Question 1

How many LeetCode questions does MongoDB ask in interviews?

Accepted Answer

MongoDB has 24 known LeetCode interview questions. The difficulty breakdown is 3 Easy, 15 Medium, and 6 Hard problems.

Question 2

What are the most common topics in MongoDB coding interviews?

Accepted Answer

The most frequently asked topics at MongoDB are Hash Table (10 questions), Array (9 questions), String (7 questions), Design (6 questions), Depth-First Search (6 questions). Focus on these topics to maximize your preparation.

Question 3

How should I prepare for a MongoDB coding interview?

Accepted Answer

Start with the most frequently asked MongoDB problems on CodeJeet, sorted by frequency. Focus on Medium difficulty first since MongoDB asks 15 Medium problems. Practice the top topics: Hash Table, Array, String.

Title	Difficulty	Acceptance	Frequency	Topics
Word Break	Medium	49.1%	100.0%	ArrayHash TableString+3
Implement Trie (Prefix Tree)	Medium	69.2%	100.0%	Hash TableStringDesign+1
Snapshot Array	Medium	36.7%	97.1%	ArrayHash TableBinary Search+1
Intersection of Two Arrays	Easy	77.5%	97.1%	ArrayHash TableTwo Pointers+2
Text Justification	Hard	50.5%	85.4%	ArrayStringSimulation
Merge k Sorted Lists	Hard	58.9%	85.4%	Linked ListDivide and ConquerHeap (Priority Queue)+1
LRU Cache	Medium	46.8%	79.8%	Hash TableLinked ListDesign+1
Convert JSON String to Object	Hard	61.1%	79.8%
Merge Intervals	Medium	51.2%	72.6%	ArraySorting
Insert Interval	Medium	44.8%	72.6%	Array
Web Crawler Multithreaded	Medium	51.0%	72.6%	Depth-First SearchBreadth-First SearchConcurrency
Stock Price Fluctuation	Medium	48.9%	72.6%	Hash TableDesignHeap (Priority Queue)+2
Course Schedule II	Medium	55.0%	72.6%	Depth-First SearchBreadth-First SearchGraph Theory+1
Merge Two Binary Trees	Easy	79.0%	62.6%	TreeDepth-First SearchBreadth-First Search+1
Sliding Window Maximum	Hard	48.5%	62.6%	ArrayQueueSliding Window+2
Lowest Common Ancestor of a Binary Tree	Medium	68.8%	62.6%	TreeDepth-First SearchBinary Tree
Design Search Autocomplete System	Hard	49.7%	62.6%	StringDepth-First SearchDesign+4
Lowest Common Ancestor of a Binary Tree III	Medium	82.9%	62.6%	Hash TableTwo PointersTree+1
String Compression	Medium	59.6%	62.6%	Two PointersString
Search in Rotated Sorted Array	Medium	44.1%	62.6%	ArrayBinary Search
Word Break II	Hard	55.1%	62.6%	ArrayHash TableString+4
Merge Two Sorted Lists	Easy	68.0%	62.6%	Linked ListRecursion
Clone Graph	Medium	64.7%	62.6%	Hash TableDepth-First SearchBreadth-First Search+1
Time Based Key-Value Store	Medium	49.7%	62.6%	Hash TableStringBinary Search+1

MongoDB

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