from collections import deque
graph = {}
graph["you"] = ["faik"]
graph["faik"] = ["ali", "özge", "serkan"]
graph["ali"] = ["kamil", "derya"]
graph["özge"] = ["derya"]
graph["serkan"] = ["mehmet"]
graph["kamil"] = []
graph["derya"] = []
graph["mehmet"] = []
class Graph:
def __init__(self)...