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Quick Summary
Match socks that share the same color but are designed for opposite feet.
Each sock can only belong to one pair, and all IDs are unique.
Return a list of paired sock IDs without duplicates or leftovers.
What This Tests
Hash table grouping and lookup efficiency
Parallel array traversal and data synchronization
Greedy selection for optimal pairing
Handling large input sizes within time constraints
Common Patterns
Hashing
Sorting
Greedy
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