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Quick Summary
Parse formatted price history strings into an efficient lookup structure during initialization.
Support constant-time price retrieval by exact date.
Compute and format percentage changes between two dates while rigorously handling missing dates and zero-price edge cases.
What This Tests
String parsing and data extraction
Hash map implementation for O(1) lookups
Floating-point arithmetic and precise output formatting
Class state management and defensive programming
Common Patterns
Hashing
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