Cisco vs Twitter Interview Questions
Cisco lists 87 LeetCode interview questions while Twitter lists 53. They share 11 problems — 13% of Cisco's bank and 21% of Twitter's. Focus on the overlap first, then drill into 76 Cisco-only and 42 Twitter-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 Twitter.
Step 2 — Company-specific depth: Add Cisco-specific problems like Longest Palindromic Substring, House Robber, Predict the Winner and Twitter-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: Twitter 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 Twitter.
| 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 Twitter.
| 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 Twitter (42)
Problems in Twitter's list that do not appear at Cisco.
| Problem | Difficulty |
|---|---|
| Regular Expression Matching | Hard |
| Integer to Roman | Medium |
| Multiply Strings | Medium |
| Wildcard Matching | Hard |
| Permutation Sequence | Hard |
| Word Break II | Hard |
| Time Needed to Buy Tickets | Easy |
| One Edit Distance | Medium |
| Implement Trie (Prefix Tree) | Medium |
| The Skyline Problem | Hard |
| Lowest Common Ancestor of a Binary Search Tree | Medium |
| Flatten 2D Vector | Medium |
Frequently Asked Questions
How many LeetCode questions do Cisco and Twitter share?
Cisco and Twitter share 11 LeetCode interview questions. 76 problems appear only in Cisco's list and 42 appear only in Twitter's list.
What topics overlap most between Cisco and Twitter?
The most common shared topics between Cisco and Twitter 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 Twitter?
Cisco has 24 Easy, 50 Medium, and 13 Hard questions. Twitter has 8 Easy, 33 Medium, and 12 Hard questions. Twitter has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cisco and Twitter?
Start with the 11 shared problems since they cover what both companies ask most often. Then add 20 Cisco-specific and 20 Twitter-specific questions to round out your prep.