1. Description

In addition to visit frequency, we also want to know how long users have been using our app.

Implement a page dwell time analyzer. Input multiple user visit records (format: userID enter_time exit_time, e.g., u123 09:30 09:35). Calculate each user's total dwell time in minutes and output the top 3 users with the longest duration. Tie-breaking rules:

1. Sort by latest exit time
2. If exit times are identical, sort by userID alphabetically

2. Input & Output

Input:

• Multiple lines of userID enter_time exit_time (time in HH:MM format, exit always after enter)
• End input with EOF

Output:

• Top 3 users in format userID total_minutes last_exit_time
• Each user in a separate line

Example

# Input:  
u1 09:00 09:05  
u2 10:00 10:15  
u1 11:30 11:45  
u3 14:00 14:30  
u2 15:00 15:10  

# Output:  
u1 20 11:45  
u2 25 15:10  
u3 30 14:30  

# Input:  
bot5 00:00 00:30  
human 13:05 13:20  
bot5 01:00 01:25  
human 14:00 14:15  

# Output:  
bot5 55 01:25  
human 30 14:15