Citadel vs Zeta Interview Questions
Citadel lists 101 LeetCode interview questions while Zeta lists 30. They share 6 problems — 6% of Citadel's bank and 20% of Zeta's. Focus on the overlap first, then drill into 95 Citadel-only and 24 Zeta-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 6 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Zeta.
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 Zeta-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
6 Shared Questions
High-priority problems to practice for both Citadel and Zeta.
| Problem | Difficulty |
|---|---|
| Sliding Window Maximum | Hard |
| Merge Intervals | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Trapping Rain Water | Hard |
| Median of Two Sorted Arrays | Hard |
| House Robber | Medium |
Unique to Citadel (95)
Problems in Citadel's list that do not appear at Zeta.
Unique to Zeta (24)
Problems in Zeta's list that do not appear at Citadel.
Frequently Asked Questions
How many LeetCode questions do Citadel and Zeta share?
Citadel and Zeta share 6 LeetCode interview questions. 95 problems appear only in Citadel's list and 24 appear only in Zeta's list.
What topics overlap most between Citadel and Zeta?
The most common shared topics between Citadel and Zeta are Array (6 shared questions), Dynamic Programming (2 shared questions), Queue (1 shared questions), Sliding Window (1 shared questions), Heap (Priority Queue) (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Zeta?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Zeta has 0 Easy, 20 Medium, and 10 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Zeta?
Start with the 6 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Zeta-specific questions to round out your prep.