Process a Mutable Stock-Price Log
Company: Lead Bank
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: medium
Interview Round: Onsite
Overview: Process a mutable stock-price log with lookups, updates, percentage-change queries, and pairwise ticker comparisons. The problem tests correct state changes, update provenance, missing records, exact percentage formatting, large operation streams, and clear treatment of dates as opaque identifiers.
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