Given a n (large number) lists of customers who visited n webpages on n (large number) days, design a data structure to get customers who have visited the website on exactly "k" days and should have visited at least "m" distinct pages altogether.
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Given a n (large number) lists of customers who visited n webpages on n (large number) days, design a data structure to get customers who have visited the website on exactly "k" days and should have visited at least "m" distinct pages altogether.