문제 https://programmers.co.kr/learn/courses/30/lessons/43164?language=python3 코딩테스트 연습 - 여행경로 [["ICN", "SFO"], ["ICN", "ATL"], ["SFO", "ATL"], ["ATL", "ICN"], ["ATL","SFO"]] ["ICN", "ATL", "ICN", "SFO", "ATL", "SFO"] programmers.co.kr 코드 from collections import defaultdict def solution(tickets): answer = [] routes=defaultdict(list) for ticket in tickets: routes[ticket[0]].append(ticket[1]) for ke..