Citadel vs Intel Interview Questions
Citadel lists 101 LeetCode interview questions while Intel lists 25. They share 7 problems — 7% of Citadel's bank and 28% of Intel's. Focus on the overlap first, then drill into 94 Citadel-only and 18 Intel-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 Intel.
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 Intel-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 Intel.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Number of Islands | Medium |
| Trapping Rain Water | Hard |
| Best Time to Buy and Sell Stock II | Medium |
| Climbing Stairs | Easy |
| Container With Most Water | Medium |
Unique to Citadel (94)
Problems in Citadel's list that do not appear at Intel.
Unique to Intel (18)
Problems in Intel's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Find Consecutive Integers from a Data Stream | Medium |
| Maximum Nesting Depth of the Parentheses | Easy |
| Valid Parentheses | Easy |
| Copy List with Random Pointer | Medium |
| Two Sum | Easy |
| Count Primes | Medium |
| Longest Substring Without Repeating Characters | Medium |
| Reverse Integer | Medium |
| Maximum Subarray | Medium |
| Merge Two Sorted Lists | Easy |
| Reverse Words in a String | Medium |
| Add Two Numbers | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Intel share?
Citadel and Intel share 7 LeetCode interview questions. 94 problems appear only in Citadel's list and 18 appear only in Intel's list.
What topics overlap most between Citadel and Intel?
The most common shared topics between Citadel and Intel are Array (5 shared questions), Dynamic Programming (4 shared questions), Two Pointers (2 shared questions), Greedy (2 shared questions), Hash Table (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Intel?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Intel has 10 Easy, 14 Medium, and 1 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Intel?
Start with the 7 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 18 Intel-specific questions to round out your prep.