Citadel vs Snap Interview Questions
Citadel lists 101 LeetCode interview questions while Snap lists 84. They share 20 problems — 20% of Citadel's bank and 24% of Snap's. Focus on the overlap first, then drill into 81 Citadel-only and 64 Snap-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 20 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Snap.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Minimum Knight Moves, Delete and Earn and Snap-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
20 Shared Questions
High-priority problems to practice for both Citadel and Snap.
| Problem | Difficulty |
|---|---|
| Binary Tree Maximum Path Sum | Hard |
| LFU Cache | Hard |
| LRU Cache | Medium |
| Evaluate Division | Medium |
| Merge Intervals | Medium |
| Number of Islands | Medium |
| Sudoku Solver | Hard |
| Group Anagrams | Medium |
| Merge k Sorted Lists | Hard |
| Combination Sum | Medium |
| Best Time to Buy and Sell Stock III | Hard |
| Letter Combinations of a Phone Number | Medium |
| Alien Dictionary | Hard |
| Word Search | Medium |
| Bus Routes | Hard |
| Basic Calculator | Hard |
| Course Schedule II | Medium |
| Course Schedule | Medium |
| Open the Lock | Medium |
| Koko Eating Bananas | Medium |
Unique to Citadel (81)
Problems in Citadel's list that do not appear at Snap.
Unique to Snap (64)
Problems in Snap's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Meeting Rooms II | Medium |
| Word Ladder | Hard |
| Minimum Window Substring | Hard |
| Design Log Storage System | Medium |
| Making A Large Island | Hard |
| Number of Distinct Islands | Medium |
| Word Break II | Hard |
| Basic Calculator II | Medium |
| Reverse Words in a String | Medium |
| Bricks Falling When Hit | Hard |
| Closest Binary Search Tree Value | Easy |
| Word Abbreviation | Hard |
Frequently Asked Questions
How many LeetCode questions do Citadel and Snap share?
Citadel and Snap share 20 LeetCode interview questions. 81 problems appear only in Citadel's list and 64 appear only in Snap's list.
What topics overlap most between Citadel and Snap?
The most common shared topics between Citadel and Snap are Array (12 shared questions), Depth-First Search (7 shared questions), Hash Table (7 shared questions), String (7 shared questions), Breadth-First Search (7 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Snap?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Snap has 5 Easy, 52 Medium, and 27 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Snap?
Start with the 20 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Snap-specific questions to round out your prep.