Citadel vs Zenefits Interview Questions
Citadel lists 101 LeetCode interview questions while Zenefits lists 21. They share 7 problems — 7% of Citadel's bank and 33% of Zenefits's. Focus on the overlap first, then drill into 94 Citadel-only and 14 Zenefits-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 Zenefits.
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 Zenefits-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 Zenefits.
| Problem | Difficulty |
|---|---|
| Sliding Window Maximum | Hard |
| LRU Cache | Medium |
| Number of Islands | Medium |
| Trapping Rain Water | Hard |
| Median of Two Sorted Arrays | Hard |
| Course Schedule II | Medium |
| Course Schedule | Medium |
Unique to Citadel (94)
Problems in Citadel's list that do not appear at Zenefits.
Unique to Zenefits (14)
Problems in Zenefits's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Graph Valid Tree | Medium |
| Reverse Linked List | Easy |
| Valid Parentheses | Easy |
| Generate Parentheses | Medium |
| Min Stack | Medium |
| Majority Element II | Medium |
| Excel Sheet Column Title | Easy |
| Majority Element | Easy |
| Convert Sorted List to Binary Search Tree | Medium |
| N-Queens II | Hard |
| Valid Palindrome | Easy |
| Flatten 2D Vector | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Zenefits share?
Citadel and Zenefits share 7 LeetCode interview questions. 94 problems appear only in Citadel's list and 14 appear only in Zenefits's list.
What topics overlap most between Citadel and Zenefits?
The most common shared topics between Citadel and Zenefits are Array (4 shared questions), Depth-First Search (3 shared questions), Breadth-First Search (3 shared questions), Graph (2 shared questions), Topological Sort (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Zenefits?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Zenefits has 5 Easy, 11 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 Zenefits?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 14 Zenefits-specific questions to round out your prep.