CounterRank:
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The ranking of counters is kept in memory.
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Every time a counter is incremented, the ranking has to be updated too.
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Different counters may have the same value, hence, they will share the same ranking.
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The leaders are the counters at first place.
The exercise consists to implement the CounterRank.API behaviour in the best
possible way, keeping in mind the expected worst case complexity. You will find
more details in CounterRank.API module.