User Engagement Patterns

Input: viewing_data = [ {"account_id": "U1", "title_id": "T1", "title_runtime_secs": 3600, "watched_secs": 3500, "day_nbr": 1}, {"account_id": "U1", "title_id": "T2", "title_runtime_secs": 5400, "watched_secs": 5000, "day_nbr": 3}, {"account_id": "U2", "title_id": "T1", "title_runtime_secs": 3600, "watched_secs": 800, "day_nbr": 5}, {"account_id": "U2", "title_id": "T2", "title_runtime_secs": 2700, "watched_secs": 500, "day_nbr": 9}, {"account_id": "U3", "title_id": "T1", "title_runtime_secs": 3600, "watched_secs": 1800, "day_nbr": 2} ]

Output: {"Completed": 1, "Abandoned": 1, "Sampled": 1}