StealthCoder

Bloomberg OA questions,
200 reported by real candidates.

Every Bloomberg online assessment question candidates have reported, most recent October 2026. The pattern that shows up most: tree.

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October 2026 (1)

breadth first search
Sparse Vector and Matrix Operations

September 2026 (4)

tree
Lowest Common Ancestor in an N-ary Tree
Minimum Replacements to Make Two Strings Anagrams
Currency Conversion Rate
Running Stream Aggregates

August 2026 (2)

array
Merge Intervals
two pointers
Valid Palindrome II

July 2026 (1)

string
Word Break II

May 2026 (1)

heap priority queue
Mutable Stock Price Top K

March 2026 (3)

string
Decode String
linked list
Flatten a Multilevel Doubly Linked List
Two City Scheduling with an Odd Candidate Count

February 2026 (8)

array
Meeting Rooms II
One-Dimensional Candy Crush
Shortest Result After Candy Crush Removals
design
Design an Ordered Stream
Insert, Delete, and Get Random in Constant Time
dynamic programming
Longest Substring Without Repeating Characters
tree
Binary Tree Vertical Order Traversal
binary search
Word Search

January 2026 (1)

design
Design Underground System

December 2025 (2)

Valid Parentheses
Deepest Nested Substrings

November 2025 (10)

Trapping Rain Water
Generate Wildcard Binary Strings
Check Anagrams
Subsets
linked list
Flatten a Multilevel Singly Linked List
Find Median from Data Stream
design
LRU Cache Operations
Shortest Currency Conversion Chain
binary search
Validate Binary Search Tree
simulation
Find the Winner of the Circular Game

October 2025 (2)

binary search
Design Search Autocomplete System
array
Deep Copy a Random-Pointer List

February 2025 (2)

graph
Minimum-Cost Root-to-Leaf Path in an N-ary Tree
sorting
Welsh Custom Alphabet Sort

December 2024 (1)

hash table
Remove Letter to Equalize Frequency

November 2024 (1)

Count Index Pairs with a Target Sum

September 2024 (4)

sliding window
Consecutive
Count Numbers
dynamic programming
Find Longest Chain
Shuffle All the Decks

December 2023 (1)

design
Design Browser History

November 2023 (2)

breadth first search
Maximum Visibility in a Forest Grid
dynamic programming
Partition Labels

October 2023 (1)

IP Prefix Store

February 2023 (3)

Bank Operating-Hours Coverage
Count Teams Outscoring a Target Team
Number of Islands

December 2022 (2)

string
Index of the First Non-Repeating Character
string
Most-Frequent Next-Word Predictor

November 2022 (5)

Next Permutation
Knight Dialer Sequences
sorting
Emit an Out-of-Order Packet Stream in Order
binary search
Search in Rotated Sorted Array
Count Unhappy Friends

October 2022 (8)

Collatz Conjecture with Shared Memoization
Add Two Numbers
array
Merge Sorted Array
stack
Implement Stack Using Two Queues
Maximize Circular Rover Travel
string
Find the Index of the First Occurrence in a String
Kill Process
stack
Min Stack

September 2022 (5)

array
Merge Multiple Sorted Streams
Populate Next Right Pointers
tree
Find the Root Process
Move Zeroes with Sorted Nonzero Values
heap priority queue
Top K Frequent Words

July 2022 (5)

All Paths From Source to Target
Gossip Consensus on the Maximum Value
Maximum Product of Three Numbers
string
Word Break
two pointers
Unique Reverse-Recency Browser History

June 2022 (2)

Insert Delete GetRandom O(1) - Duplicates Allowed
Two Sum

May 2022 (2)

breadth first search
Enumerate Right-and-Down Matrix Paths
tree
Maximum Sum BST in a Binary Tree

April 2022 (2)

sorting
Sort by Variable-Length Alphabet Tokens
string
Word Ladder

January 2022 (7)

hash table
Character Intersection and Frequency Ordering
tree
Lexicographically Smallest Root-to-Leaf String
sorting
Sort Colors
Josephus Elimination Until Half Remain
Add Two Numbers II
string
Replace Characters in a Mutable String
array
Non-decreasing Array

December 2021 (1)

stack
Max Stack

November 2021 (2)

Minimum Refueling Stops
Passing Cars

September 2021 (1)

Valid Triangle Number

June 2021 (2)

sliding window
Consecutive Characters
tree
Flatten Binary Tree to Linked List

April 2021 (4)

Pow(x, n)
Lottery with Add and Pick Operations
Minimum Operations with Multiply by Two and Divide by Three
Number of Islands in Three Dimensions

March 2021 (1)

design
Design HashMap

February 2021 (11)

Alien Dictionary
tree
Binary Tree Level Order Traversal
breadth first search
The Maze
tree
Find Bottom Left Tree Value
Text Justification
string
Remove Adjacent Duplicates in String II
array
Count Target Occurrences in a Sorted Array
Fibonacci Number
dynamic programming
Coin Change
graph
Path Existence in an Undirected Graph
graph
Remove Nth Node From End

January 2021 (8)

Reconstruct Itinerary
design
LFU Cache
breadth first search
Minimum-Step Right-Down Grid Path
array
Rotate List
tree
Lowest Common Ancestor in a Binary Tree
Number of Distinct Islands
Target Sum Across Two Sorted Arrays
dynamic programming
Coin Change II

December 2020 (8)

tree
Decode a Binary Tree by Vertical Traversal
graph
All Simple Paths in a Cyclic Directed Graph
Maximum Non-Overlapping Longer Intervals
linked list
Validate Linked List Pointer Ordering
Count and Say
binary search
Search in a Bitonic Array
First Missing Positive
array
Merge Two Sorted Streams with Next Calls

November 2020 (7)

breadth first search
Maximum Grid Path Sum in Exactly N Moves
sorting
Sort an Absolute-Value-Sorted Array
graph
Sort Every N-ary Tree Node's Children
string
Word Break with One Reconstruction
binary search
Search a Valley Array
Find Peak Element
Shortest Bridge

October 2020 (3)

stack
Monotonic Array
Remove Invalid Parentheses
Intersection of Two Arrays

September 2020 (5)

Best Time to Buy and Sell Stock
graph
Delete Node in a BST
hash table
Group Anagrams
two pointers
Palindrome Number
Traverse an Up-Down-Right Pointer Structure

August 2020 (5)

breadth first search
Largest Same-Letter Grid Component
dynamic programming
Stable Odd-First Partition
Capacity-Bounded Browser History
Complex Number Class
Directional Distance to Mines and Boundaries

July 2020 (5)

binary search
Find K Closest Elements in a Sorted Array
tree
Integer Square Root with Error Checks
Clicked One-Dimensional Candy Crush
Print Unique Numbers
array
Sum of Mutated Array Closest to Target

June 2020 (2)

tree
Build a Tree from Preorder and Inorder Traversals
array
Maximum Concurrent Meeting Time Slots

May 2020 (5)

array
Minimum in a Rotated Sorted Array
First Unique Letter, Case Insensitive
Stock Price Range over a Sliding Day Window
Trending Stock
hash table
Sort Characters by Frequency

April 2020 (7)

two pointers
Minimum Insertions to Make a Palindrome
two pointers
Shortest Suffix to Form a Palindrome
two pointers
Valid Palindrome
tree
Binary Tree Inorder Traversal
Instant Runoff Election
Largest Rectangle in Histogram
hash table
Browser History by Frequency and Recency

March 2020 (8)

array
Constant-Time Restaurant Waiting List
Number of Dice Rolls With Target Sum
graph
Minimum Path Sum
Two Sum with Distinct Pairs
Allocate Mailboxes
string
Generate All String Permutations
Course Schedule
array
Last Position of a Target in a Sorted Array

February 2020 (2)

Three Calls Within Three Seconds
linked list
Sort an Absolute-Value-Sorted Linked List

January 2020 (1)

sliding window
Maximal Consecutive Number Ranges

November 2019 (8)

graph
All Simple Paths in an Undirected Graph
tree
N-ary Tree Right Side View
breadth first search
Four-Direction Unique Grid Paths
queue
Implement Queue Using Stacks
tree
Rebuild Binary Tree from Level Order
Configurable Valid Parentheses
tree
Binary Tree Spiral Level Order
graph
Find the Intersection Node of Two Linked Lists

October 2019 (8)

sorting
Order Employees by a Reports-To Hierarchy
tree
Linked List of Binary Tree Nodes at a Given Level
string
Interleaving String
Maximum Blocks in a Constrained Cave
Ordered Acknowledgement API
tree
Symmetric Tree
Transitive Greater-Than Relation Queries
array
Missing Element in Sorted Array

July 2019 (3)

Collapse Extra Spaces In Place
Generate Rand7 from Rand5
Random Removal from a Set

May 2018 (5)

hash table
Group Values into Equivalence Classes
design
Implement a Dynamic Array Vector
dynamic programming
Longest Palindromic Substring
greedy
Latest Top 100 News Stories
array
Furthest Episode Meeting a Completion Threshold
⏵ Beyond the OA

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Questions reported by candidates from real Online Assessments. Sourced from a publicly-available candidate-aggregated repository. Not affiliated with Bloomberg.

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