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Quick Summary

Design a system to efficiently search for exact phrases across a massive collection of documents.
Requires preprocessing text into an index structure to support fast case-insensitive lookups.
Must handle large-scale constraints with millions of documents and frequent queries.

What This Tests

Hash table design and optimization for large datasets.
String normalization and tokenization techniques.
Positional matching algorithms for phrase retrieval.
System design trade-offs between memory usage and query speed.

Common Patterns

Hashing

Test Cases

Input

Output

Expected