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Bloomberg's loop is a coding-heavy gauntlet: three back-to-back technical rounds each pack two LeetCode-style problems with little hand-holding, plus an HR screen and an engineering manager round that anchors on a single deep project story. The coding bar emphasizes pristine communication — dry-running, edge cases, and complexity discussion are graded as heavily as the solution itself, and interviewers routinely push for second-best alternatives even after a working answer. New-grad and tech-screen verdicts often arrive within hours, while jump-shift onsites favor candidates who can explain past trade-offs without prompting.

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Coding·60 min
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Flatten a Multilevel Doubly Linked List

Flatten a doubly linked list whose nodes carry an extra child pointer into a single-level doubly linked list, in-place. A long-running Bloomberg classic that appears in phone screens and onsite rounds alike.

SWE
linked-list
dfs
recursion
medium
3 related discussions

OJ Problems

practice in the online judge
79 total
Alien Dictionary / Recover Character Order from Sorted WordsDetect Duplicate Items Within a 60-Second Sliding WindowMinimum Cost to Send People to Two Cities (Generalized to K)Design an OOP LRU CacheShortest Path on a Grid with Gas Stations (State Reset)Add Two Numbers (Forward Order Linked Lists)Van Eck-like Sequence: N-th TermFlatten a Multilevel Linked List (Pointer Reconnection)Check Connectivity Between Two Subway StationsTwo-City Onsite Flight Cost MinimizationEnumerate Round-Robin Match Schedules (Generate All Possible Pairings by Round)Remove Invalid Parentheses (Minimum Removal, Return All Valid Strings)Bucket Values Into Boundary RangesFind the Root Cause Node from Parent-to-Children LogsDesign a data structure supporting insert, delete, and query Top-K frequent elementsCandy Crush in 1D (Stabilize by Repeatedly Removing Groups)Insert Delete GetRandom O(1)Design an Ordered StreamFlatten a Multilevel Doubly Linked ListTrain a Next-Word Predictor from Tokenized SentencesDecode an Encoded String with Nested PatternsDesign a Lottery System with O(1) DeleteFlatten a Linked List with Down PointersLength of the Longest Substring Without Repeating CharactersBinary Tree Vertical Order TraversalWord Search in a 2D boardImplement atoi (string to integer conversion)Grid Path Reachability with Refueling (Fuel-Constrained BFS)Validate Stack SequencesGas Station Feasibility / Complete Circuit

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