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Top 50 Algorithms Interview Questions

The most frequently asked Algorithms questions across all roles and companies, ranked by real interview frequency. Updated weekly.

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Check Whether Two Strings Are Anagrams
Easy

Use a hash map of character counts to determine whether two strings are anagrams in linear time.

Hash TablesStringsSorting
Recently asked
AmazonMeta ITWalmart
Analyzing Recursive Time Complexity
Medium

Explain Big O notation and how to analyze the time and space complexity of recursive algorithms.

Recursiontime complexityAlgorithms
Recently asked
StackadaptPrudential Ins Co Of America In
Reverse Nodes in K Groups
Medium

Problem Given the head of a singly linked list and an integer k, reverse the nodes of the list k at a time and return the modified head. If the number of ...

Linked ListsAlgorithmsedge cases
Recently asked
Lucid MotorsPlangrid
Dynamic Shortest Paths with Updates
Hard

Maintain a dynamic weighted graph and recompute shortest path after each edge update using Dijkstra and a min-heap.

shortest pathAlgorithmsGraphs
Recently asked
Palantir technologies
Shortest Path in Weighted Graph
Hard

Use Dijkstra’s algorithm with a priority queue to find the shortest path in a weighted graph with non-negative edges.

shortest pathAlgorithmsGraphs
Recently asked
Swiggy
In-Memory Store with TTL
Easy

Implement an in-memory key-value store with TTL using a hash map and min-heap for efficient expiration.

Hash TablesData StructuresAlgorithms
Recently asked
Ramp
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