실버5 : 해쉬 문제이다. 풀이 간단한 해쉬 문제! Code import sys n = int(input()) company_dict = dict() for _ in range(n): name, action = input().split() if name not in company_dict: company_dict[name] = False if action == "enter": company_dict[name] = True elif action == "leave": company_dict[name] = False ans = [] for name, state in company_dict.items(): if state: ans.append(name) ans = sorted(ans, reverse=True) for name in ans: print(name) Reference 백준(7785번) - 회사에 있는 사람