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Quick Summary
Compute a weighted similarity score between a target user and every other profile based on exact field matches.
Return the IDs of all profiles whose similarity score meets or exceeds a specified threshold.
Exclude the target profile itself and handle cases where the target does not exist.
What This Tests
Efficient data parsing and header-to-index mapping
Hash-based lookups for field weights and ID tracking
Accumulating weighted scores during single-pass iteration
Handling edge cases like missing targets and self-comparison
Common Patterns
Hashing
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