Active Sprint Filter

A project tracking system logs team activity throughout the workday. Each log entry has the format "teamId action timestamp", where action is either check_in or check_out and timestamp is a non-negative integer. Log entries are sorted in chronological order.

A sprint session is defined as a check_in event followed by the next check_out event for the same team. The duration of that sprint is check_out_time - check_in_time. ...