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ClearTax operates scheduled employee shuttle services between office locations. Given the arrival and departure times of buses at one station, compute the minimum number of platforms required so that no bus waits for an available platform.
You are given two arrays, arrivals and departures, where arrivals[i] and departures[i] represent the arrival and departure time of the same bus. Times are integers in HHMM format, such as 930 for 9:30 AM and 1545 for 3:45 PM. A platform remains occupied when a bus arrives at exactly the same time another bus departs.
Return the minimum number of platforms needed at any point during the schedule.
Implement min_platforms(arrivals, departures).
def min_platforms(arrivals, departures):