Citadel vs Snapchat Interview Questions
Citadel lists 101 LeetCode interview questions while Snapchat lists 99. They share 24 problems — 24% of Citadel's bank and 24% of Snapchat's. Focus on the overlap first, then drill into 77 Citadel-only and 75 Snapchat-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 24 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Snapchat.
Step 2 — Company-specific depth: Add Citadel-specific problems like Longest Non-decreasing Subarray From Two Arrays, Minimum Knight Moves, Delete and Earn and Snapchat-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
24 Shared Questions
High-priority problems to practice for both Citadel and Snapchat.
| Problem | Difficulty |
|---|---|
| Binary Tree Maximum Path Sum | Hard |
| LFU Cache | Hard |
| LRU Cache | Medium |
| Evaluate Division | Medium |
| Merge Intervals | Medium |
| Best Time to Buy and Sell Stock | Easy |
| Insert Delete GetRandom O(1) | Medium |
| Number of Islands | Medium |
| Sudoku Solver | Hard |
| Group Anagrams | Medium |
| Search Suggestions System | Medium |
| Combination Sum | Medium |
| Best Time to Buy and Sell Stock III | Hard |
| Letter Combinations of a Phone Number | Medium |
| Median of Two Sorted Arrays | Hard |
| Alien Dictionary | Hard |
| Word Search | Medium |
| Search a 2D Matrix II | 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 (77)
Problems in Citadel's list that do not appear at Snapchat.
Unique to Snapchat (75)
Problems in Snapchat's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Meeting Rooms II | Medium |
| Valid Sudoku | Medium |
| Combination Sum II | Medium |
| Wildcard Matching | Hard |
| Minimum Window Substring | Hard |
| Unique Binary Search Trees | Medium |
| Word Ladder | Hard |
| Word Break II | Hard |
| Reverse Words in a String | Medium |
| Min Stack | Medium |
| One Edit Distance | Medium |
| Reverse Linked List | Easy |
Frequently Asked Questions
How many LeetCode questions do Citadel and Snapchat share?
Citadel and Snapchat share 24 LeetCode interview questions. 77 problems appear only in Citadel's list and 75 appear only in Snapchat's list.
What topics overlap most between Citadel and Snapchat?
The most common shared topics between Citadel and Snapchat are Array (17 shared questions), Hash Table (8 shared questions), String (8 shared questions), Depth-First Search (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 Snapchat?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Snapchat has 6 Easy, 62 Medium, and 31 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Snapchat?
Start with the 24 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Snapchat-specific questions to round out your prep.