Capital One vs X Interview Questions
Capital One lists 47 LeetCode interview questions while X lists 51. They share 4 problems — 9% of Capital One's bank and 8% of X's. Focus on the overlap first, then drill into 43 Capital One-only and 47 X-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 4 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Capital One and X.
Step 2 — Company-specific depth: Add Capital One-specific problems like Simple Bank System, Spiral Matrix, Block Placement Queries and X-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: X skews harder in our data. Budget extra time for Hard problems if you are targeting that company.
Difficulty Comparison
Top Shared Topics
4 Shared Questions
High-priority problems to practice for both Capital One and X.
| Problem | Difficulty |
|---|---|
| Number of Black Blocks | Medium |
| Merge Intervals | Medium |
| LRU Cache | Medium |
| Valid Parentheses | Easy |
Unique to Capital One (43)
Problems in Capital One's list that do not appear at X.
| Problem | Difficulty |
|---|---|
| Simple Bank System | Medium |
| Spiral Matrix | Medium |
| Block Placement Queries | Hard |
| Text Justification | Hard |
| Minimum Operations to Write the Letter Y on a Grid | Medium |
| Candy Crush | Medium |
| Count Alternating Subarrays | Medium |
| Rotate Image | Medium |
| Four Divisors | Medium |
| Simplify Path | Medium |
| Count Operations to Obtain Zero | Easy |
| Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Medium |
Unique to X (47)
Problems in X's list that do not appear at Capital One.
| Problem | Difficulty |
|---|---|
| Trapping Rain Water | Hard |
| Tweet Counts Per Frequency | Medium |
| Flatten Nested List Iterator | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Design Twitter | Medium |
| Binary Gap | Easy |
| Regular Expression Matching | Hard |
| Integer to Roman | Medium |
| Word Break II | Hard |
| Alien Dictionary | Hard |
| Time Needed to Buy Tickets | Easy |
Frequently Asked Questions
How many LeetCode questions do Capital One and X share?
Capital One and X share 4 LeetCode interview questions. 43 problems appear only in Capital One's list and 47 appear only in X's list.
What topics overlap most between Capital One and X?
The most common shared topics between Capital One and X are Array (2 shared questions), Hash Table (2 shared questions), Enumeration (1 shared questions), Sorting (1 shared questions), Linked List (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Capital One or X?
Capital One has 9 Easy, 28 Medium, and 10 Hard questions. X has 8 Easy, 31 Medium, and 12 Hard questions. X has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Capital One and X?
Start with the 4 shared problems since they cover what both companies ask most often. Then add 20 Capital One-specific and 20 X-specific questions to round out your prep.