Bloomberg Coding & Algorithms Interview Questions
Bloomberg Coding & Algorithms interview questions focus on algorithmic problem solving under realistic engineering constraints. What’s distinctive is a strong emphasis on clear, communicative coding and complexity reasoning rather than perfect syntax: interviewers often probe trade-offs, edge cases, and performance for low-latency, data-intensive systems and may include a code-review-style exercise. Evaluations typically target data structures and algorithms fluency, problem decomposition, optimization, correctness, and the ability to reason aloud while iterating on solutions. Expect a recruiter screen followed by one or more technical coding rounds (45–60 minutes) and, for many roles, a separate system-design or code-review conversation and behavioral interview. For interview preparation, prioritize medium-to-hard algorithm practice across arrays, strings, trees, graphs, hash tables, and dynamic programming, and simulate timed, language-agnostic coding sessions without IDE aids. Practice explaining complexity, writing clean, testable code, and walking through bug fixes. Also prepare concise examples of impact and a clear “Why Bloomberg?” so you can demonstrate both technical depth and fit.
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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...
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 ...
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...
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...
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...
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...
Implement a simplified grep with extensible flags
Problem Implement a simplified version of grep that searches a text file and returns the lines that match a given query string. You should focus on cl...
Solve word path in grid and trapped water
You are given two independent programming tasks. --- Problem 1: Check if a word exists in a 2D character grid You are given a 2D grid board of charact...
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...
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...
Answer multi-round grid and data-structure questions
You are given several independent interview-style coding questions. 1) Find first/last occurrence in sorted array (+ dynamic updates follow-ups) Given...
Design variable-size LRU cache
Implement an in-memory cache with least-recently-used eviction where each entry has a variable size in bytes. The cache exposes set(key, value, size),...
Solve two array and string problems
You will solve two independent coding tasks. Problem 1: Generate All Subsets of a Set You are given an integer array nums containing n distinct elemen...
Solve string dictionary and tree ordering
Part A — One-edit dictionary: Build a data structure supporting build(words: List[str]) and search(query: str) -> bool that returns true if and only i...
Group words into anagram lists
Given an array of strings, group the words into lists of anagrams and return the collection of groups in any order. For example, ["abc", "cab", "edf"]...
Implement island counting with BFS and DFS
Given an m x n grid of characters where '1' represents land and '0' represents water, count how many connected land regions exist. Two cells are conne...
Solve Number of Islands
Question LeetCode 200. Number of Islands – Given a 2D grid of '1's (land) and '0's (water), count the number of islands. Follow-up: implement the solu...
Implement anagram check and odd-even linked list
You are given two independent coding tasks. Task 1: Check if two strings are anagrams Implement a function that determines whether two given strings a...
Implement classes within an abstract Python framework
You are given an existing Python codebase (~200 lines shown) that defines an abstract base class DataProcessor with abstract methods load(self), trans...
Count subarrays with product under target
Given an array of positive integers nums and an integer T > 1, return the number of contiguous subarrays whose product is strictly less than T. Provid...