Cisco vs MongoDB Interview Questions
Cisco lists 87 LeetCode interview questions while MongoDB lists 24. They share 4 problems — 5% of Cisco's bank and 17% of MongoDB's. Focus on the overlap first, then drill into 83 Cisco-only and 20 MongoDB-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 Cisco and MongoDB.
Step 2 — Company-specific depth: Add Cisco-specific problems like Longest Palindromic Substring, House Robber, Predict the Winner and MongoDB-specific problems from the exclusive lists below.
Step 3 — Difficulty tuning: MongoDB 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 Cisco and MongoDB.
| Problem | Difficulty |
|---|---|
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Merge k Sorted Lists | Hard |
| Sliding Window Maximum | Hard |
Unique to Cisco (83)
Problems in Cisco's list that do not appear at MongoDB.
| 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 MongoDB (20)
Problems in MongoDB's list that do not appear at Cisco.
| Problem | Difficulty |
|---|---|
| Word Break | Medium |
| Implement Trie (Prefix Tree) | Medium |
| Snapshot Array | Medium |
| Intersection of Two Arrays | Easy |
| Text Justification | Hard |
| Convert JSON String to Object | Hard |
| Insert Interval | Medium |
| Web Crawler Multithreaded | Medium |
| Stock Price Fluctuation | Medium |
| Course Schedule II | Medium |
| Merge Two Binary Trees | Easy |
| Lowest Common Ancestor of a Binary Tree | Medium |
Frequently Asked Questions
How many LeetCode questions do Cisco and MongoDB share?
Cisco and MongoDB share 4 LeetCode interview questions. 83 problems appear only in Cisco's list and 20 appear only in MongoDB's list.
What topics overlap most between Cisco and MongoDB?
The most common shared topics between Cisco and MongoDB are Linked List (2 shared questions), Array (2 shared questions), Heap (Priority Queue) (2 shared questions), Hash Table (1 shared questions), Design (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: Cisco or MongoDB?
Cisco has 24 Easy, 50 Medium, and 13 Hard questions. MongoDB has 3 Easy, 15 Medium, and 6 Hard questions. MongoDB has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both Cisco and MongoDB?
Start with the 4 shared problems since they cover what both companies ask most often. Then add 20 Cisco-specific and 20 MongoDB-specific questions to round out your prep.