Tree Dynamic Programming Interview Patterns: Diameter, Path Sum & House Robber
Tree Dynamic Programming Interview Patterns Tree DP combines tree traversal with dynamic programming. The key insight: the answer for a […]
Algorithms
System Design
System Design Interview: Design a Real-Time Leaderboard
System Design: Design a Real-Time Leaderboard (Gaming / Competitive Apps) Real-time leaderboards appear in gaming, coding competitions, e-commerce flash sales,
System Design
System Design Interview: Design a Ticket Booking System (Ticketmaster)
System Design: Design a Ticket Booking System (Ticketmaster/Fandango) A ticket booking system is a classic system design problem involving seat
Algorithms
Advanced Binary Search Interview Patterns: Rotated Array, Search on Answer
Advanced Binary Search Interview Patterns Binary search goes far beyond searching a sorted array. The key insight: whenever you can
Algorithms
Stack Interview Patterns: Parentheses, Calculator, Histogram & Min Stack
Stack Interview Patterns: Parentheses, Calculator, Histogram & More Beyond the monotonic stack, there are several classic stack patterns that appear
Algorithms
Two Pointers and Sliding Window Interview Patterns: Complete Guide
Two Pointers and Sliding Window Interview Patterns Two-pointer techniques transform O(n²) brute-force solutions into O(n) elegant ones. They are among
System Design
System Design Interview: Design a Key-Value Store (Redis/DynamoDB)
System Design: Design a Key-Value Store (like Redis or DynamoDB) A key-value store is the simplest and most widely-used NoSQL
Algorithms
Trie Data Structure Interview Patterns: Autocomplete, Word Search & XOR
Trie Data Structure Interview Patterns: Autocomplete, Word Search & Prefix Problems A Trie (prefix tree) is the go-to data structure
System Design
System Design Interview: Design a Load Balancer
System Design: Load Balancer — How to Design Traffic Distribution at Scale Load balancers are one of the most fundamental
Algorithms
Graph Algorithms Interview Patterns: BFS, DFS, Dijkstra & Cycle Detection
Graph Algorithms Interview Patterns: BFS, DFS, Dijkstra & More Graph problems appear in roughly 25% of FAANG algorithm interviews. Mastering
Algorithms
Math and Number Theory Interview Patterns: GCD, Primes, Modular Arithmetic
Why Math in Coding Interviews? Math problems appear in interviews at all levels — they test logical reasoning and knowledge
System Design
System Design Interview: API Design (REST vs GraphQL vs gRPC)
Why API Design Matters in Interviews API design questions appear in senior system design interviews: “Design the Twitter API,” “Design
System Design
Database Indexing Interview Guide: B-Trees, Composite Indexes, Query Optimization
Why Indexes Matter A database index is a data structure that enables fast lookup of rows without scanning the entire
System Design
System Design Interview: Multi-Region Architecture and Global Replication
Why Multi-Region? Single-region deployments have two problems: (1) Latency — a user in Tokyo making a request to a US-East
Algorithms
Concurrency Interview Patterns: Locks, Thread Safety, Producer-Consumer
Why Concurrency in Interviews? Concurrency problems appear at senior-level interviews (SDE-2 and above) at companies like Apple, Google, and Databricks.