링크 - https://programmers.co.kr/learn/courses/30/lessons/42888
def solution(record):
answer = []
id_name = {}
for i in record:
s = i.split(" ")
if s[0] == "Enter":
id_name[s[1]] = s[2]
if s[0] == "Change":
id_name[s[1]] = s[2]
for i in record:
s = i.split(" ")
if s[0] == "Enter":
answer.append(f"{id_name[s[1]]}님이 들어왔습니다.")
if s[0] == "Leave":
answer.append(f"{id_name[s[1]]}님이 나갔습니다.")
return answer