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Quick Summary
Design an in-memory note-taking system supporting CRUD operations.
Enforce unique sequential identifiers and case-insensitive title constraints.
Track metadata timestamps and format note retrieval as pipe-delimited strings.
What This Tests
Hash-based data structures for O(1) lookups and conflict detection
Object-oriented design and state management
String manipulation and precise output formatting
Robust input validation and edge case handling
Common Patterns
Hashing
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Hint 2
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