Cisco vs X Interview Questions
Cisco lists 87 LeetCode interview questions while X lists 51. They share 11 problems — 13% of Cisco's bank and 22% of X's. Focus on the overlap first, then drill into 76 Cisco-only and 40 X-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 11 overlapping problems first. These are the highest-yield questions for candidates interviewing at both Cisco and X.
Step 2 — Company-specific depth: Add Cisco-specific problems like Longest Palindromic Substring, House Robber, Predict the Winner 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
11 Shared Questions
High-priority problems to practice for both Cisco and X.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Max Points on a Line | Hard |
| Happy Number | Easy |
| Valid Parentheses | Easy |
| Trapping Rain Water | Hard |
| Reverse Linked List | Easy |
| Validate IP Address | Medium |
| Insert Delete GetRandom O(1) | Medium |
| Merge k Sorted Lists | Hard |
| Pascal's Triangle | Easy |
Unique to Cisco (76)
Problems in Cisco's list that do not appear at X.
| Problem | Difficulty |
|---|---|
| Longest Palindromic Substring | Medium |
| House Robber | Medium |
| Predict the Winner | Medium |
| Lucky Numbers in a Matrix | Easy |
| Rotate Image | Medium |
| Spiral Matrix | Medium |
| Fizz Buzz | Easy |
| Snakes and Ladders | Medium |
| Number of Valid Words in a Sentence | Easy |
| Maximum Difference Between Increasing Elements | Easy |
| Find Third Transaction | Medium |
| Implement Router | Medium |
Unique to X (40)
Problems in X's list that do not appear at Cisco.
| Problem | Difficulty |
|---|---|
| Tweet Counts Per Frequency | Medium |
| Flatten Nested List Iterator | Medium |
| Implement Trie (Prefix Tree) | 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 |
| Trapping Rain Water II | Hard |
| Finding the Users Active Minutes | Medium |
Frequently Asked Questions
How many LeetCode questions do Cisco and X share?
Cisco and X share 11 LeetCode interview questions. 76 problems appear only in Cisco's list and 40 appear only in X's list.
What topics overlap most between Cisco and X?
The most common shared topics between Cisco and X are Array (5 shared questions), Hash Table (4 shared questions), Linked List (3 shared questions), Math (3 shared questions), Design (2 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cisco or X?
Cisco has 24 Easy, 50 Medium, and 13 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 Cisco and X?
Start with the 11 shared problems since they cover what both companies ask most often. Then add 20 Cisco-specific and 20 X-specific questions to round out your prep.