Citadel vs NVIDIA Interview Questions
Citadel lists 101 LeetCode interview questions while NVIDIA lists 136. They share 32 problems — 32% of Citadel's bank and 24% of NVIDIA's. Focus on the overlap first, then drill into 69 Citadel-only and 104 NVIDIA-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 32 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and NVIDIA.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Binary Tree Maximum Path Sum, Delete and Earn and NVIDIA-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
32 Shared Questions
High-priority problems to practice for both Citadel and NVIDIA.
| Problem | Difficulty |
|---|---|
| Minimum Knight Moves | Medium |
| Sliding Window Maximum | Hard |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Find the Duplicate Number | Medium |
| Serialize and Deserialize Binary Tree | Hard |
| Insert Delete GetRandom O(1) | Medium |
| Number of Islands | Medium |
| Find Median from Data Stream | Hard |
| Group Anagrams | Medium |
| Merge k Sorted Lists | Hard |
| Trapping Rain Water | Hard |
| Design Circular Queue | Medium |
| Fizz Buzz | Easy |
| Climbing Stairs | Easy |
| Median of Two Sorted Arrays | Hard |
| Maximal Square | Medium |
| House Robber | Medium |
| 3Sum | Medium |
| Sqrt(x) | Easy |
| Asteroid Collision | Medium |
| Container With Most Water | Medium |
| Max Points on a Line | Hard |
| Pow(x, n) | Medium |
| Longest Increasing Subsequence | Medium |
| Rotting Oranges | Medium |
| The Skyline Problem | Hard |
| Simplify Path | Medium |
| Course Schedule II | Medium |
Showing top 30 of 32 shared problems.
Unique to Citadel (69)
Problems in Citadel's list that do not appear at NVIDIA.
Unique to NVIDIA (104)
Problems in NVIDIA's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Special Binary String | Hard |
| Longest Substring Without Repeating Characters | Medium |
| Two Sum | Easy |
| Valid Parentheses | Easy |
| Minimum Operations to Reduce an Integer to 0 | Medium |
| Last Stone Weight | Easy |
| Maximum Subarray | Medium |
| Maximize Greatness of an Array | Medium |
| Maximum Number of Visible Points | Hard |
| Restore IP Addresses | Medium |
| Search in Rotated Sorted Array | Medium |
| Reverse Bits | Easy |
Frequently Asked Questions
How many LeetCode questions do Citadel and NVIDIA share?
Citadel and NVIDIA share 32 LeetCode interview questions. 69 problems appear only in Citadel's list and 104 appear only in NVIDIA's list.
What topics overlap most between Citadel and NVIDIA?
The most common shared topics between Citadel and NVIDIA are Array (19 shared questions), Dynamic Programming (6 shared questions), Math (6 shared questions), Breadth-First Search (5 shared questions), Design (5 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or NVIDIA?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. NVIDIA has 32 Easy, 89 Medium, and 15 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and NVIDIA?
Start with the 32 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 NVIDIA-specific questions to round out your prep.