6 min read The Sliding Window Pattern Sliding window optimizes O(n^2) brute-force approaches on contiguous subarrays/substrings to O(n). The key insight: instead of […] Read article
6 min read Core Entities Customer: customer_id, name, email, phone, default_address, stripe_customer_id. Restaurant: restaurant_id, name, address, location (lat/lng), cuisine_type, rating, is_open, prep_time_minutes, operating_hours. […] Read article
6 min read Core Entities Issue: issue_id, project_id, title, description (rich text), type (BUG, FEATURE, TASK, EPIC), status, priority (P0-P3), assignee_id, reporter_id, parent_issue_id […] Read article
7 min read State Machine DP Pattern State machine DP models problems as transitions between discrete states over a sequence. The key: define […] Read article
6 min read When Does Greedy Work? A greedy algorithm makes the locally optimal choice at each step and hopes it leads to […] Read article
5 min read What is a Vector Database? A vector database stores high-dimensional numerical vectors (embeddings) and supports efficient similarity search: “find the […] Read article
5 min read Core Entities Customer: customer_id, first_name, last_name, email, phone, date_of_birth, ssn_hash, kyc_status (PENDING, VERIFIED, REJECTED), address, created_at. Account: account_id, customer_id, account_number […] Read article
5 min read Core Entities Provider: provider_id, user_id, name, type (DOCTOR, CONSULTANT, TRAINER, THERAPIST), timezone, bio, photo_url, is_active. Service: service_id, provider_id, name, duration_minutes, […] Read article
5 min read Grid DP Fundamentals Grid DP problems define a 2D state space where dp[i][j] represents some optimum property at cell (i, […] Read article
6 min read Requirements An IoT data platform ingests telemetry from millions of connected devices — sensors, smart meters, industrial equipment, wearables — […] Read article