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Quick Summary
Count the frequency of each advertisement ID from the provided log entries.
Rank the ads primarily by frequency in descending order, using lexicographical order as a tiebreaker.
Return the top k ranked advertisement identifiers.
What This Tests
Hash map frequency counting
Min-heap priority management
Custom comparator implementation
Top-K selection efficiency
String ordering logic
Common Patterns
Heap / Priority Queue
Hashing
Sorting
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