Harden unordered_map cache index
Hard C++ arena: hash maps, reserve, custom keys, and collision-aware reasoning
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Missing prerequisites: cpp-easy-unordered-map-cache
A request deduper needs fast lookups by composite request identity. You are working inside a C++ performance arena, and the arena only clears when the result is safe, deterministic, and explainable.
Learn to apply hash maps, reserve, custom keys, and collision-aware reasoning in a C++ performance arena while explaining the invariant, safety constraints, and hidden edge cases.
- Demonstrates hash maps, reserve, custom keys, and collision-aware reasoning
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids unsafe dynamic execution
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