#### Fcfs

P
```"""
fcfs(n, process_id, burst_time)

Implementation of first come first served scheduling algorithm

# Output
Tuple of vectors (process_id, burst_time, waiting_time, turnaround_time, avg_waiting_time, avg_turnaround_time)

# Example

```julia
n = 3 # number of processes
process_id = Any[1, 2, 3] # process ids
burst_times = Any[3, 4, 5] # burst times
fcfs(n, process_id, burst_times)
```
# Reference

https://en.wikipedia.org/wiki/Scheduling_(computing)#First_come,_first_served

Contributed By:- [Ashwani Rathee](https://github.com/ashwani-rathee)
"""
function fcfs(n, process_id, burst_time)
waiting_time = []
push!(waiting_time, 0)
for i in 2:n
# Calculates waiting time
push!(waiting_time, burst_time[i-1] + waiting_time[i-1])
end

turnaround_time = []
for i in 1:n
# Calculates turnaround time
push!(turnaround_time, burst_time[i] + waiting_time[i])
end

# Calculates Average waiting time
avg_waiting_time = sum(waiting_time) / length(waiting_time)

# Calculates Average turnaround time
avg_turnaround_time = sum(turnaround_time) / length(turnaround_time)

return process_id,
burst_time,
waiting_time,
turnaround_time,
avg_waiting_time,
avg_turnaround_time
end
```