Given a Trip table, find each driver's consecutive 8-hour period with the highest total trip earnings. A window starts at any trip's start_tim…

Implement should_accept_transaction(transaction, rules) for a fraud-rule engine. Part 1 — String equality rules Each transaction has string fields, such…

Design a thread-safe resource manager that prioritizes, loads, cancels, caches, and notifies multiple component requests efficiently under high concurre…

Given an integer array v , where v[i] represents the episode watched on day i , and two integers k and t , determine whether there exist two different d…

Given an integer array, find the maximum sum of a contiguous subarray. Update the solution when the array is circular, meaning the last element connects…

Assume these are correctly implemented and available: llm(prompt, system) -> str # calls an LLM, returns text parse_action(text) -> (name, input)…

Design an extensible logger that supports multiple independent log handlers, such as console, truncation, and in-memory storage, while allowing new hand…

Part 1: Given a CSV transaction string, return a CSV string containing id , transaction_type , payment_provider , and fee . Calculate payment, refund, a…

Modern organizations receive a high volume of emails daily, ranging from customer inquiries and support requests to internal communications and notifica…

You’re in a ski tournament, where you ski from the top of the mountain to one of the finish checkpoints at the bottom. There are multiple routes with ch…

Given a dictionary of English words, preprocess it in a setup phase so future lookups can be very efficient. Given 9 letters, where each occurrence can…

Part 1: Basic Ad Server Design an AdServer class with two APIs: InsertAd(content, score) : Insert a new advertisement with a score. GetAd() : Return the…

How to understand, debug, and optimize large-scale data pipelines using Spark and Kafka. They covered investigating slow Spark jobs, identifying data sk…

Given a very large array of n integers, find the k largest elements, including duplicates, in descending order. First, solve it using a min heap and Qui…

CSAT Tracker with Rolling Average, Updates, and Percentiles Implement record(conversation_id, score, timestamp) to store CSAT scores from 1 to 5. Implem…

Write a function that removes duplicate user events occurring within a given time window for the same user and event type, then returns per-user counts,…

Implement a RateLimiter that allows at most maxRequests per user within a sliding window of windowSizeInSeconds . allowRequest(userId, timestamp) return…

Given chronologically sorted requests, each with a timestamp, user ID, and experience, implement a sliding-window rate limiter. A request is allowed onl…

Given a text string and a glossary, insert spaces to generate all possible sentences where every segment matches a glossary entry. In Part 2, both the i…

Trending Tracker: Top-K Retrieval You are building a trending tracker. You receive a stream of operations: apply(“inc”, key, delta) — increase the key’s…