | Hard |
| Jump Game II | Medium |
| Edit Distance | Medium |
| Maximum Product Subarray | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Hashedin share?
Citadel and Hashedin share 7 LeetCode interview questions. 94 problems appear only in Citadel's list and 16 appear only in Hashedin's list.
What topics overlap most between Citadel and Hashedin?
The most common shared topics between Citadel and Hashedin are Array (7 shared questions), Two Pointers (3 shared questions), Dynamic Programming (2 shared questions), Sorting (2 shared questions), Depth-First Search (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Hashedin?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Hashedin has 3 Easy, 15 Medium, and 5 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Hashedin?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 16 Hashedin-specific questions to round out your prep.