MongoDB vs TCS Interview Questions
MongoDB lists 24 LeetCode interview questions while TCS lists 228. They share 8 problems — 33% of MongoDB's bank and 4% of TCS's. Focus on the overlap first, then drill into 16 MongoDB-only and 220 TCS-only questions.
Overview
Preparation Strategy
Step 1 — Shared core: Solve the 8 overlapping problems first. These are the highest-yield questions for candidates interviewing at both MongoDB and TCS.
Step 2 — Company-specific depth: Add MongoDB-specific problems like Word Break, Implement Trie (Prefix Tree), Snapshot Array and TCS-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
8 Shared Questions
High-priority problems to practice for both MongoDB and TCS.
| Problem | Difficulty |
|---|---|
| Merge k Sorted Lists | Hard |
| LRU Cache | Medium |
| Merge Intervals | Medium |
| Insert Interval | Medium |
| Sliding Window Maximum | Hard |
| String Compression | Medium |
| Search in Rotated Sorted Array | Medium |
| Merge Two Sorted Lists | Easy |
Unique to MongoDB (16)
Problems in MongoDB's list that do not appear at TCS.
| 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 |
| 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 |
| Design Search Autocomplete System | Hard |
Unique to TCS (220)
Problems in TCS's list that do not appear at MongoDB.
| Problem | Difficulty |
|---|---|
| Friday Purchases I | Medium |
| Two Sum | Easy |
| Longest Palindromic Substring | Medium |
| Palindrome Number | Easy |
| Maximum Subarray | Medium |
| Move Zeroes | Easy |
| Majority Element | Easy |
| Longest Common Prefix | Easy |
| Best Time to Buy and Sell Stock | Easy |
| Sort Colors | Medium |
| Valid Anagram | Easy |
| Find the Index of the First Occurrence in a String | Easy |
Frequently Asked Questions
How many LeetCode questions do MongoDB and TCS share?
MongoDB and TCS share 8 LeetCode interview questions. 16 problems appear only in MongoDB's list and 220 appear only in TCS's list.
What topics overlap most between MongoDB and TCS?
The most common shared topics between MongoDB and TCS are Array (4 shared questions), Linked List (3 shared questions), Heap (Priority Queue) (2 shared questions), Divide and Conquer (1 shared questions), Merge Sort (1 shared questions). Mastering these areas prepares you for both companies.
Which company asks harder LeetCode questions: MongoDB or TCS?
MongoDB has 3 Easy, 15 Medium, and 6 Hard questions. TCS has 99 Easy, 108 Medium, and 21 Hard questions. MongoDB has a higher proportion of Hard problems in its interview set.
How should I prepare if interviewing at both MongoDB and TCS?
Start with the 8 shared problems since they cover what both companies ask most often. Then add 16 MongoDB-specific and 20 TCS-specific questions to round out your prep.