Bloomberg Interview Questions and Guide

Data structures and algorithms, with an emphasis on low-latency and data-heavy systems.

The Bloomberg interview loop

1. Phone screen (coding)
2. Onsite: 2 coding, system design, manager + HR

Bloomberg interview questions

• Design a Distributed Cache
• Design LeetCode
• Design a Real-Time Leaderboard
• Design a Stock Exchange
• Design a Real-Time Market Data Feed
• Longest Substring Without Repeating Characters
• Trapping Rain Water
• Container With Most Water
• Find the Duplicate Number
• Best Time to Buy and Sell Stock
• Valid Palindrome
• Valid Palindrome II
• Valid Word Abbreviation
• Merge Sorted Array
• Move Zeroes
• Longest Common Prefix
• Rotate Image
• Spiral Matrix
• Next Permutation
• Set Matrix Zeroes
• Longest Repeating Character Replacement
• Minimum Size Subarray Sum
• First Missing Positive
• Text Justification
• Remove Duplicates from Sorted Array
• Rotate Array
• Squares of a Sorted Array
• Two Sum II - Input Array Is Sorted
• Zigzag Conversion
• 4Sum
• 3Sum Closest
• Fruit Into Baskets
• Permutation in String
• String Compression
• Majority Element II
• Remove Element
• Merge Strings Alternately
• Maximum Average Subarray I
• Reverse Vowels of a String
• Maximum Product of Three Numbers
• Remove Duplicates from Sorted Array II
• Diagonal Traverse
• Increasing Triplet Subsequence
• Frequency of the Most Frequent Element
• Number of Substrings Containing All Three Characters
• Substring with Concatenation of All Words
• Rotate String
• Longest Substring with At Least K Repeating Characters
• Reverse Pairs
• Find Pivot Index
• Rearrange Array Elements by Sign
• Count Binary Substrings
• Can Make Arithmetic Progression From Sequence
• Find Missing and Repeated Values
• Find All Numbers Disappeared in an Array
• Valid Triangle Number
• Third Maximum Number
• Maximum Sum of Distinct Subarrays With Length K
• Maximum Number of Vowels in a Substring of Given Length
• Sort an Array
• Range Sum Query - Immutable
• Implement an LRU Cache
• Group Anagrams
• First Unique Character
• Valid Anagram
• Isomorphic Strings
• Valid Sudoku
• Continuous Subarray Sum
• Happy Number
• Contains Duplicate
• Ransom Note
• Word Pattern
• Count Number of Nice Subarrays
• Binary Subarrays With Sum
• Intersection of Two Arrays
• Repeated DNA Sequences
• Design Underground System
• Find All Duplicates in an Array
• Longest Palindrome
• Invalid Transactions
• Unique Number of Occurrences
• Brick Wall
• Jewels and Stones
• Find Common Characters
• Detect a Cycle (Floyd's Algorithm)
• Reorder List
• Add Two Numbers
• Swap Nodes in Pairs
• Rotate List
• Remove Duplicates from Sorted List II
• Sort List
• Reverse Nodes in k-Group
• Remove Duplicates from Sorted List
• Partition List
• Add Two Numbers II
• Next Greater Node In Linked List
• Daily Temperatures
• Valid Parentheses
• Min Stack
• Next Greater Element (Circular)
• Online Stock Span
• Minimum Remove to Make Valid Parentheses
• Decode String
• Asteroid Collision
• Simplify Path
• Basic Calculator
• Longest Valid Parentheses
• Sum of Subarray Minimums
• Next Greater Element I
• Remove All Adjacent Duplicates in String
• Remove All Adjacent Duplicates in String II
• Implement Queue using Stacks
• Maximal Rectangle
• Car Fleet
• Baseball Game
• Design Browser History
• Maximum Width Ramp
• Remove Outermost Parentheses
• Maximum Nesting Depth of the Parentheses
• Maximum Frequency Stack
• Design Hit Counter
• Design Circular Queue
• Implement Stack using Queues
• First Unique Number
• Find the Winner of the Circular Game
• Jump Game VII
• Number of Students Unable to Eat Lunch
• Time Needed to Buy Tickets
• Find the Safest Path in a Grid
• Top K Frequent Words
• Sort Characters by Frequency
• Furthest Building You Can Reach
• Meeting Rooms III
• Ugly Number II
• Design A Leaderboard
• Design Task Manager
• Find Minimum in Rotated Sorted Array
• Median of Two Sorted Arrays
• Search a 2D Matrix
• Sqrt(x)
• Single Element in a Sorted Array
• Kth Missing Positive Number
• Minimum Number of Days to Make m Bouquets
• Search a 2D Matrix II
• Peak Index in a Mountain Array
• Search in Rotated Sorted Array II
• Valid Perfect Square
• H-Index II
• Find a Peak Element II
• Heaters
• Arranging Coins
• Maximum Candies Allocated to K Children
• Binary Tree Right Side View
• Balanced Binary Tree
• Path Sum II
• Construct a Tree From Preorder and Inorder
• Same Tree
• Symmetric Tree
• Binary Tree Zigzag Level Order Traversal
• Binary Tree Vertical Order Traversal
• Sum Root to Leaf Numbers
• Maximum Width of Binary Tree
• Flatten Binary Tree to Linked List
• Minimum Depth of Binary Tree
• Path Sum
• Create Binary Tree From Descriptions
• Binary Tree Preorder Traversal
• Construct Binary Tree from Inorder and Postorder Traversal
• Validate a Binary Search Tree
• Trim a Binary Search Tree
• Inorder Successor in BST
• Unique Binary Search Trees
• Largest BST Subtree
• Count of Smaller Numbers After Self
• Number of Provinces (Connected Components)
• Flood Fill
• Surrounded Regions
• Alien Dictionary
• Find if Path Exists in Graph
• All Paths From Source to Target
• Most Stones Removed with Same Row or Column
• Critical Connections in a Network
• Number of Operations to Make Network Connected
• Island Perimeter
• Word Break
• Unique Paths
• Best Time to Buy and Sell Stock With Cooldown
• Maximum Product Subarray
• Palindromic Substrings
• House Robber II
• Unique Paths II
• Interleaving String
• Regular Expression Matching
• Maximum Profit in Job Scheduling
• Longest Increasing Path in a Matrix
• Pascal's Triangle
• Triangle
• Perfect Squares
• Maximum Sum Circular Subarray
• Wildcard Matching
• Best Time to Buy and Sell Stock III
• Best Time to Buy and Sell Stock with Transaction Fee
• Number of Longest Increasing Subsequence
• Delete and Earn
• Integer Break
• Partition Array for Maximum Sum
• Minimum Cost to Cut a Stick
• Fibonacci Number
• Domino and Tromino Tiling
• Generate Subsets and Permutations
• Word Search
• Subsets II
• Combination Sum II
• Permutations II
• Palindrome Partitioning
• Word Break II
• Expression Add Operators
• Subsets
• 24 Game
• Path with Maximum Gold
• Different Ways to Add Parentheses
• Gas Station
• Activity Selection (Max Meetings in One Room)
• Best Time to Buy and Sell Stock II
• Valid Parenthesis String
• Boats to Save People
• Lemonade Change
• Assign Cookies
• Two City Scheduling
• Maximum Element After Decreasing and Rearranging
• Merge Overlapping Intervals
• Minimum Meeting Rooms
• Meeting Rooms
• Summary Ranges
• Remove Covered Intervals
• Palindrome Pairs
• Lexicographical Numbers
• Number of 1 Bits (Brian Kernighan)
• Add Binary
• Single Number II
• Divide Two Integers
• Minimum Operations to Reduce an Integer to 0
• Number of Steps to Reduce a Number to Zero
• Pow(x, n) — Fast Exponentiation
• Palindrome Number
• Reverse Integer
• Roman to Integer
• Integer to Roman
• String to Integer (atoi)
• Multiply Strings
• Excel Sheet Column Title
• Angle Between Hands of a Clock
• Plus One
• Fizz Buzz
• Count and Say
• Sequential Digits
• Power of Three
• Ugly Number
• Add Digits
• Perfect Number
• Sum of Square Numbers
• Rotate Function
• Count Good Numbers
• Number of Digit One
• Excel Sheet Column Number
• Nth Digit
• Factorial Trailing Zeroes
• The kth Factor of n
• Rectangle Area
• Design an Elevator System
• Design a Stock Exchange Order Book
• Tell me about a time you had to meet a tight deadline
• Tell me about working with a difficult stakeholder
• How do you prioritize competing demands?
• Tell me about the hardest bug you've debugged
• Tell me about a time you pushed back on a request
• Tell me about a time you dove deep to find the root cause
• Tell me about a judgment call where others disagreed with you
• Teach me something you recently learned
• Why Bloomberg, and why financial technology?