Citadel vs Google Interview Questions
Citadel lists 101 LeetCode interview questions while Google lists 2,305. They share 96 problems — 95% of Citadel's bank and 4% of Google's. Focus on the overlap first, then drill into 5 Citadel-only and 2,209 Google-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 96 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Google.
Step 2 — Company-specific depth: Add Citadel-specific problems like Minimum Operations to Make Numbers Non-positive, Number of Good Binary Strings, Best Position for a Service Centre and Google-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
96 Shared Questions
High-priority problems to practice for both Citadel and Google.
Showing top 30 of 96 shared problems.
Unique to Citadel (5)
Problems in Citadel's list that do not appear at Google.
Unique to Google (2,209)
Problems in Google's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Two Sum | Easy |
| Add Two Numbers | Medium |
| Longest Common Prefix | Easy |
| Palindrome Number | Easy |
| Merge Sorted Array | Easy |
| Longest Substring Without Repeating Characters | Medium |
| Create Hello World Function | Easy |
| Merge Strings Alternately | Easy |
| Longest Palindromic Substring | Medium |
| Longest Consecutive Sequence | Medium |
| Recyclable and Low Fat Products | Easy |
| Valid Parentheses | Easy |
Frequently Asked Questions
How many LeetCode questions do Citadel and Google share?
Citadel and Google share 96 LeetCode interview questions. 5 problems appear only in Citadel's list and 2209 appear only in Google's list.
What topics overlap most between Citadel and Google?
The most common shared topics between Citadel and Google are Array (20 shared questions), Dynamic Programming (10 shared questions), Hash Table (9 shared questions), Two Pointers (6 shared questions), Sorting (6 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Google?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Google has 601 Easy, 1205 Medium, and 499 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Google?
Start with the 96 shared problems since they cover what both companies ask most often. Then add 5 Citadel-specific and 20 Google-specific questions to round out your prep.