Top 50 implementation Interview Questions

Implement a map from scratch using hash buckets, collision handling, updates, lookup, and removal.

CodingData StructuresAlgorithmsInstacartNeustarDrw

Implement an LRU API cache with TTL expiration, hit tracking, and capacity-based eviction.

apicachingData StructuresEpsilon SystemsAppleInnodata India Private

Implement FIFO queue operations using two stacks while preserving enqueue, dequeue, peek, and empty-check behavior.

QueueData StructuresAlgorithmsHsbcGro IntelligenceContinental Finance

Determine whether two MSCI labels are anagrams by comparing character frequencies in linear time.

StringsimplementationAdani Digital LabsMicrosoftSSophos

Implement a custom integer-key HashMap with chaining, resizing, updates, lookups, and deletion without using dictionaries or sets.

Data StructuresimplementationCanvaZomato

Build a singly linked list from scratch with insertion, deletion, lookup, and traversal operations.

CodingLinked ListsData StructuresJe Technology SolutionsNetskopeIntel