Citadel vs Coupang Interview Questions
Citadel lists 101 LeetCode interview questions while Coupang lists 49. They share 13 problems — 13% of Citadel's bank and 27% of Coupang's. Focus on the overlap first, then drill into 88 Citadel-only and 36 Coupang-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 13 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Coupang.
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 Coupang-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
13 Shared Questions
High-priority problems to practice for both Citadel and Coupang.
| Problem | Difficulty |
|---|---|
| Sliding Window Maximum | Hard |
| LFU Cache | Hard |
| LRU Cache | Medium |
| Number of Islands | Medium |
| Find Median from Data Stream | Hard |
| Group Anagrams | Medium |
| Regular Expression Matching | Hard |
| Search a 2D Matrix II | Medium |
| Reorganize String | Medium |
| Bus Routes | Hard |
| Basic Calculator | Hard |
| Course Schedule | Medium |
| Open the Lock | Medium |
Unique to Citadel (88)
Problems in Citadel's list that do not appear at Coupang.
Unique to Coupang (36)
Problems in Coupang's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Word Break | Medium |
| Subsets | Medium |
| Decode String | Medium |
| Longest Substring with At Most K Distinct Characters | Medium |
| Split BST | Medium |
| Range Module | Hard |
| Find Pivot Index | Easy |
| Design In-Memory File System | Hard |
| Unique Paths II | Medium |
| Design Twitter | Medium |
| Shopping Offers | Medium |
| Longest Repeating Substring | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Coupang share?
Citadel and Coupang share 13 LeetCode interview questions. 88 problems appear only in Citadel's list and 36 appear only in Coupang's list.
What topics overlap most between Citadel and Coupang?
The most common shared topics between Citadel and Coupang are Array (6 shared questions), Hash Table (6 shared questions), String (5 shared questions), Breadth-First Search (4 shared questions), Heap (Priority Queue) (3 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Coupang?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Coupang has 2 Easy, 33 Medium, and 14 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Coupang?
Start with the 13 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Coupang-specific questions to round out your prep.