meetup schedules

from functools import cmp_to_key

def cmp(first,second):
	first_arr, first_dep = first
	second_arr, second_dep = second
	if first_dep==second_dep:
		if first_arr==second_arr:
			return 0
		elif first_arr>second_arr:
			return 1
		else:
			return -1
	elif second_dep>first_arr:
		return -1
	else:
		return 1

def meetup(arrival, departure):
	times = []
	for i,j in zip(arrival, departure):
		times.append((i,j))
	print(times)
	times = sorted(times, key=cmp_to_key(cmp))
	print(times)
	visited = [0 for i in range(len(arrival))]
	pos = 0
	for i in range(times[0][0],times[-1][1]+1):
		print(pos, times[pos])
		if times[pos][0]<=i<=times[pos][1]:
			visited[pos]=1
			pos+=1
	return sum(visited)

arrival = [1,2,3,3,3]
departure = [2,2,3,4,4]

print(meetup(arrival, departure))