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Modern platforms (Reddit, LinkedIn, YouTube) support multiple reaction types per entity. Core Requirements ✅ One user → one reaction per entity ✅...
The Silent Cost Behind Fast Reads Indexes don’t make systems faster —they shift cost from reads to writes, memory, and latency tails. 🧠 The...
🧠 Real-World Scenario You’re building a live podcast platform where: A host starts a live podcast session. Multiple guests are invited to...
Problem: Parallel Parentheses Validator Description You are given a string s of length N consisting only of the characters '(' and ')'. A parentheses...
Feature Requirements Download File: The system should support downloading a file from a given URL using HTTP/HTTPS protocols. Segmented Downloading:...
Asked in LLD Interview Functional Requirements: Search for a Book: Users should be able to search for books in the system based on various criteria,...
