Citadel vs Grammarly Interview Questions
Citadel lists 101 LeetCode interview questions while Grammarly lists 30. They share 9 problems — 9% of Citadel's bank and 30% of Grammarly's. Focus on the overlap first, then drill into 92 Citadel-only and 21 Grammarly-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 9 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Citadel and Grammarly.
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 Grammarly-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
9 Shared Questions
High-priority problems to practice for both Citadel and Grammarly.
| Problem | Difficulty |
|---|---|
| Merge Intervals | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Evaluate Reverse Polish Notation | Medium |
| Number of Islands | Medium |
| Trapping Rain Water | Hard |
| Implement Trie (Prefix Tree) | Medium |
| Climbing Stairs | Easy |
| Sqrt(x) | Easy |
| Word Search | Medium |
Unique to Citadel (92)
Problems in Citadel's list that do not appear at Grammarly.
Unique to Grammarly (21)
Problems in Grammarly's list that do not appear at Citadel.
| Problem | Difficulty |
|---|---|
| Remove All Adjacent Duplicates In String | Easy |
| Search in Rotated Sorted Array | Medium |
| Vowel Spellchecker | Medium |
| Remove All Adjacent Duplicates in String II | Medium |
| Repeated DNA Sequences | Medium |
| Generate Parentheses | Medium |
| Perfect Number | Easy |
| Logger Rate Limiter | Easy |
| Sum of Left Leaves | Easy |
| Non-overlapping Intervals | Medium |
| Search Insert Position | Easy |
| Two Best Non-Overlapping Events | Medium |
Frequently Asked Questions
How many LeetCode questions do Citadel and Grammarly share?
Citadel and Grammarly share 9 LeetCode interview questions. 92 problems appear only in Citadel's list and 21 appear only in Grammarly's list.
What topics overlap most between Citadel and Grammarly?
The most common shared topics between Citadel and Grammarly are Array (6 shared questions), Math (4 shared questions), Hash Table (2 shared questions), Design (2 shared questions), Stack (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Citadel or Grammarly?
Citadel has 5 Easy, 60 Medium, and 36 Hard questions. Grammarly has 7 Easy, 19 Medium, and 4 Hard questions. Citadel has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Citadel and Grammarly?
Start with the 9 shared problems since they cover what both companies ask most often. Then add 20 Citadel-specific and 20 Grammarly-specific questions to round out your prep.