notamused

Not Amused

ID: notamused

Difficulty: 2.4

CPU Time: 1 second

Memory: 1024 MB

Solution

For this, split the input into 3 cases: reset all the tallies of costs and whatnot for "OPEN", store a check in/out for "ENTER"/"EXIT", and evaluate all costs and output all data for "CLOSE". For recording a check in/out, simply note the name if it hasn't been seen, and mark the time on a list of times for this person (a map is helpful, and tracking data this way is acceptable because the problem specifies that there are no mis-reads). For a close, sort the names recorded, and process them in that order. A cost starts at 0, and one can go through the times recorded for this person, and take every pair of numbers, and add the difference to the cost. After this is done, output the cost * $0.10.