Bloomberg Interview Questions
Practice the exact questions companies are asking right now.
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Check connectivity between two subway stations
You are given a description of subway stations A, B, C, D, E, ... as a graph. For each station, you are told which other stations it directly connects...
Design a data structure for dynamic top‑K frequency
Design a data structure that maintains a multiset of integers and supports the following operations efficiently: Operations - insert(x): Add one occur...
Minimize travel cost with two cities
You are scheduling candidates to attend an onsite interview. Each candidate i can fly to New York for cost c1[i] or to San Francisco for cost c2[i]. C...
Design streaming mention analytics with search and alerts
Scenario You ingest a real-time external stream of social-media posts and news articles. Each item contains raw text and metadata (timestamp, source, ...
Implement sliding-window timestamped average
Problem Implement a class that maintains a time-based sliding window of records and can return the average score within the current window. Requiremen...
Count islands by requested sizes
You are given a 2D grid of characters '0' and '1', where '1' represents land and '0' represents water. An island is a maximal group of horizontally/ve...
Find tree root and bucket numbers
You are given two independent tasks. Task 1: Find the root of a tree from adjacency logs You are given an unordered list of records describing a roote...
Design a fair event registration queue API
Scenario Design an in-memory service (OOD-style) to manage registrations for an event where fairness means users are served strictly in the order they...
Solve three coding tasks from onsite
You are given three separate coding tasks (solve each independently). Provide an algorithm and implement it. 1) Circular route with gas and cost You a...
Predict most likely next word from training data
You are given tokenized training data consisting of multiple sentences (each sentence is a list of words). Build a lightweight model/data structure th...
Validate whether brackets are properly nested
Problem: Validate a bracket sequence Given a string s consisting only of the characters '(', ')', '{', '}', '[', ']', determine whether the string is ...
Solve common string/tree/grid interview tasks
Problem Set (solve all in one interview) 1) Parse an integer from a string ("atoi"-style) Implement a function: - parseInt(s: string) -> int Given a s...
Count friend requests based on age rules
Problem You are given an array ages, where ages[i] is the age of the i-th person. A person of age A will send a friend request to a person of age B if...
Generate all strings by expanding wildcards
Problem Given a string s consisting only of characters '0', '1', and '', replace every '' with either '0' or '1' and return all possible resulting bin...
Solve sliding-window, flattening, decode, and O(1) random set
You are given four independent coding tasks. For each, describe your approach, time complexity, and handle edge cases. 1) Longest substring without re...
Compute meeting rooms and evaluate RPN
You are given two independent coding tasks. Task 1: Minimum number of meeting rooms Given a list of meeting time intervals intervals, where each inter...
Introduce yourself and explain why Bloomberg
Behavioral questions 1. Self-introduction / resume walkthrough - Give a 1–2 minute overview of your background. - Highlight 1–2 projects you’ve ...
Design in-memory trade subscription processor
You are asked to design and implement the internal logic of an in-memory trade subscription processor in C++. A simplified interface is provided: `cpp...
Design an in-memory TODO list API
Object-Oriented Design: TODO List Design an in-memory TODO list component that supports the following operations: - add(todo) → returns an id - delete...
Find invalid transactions in time-sorted input
Problem You are given a list of transaction records, already sorted in non-decreasing order by time. Each transaction is a string in the form: "name,t...