6 min read Core Entities Subscriber: subscriber_id, user_id, plan_id, status (ACTIVE, PAUSED, CANCELLED), billing_cycle_anchor, next_billing_date, shipping_address, preferences[], skip_count. Plan: plan_id, name, price_cents, billing_interval […] Read article
6 min read Core Entities Provider: provider_id, name, specialty, clinic_id, npi_number, languages[], accepts_new_patients. ProviderSchedule: schedule_id, provider_id, day_of_week, start_time, end_time, slot_duration_minutes, is_active. Appointment: appointment_id, Read article
6 min read What Is Amortized Analysis? Amortized analysis gives the average cost per operation over a sequence of operations, even when individual Read article
6 min read RESTful Resource Modeling Resources are nouns, not verbs. POST /orders (create), GET /orders/{id} (read), PUT /orders/{id} (replace), PATCH /orders/{id} (partial Read article
6 min read Why Randomized Algorithms? Randomized algorithms use random choices to achieve good expected performance, simplify implementation, or avoid worst-case inputs that Read article
7 min read When to Use DP on Graphs DP on graphs works when the graph has structure that prevents cycles in the Read article
6 min read Core Entities Patient: (patient_id, name, dob, allergies[], insurance_id, primary_care_provider_id). Prescription: (rx_id, patient_id, prescriber_id, drug_ndc, drug_name, dosage, quantity, days_supply, refills_remaining, written_date, Read article
7 min read Naive String Matching For each position i in text (0 to n-m): check if text[i:i+m] == pattern. O(n*m) in the Read article
6 min read Architecture Overview A multiplayer game backend handles: matchmaking (finding players with similar skill), game sessions (real-time state sync during a Read article
7 min read Core Entities Document: (doc_id, title, owner_id, workspace_id, current_version_id, status=ACTIVE|ARCHIVED|DELETED, created_at, updated_at). DocumentVersion: (version_id, doc_id, version_number, content_url, content_hash, size_bytes, created_by, created_at, Read article
7 min read Bellman-Ford Algorithm Finds shortest paths from a source to all nodes, handling negative edge weights. Algorithm: initialize dist[source]=0, dist[all others]=inf. Read article
6 min read What Is an Online Judge? An online judge (LeetCode, HackerRank, Codeforces) accepts code submissions in multiple languages, executes them against Read article
6 min read Core Entities Policy: (policy_id, policyholder_id, policy_type=AUTO|HOME|HEALTH|LIFE, coverage_amount_cents, premium_cents, deductible_cents, start_date, end_date, status=ACTIVE|EXPIRED|CANCELLED). Claim: (claim_id, policy_id, claimant_id, incident_date, reported_date, claim_type, description, Read article
6 min read The Feed Problem A social network feed shows a user the recent posts from people they follow, ranked by relevance Read article
6 min read Core Entities Coupon: (coupon_id, code, discount_type=PERCENTAGE|FIXED_AMOUNT|FREE_SHIPPING|BUY_X_GET_Y, discount_value, min_order_amount_cents, max_discount_cents, start_date, end_date, is_active, usage_limit_global, usage_limit_per_user, applicable_to=ALL|CATEGORY|PRODUCT, applicable_ids[]). CouponUsage: (usage_id, coupon_id, user_id, Read article
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