Citadel vs Visa Interview Questions
Citadel lists 101 LeetCode interview questions while Visa lists 146. They share 25 problems — 25% of Citadel's bank and 17% of Visa's. Focus on the overlap first, then drill into 76 Citadel-only and 121 Visa-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 25 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Visa.
Step 2 — Company-specific depth: Add Citadel-specific problems like Binary Tree Maximum Path Sum, Minimum Knight Moves, Delete and Earn and Visa-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
25 Shared Questions
High-priority problems to practice for both Citadel and Visa.
| Problem | Difficulty |
|---|---|
| Longest Non-decreasing Subarray From Two Arrays | Medium |
| Sliding Window Maximum | Hard |
| Count Palindromic Subsequences | Hard |
| LFU Cache | Hard |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Number of Islands | Medium |
| Find Median from Data Stream | Hard |
| Group Anagrams | Medium |
| Trapping Rain Water | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Best Time to Buy and Sell Stock III | Hard |
| Letter Combinations of a Phone Number | Medium |
| Median of Two Sorted Arrays | Hard |
| Count Ways To Build Good Strings | Medium |
| 3Sum | Medium |
| Word Search | Medium |
| Longest Common Subsequence | Medium |
| Container With Most Water | Medium |
| Longest Increasing Subsequence | Medium |
| Rotting Oranges | Medium |
| Simplify Path | Medium |
| Subarray Sums Divisible by K | Medium |
| Course Schedule | Medium |
Unique to Citadel (76)
Problems in Citadel's list that do not appear at Visa.
Unique to Visa (121)
Problems in Visa's list that do not appear at Citadel.
Frequently Asked Questions
How many LeetCode questions do Citadel and Visa share?
Citadel and Visa share 25 LeetCode interview questions. 76 problems appear only in Citadel's list and 121 appear only in Visa's list.
What topics overlap most between Citadel and Visa?
The most common shared topics between Citadel and Visa are Array (16 shared questions), Dynamic Programming (9 shared questions), String (6 shared questions), Hash Table (5 shared questions), Sorting (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Visa?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Visa has 32 Easy, 92 Medium, and 22 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Visa?
Start with the 25 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Visa-specific questions to round out your prep.