Citadel vs Infosys Interview Questions
Citadel lists 101 LeetCode interview questions while Infosys lists 105. They share 17 problems — 17% of Citadel's bank and 16% of Infosys's. Focus on the overlap first, then drill into 84 Citadel-only and 88 Infosys-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 17 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Infosys.
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 Infosys-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
17 Shared Questions
High-priority problems to practice for both Citadel and Infosys.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Find the Duplicate Number | Medium |
| Number of Islands | Medium |
| Group Anagrams | Medium |
| Trapping Rain Water | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Combination Sum | Medium |
| Climbing Stairs | Easy |
| Median of Two Sorted Arrays | Hard |
| House Robber | Medium |
| 3Sum | Medium |
| Sqrt(x) | Easy |
| Container With Most Water | Medium |
| Pow(x, n) | Medium |
| Koko Eating Bananas | Medium |
| Integer to Roman | Medium |
Unique to Citadel (84)
Problems in Citadel's list that do not appear at Infosys.
Unique to Infosys (88)
Problems in Infosys's list that do not appear at Citadel.
Frequently Asked Questions
How many LeetCode questions do Citadel and Infosys share?
Citadel and Infosys share 17 LeetCode interview questions. 84 problems appear only in Citadel's list and 88 appear only in Infosys's list.
What topics overlap most between Citadel and Infosys?
The most common shared topics between Citadel and Infosys are Array (13 shared questions), Dynamic Programming (5 shared questions), Two Pointers (4 shared questions), Binary Search (4 shared questions), Math (4 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Infosys?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Infosys has 32 Easy, 57 Medium, and 16 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Infosys?
Start with the 17 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Infosys-specific questions to round out your prep.