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Assumption: multiple users IDs with tracks they listened to in the last one week have been given to you.
- sriharshitav August 18, 2017Solution: Use a HashMap with UserId as the key and a Priority Queue (Max heap) of Songs based on the number of times that particular user has listened to. So the priority queue's top holds the song that was listened to the maximum number of times.
Alternatively, you could use a hashmap of treemaps reverse sorted based on the number of times a song has been listened to. Hope I am making sense.