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"""

Round Robin is a scheduling algorithm.

In Round Robin each process is assigned a fixed time slot in a cyclic way.

https://en.wikipedia.org/wiki/Round-robin_scheduling

"""

from statistics import mean

from typing import List

def calculate_waiting_times(burst_times: List[int]) -> List[int]:

"""

Calculate the waiting times of a list of processes that have a specified duration.

Return: The waiting time for each process.

>>> calculate_waiting_times([10, 5, 8])

[13, 10, 13]

>>> calculate_waiting_times([4, 6, 3, 1])

[5, 8, 9, 6]

>>> calculate_waiting_times([12, 2, 10])

[12, 2, 12]

"""

quantum = 2

rem_burst_times = list(burst_times)

waiting_times = [0] * len(burst_times)

t = 0

while True:

done = True

for i, burst_time in enumerate(burst_times):

if rem_burst_times[i] > 0:

done = False

if rem_burst_times[i] > quantum:

t += quantum

rem_burst_times[i] -= quantum

else:

t += rem_burst_times[i]

waiting_times[i] = t - burst_time

rem_burst_times[i] = 0

if done is True:

return waiting_times

def calculate_turn_around_times(

burst_times: List[int], waiting_times: List[int]

) -> List[int]:

"""

>>> calculate_turn_around_times([1, 2, 3, 4], [0, 1, 3])

[1, 3, 6]

>>> calculate_turn_around_times([10, 3, 7], [10, 6, 11])

[20, 9, 18]

"""

return [burst + waiting for burst, waiting in zip(burst_times, waiting_times)]

if __name__ == "__main__":

burst_times = [3, 5, 7]

waiting_times = calculate_waiting_times(burst_times)

turn_around_times = calculate_turn_around_times(burst_times, waiting_times)

print("Process ID \tBurst Time \tWaiting Time \tTurnaround Time")

for i, burst_time in enumerate(burst_times):

print(

f" {i + 1}\t\t {burst_time}\t\t {waiting_times[i]}\t\t "

f"{turn_around_times[i]}"

)

print(f"\nAverage waiting time = {mean(waiting_times):.5f}")

print(f"Average turn around time = {mean(turn_around_times):.5f}")

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