Problem – Merge Overlapping CI Intervals Atlassian runs many CI pipelines, and we want to generate reports on usage to find cost-optimization patterns. Each CI pipeline starts at time X and ends at time Y. We are given a list of pipeline time windows: [[X₁, Y₁], [X₂, Y₂], …] Objective Find the list of non-overlapping…

Problem – Find Overlapping Pipeline Intervals Find all time intervals during which at least two pipelines are running at the same time. You are given a list of half-open or closed intervals (assume closed here) where each interval[start, end] represents the running time of one pipeline. Return all sub-intervals where the number of running pipelines…

The VOprep team has long accompanied candidates through various major company OAs and VOs, including Meta, Amazon, Citadel, SIG, providing real-time voice assistance, remote practice, and interview pacing reminders to help you stay smooth during critical moments. If you are preparing for these companies, you can check out our customized support plans—from coding interviews to system design,…

Triplet Card Game — AI Strategy Task You can see there is a 4×4 grid of cards, Ace through Nine.Each turn consists of picking up 3 cards which add up to 15 (Aces count as 1);these cards are then replaced from the deck. If you can’t pick up exactly 3 cards that add up to…

Say we have a tournament of some sort. It doesn’t matter what the tournament is for. All we need to know is: Given the results of a tournament and the IDs of two players,we’d like to know which of those two players did better in the overall tournament. Game results are in the format: Example…

Build a tool that, when given our domains and a list of other domains, alerts the user to all the possible typo-squats of our domains present in the list of other domains. Potential kinds of typos: Part 1 Detect typos where a single character from one of our domains has been changed into a different…

Given a list of historic stock prices,write a function that tells when you should have bought and sold to make the most profit. You can only buy and sell once. Example input: Goal:Return the best buy date and best sell date to maximize profit. One pass: track the lowest price so far, and at each…

Imagine you have a Twitter-style social network.Each post can have multiple tags. Your task: Return the top X most frequent tags used by your friends and your friends-of-friends. In other words, starting from a given user: Example (conceptual): If X = 2, output: Use BFS up to depth 2 to collect friends and friends-of-friends.Count tag…

I own a parking garage that provides valet parking service. There are three types of parking spots: Cars also come in three sizes: Rules: You receive a stream of parking events.Each event is either: Your system must assign a valid spot on arrival and free the spot on departure. Example input (conceptual): You need to…

You are given an integer array coins representing coin denominations, and an integer amount representing a total amount of money. Return the fewest number of coins needed to make up the given amount.If it is not possible, return -1. You may use unlimited coins of each denomination. Example 1 Example 2 Use DP:dp[x] = min(dp[x],…

You are given an array of integers representing the amount of money stored in each house.The houses are arranged in a line, and you cannot rob two adjacent houses. Return the maximum amount of money you can rob without ever robbing two adjacent houses. Example (Explanation: choose non-adjacent houses so the sum is maximized.) Use…

Amazon has web server logs from multiple hosts.Each log entry consists of: Example (conceptual): We want to find the 3-page pattern that is visited most frequently across all sessions. In the example, the sequence <cart, checkout, help> appears twice, so it is the most frequent 3-page pattern. Given logs in the form: Return the 3-page…

Convert a number to an Excel column, and convert an Excel column back to a number. In Excel, columns are labeled as: You are asked to implement two functions: You may assume: The VOprep team has long accompanied candidates through various major company OAs and VOs, including Google, Amazon, Citadel, SIG, providing real-time voice assistance, remote practice,…

Implement the Linux find command as an API. Your API should support searching for files that match: Assume the filesystem is represented as a tree-like structure of directories and files. Your job:Design and implement a find-like API that searches the file system and returns all files that satisfy the given filters. Do a DFS traversal…

You are given a (potentially large) list of words.Some words are compound words, meaning they are composed of two or more words that also exist in the same list. Example word list:[rockstar, rock, star, rocks, tar, stars, rockstars, super, highway, high, way, superhighway] Goal:Identify all combinations where a word can be decomposed into two or…

Given an array of integers, find the index of a local minimum. A local minimum is defined as an element that is strictly smaller than its neighbors.Formally: You may assume: Goal:Return the index of one such local minimum. Example: You must return the index of any element that is strictly smaller than both neighbors.Since adjacent…

Implement the function pow(x, n), which calculates x^n.Note that you cannot use any built-in functions that directly implement pow. Examples: Key Ideas: This approach tests understanding of recursion, divide and conquer, and edge case handling (e.g. negative powers, floating-point base). The VOprep team has long accompanied candidates through various major company OAs and VOs, including SnowFlake, Google,…

Your team is debugging a program’s performance. A tracing tool records all function calls and returns, producing a sequence of events.Your task is to analyze these raw traces and determine which call stack occurs most frequently.Finding the most frequent call stack will help identify where the main slowdown may be occurring. Input Output Call Stack…

Roblox has a marketplace with millions of items. A user can flag/unflag any item as a favorite (similar to Like/Bookmark).Goal: Design a system that can show the number of favorites each item has. User Stories / QPS targets Extra:– As a user, I want to list all items I have favorited — 50K QPS (Insert…

This question focuses on system design and scalability within the context of Roblox’s Game Detail Page.You’re asked to design how to efficiently display: while considering massive user scale (100M total, 10M concurrent). Key challenges include: Typical design solutions might involve: The VOprep team has long accompanied candidates through various major company OAs and VOs, including Roblox, Google,…