회의실배정 https://www.acmicpc.net/problem/1931 n = int(input()) meet_list = [] for _ in range(n): meet_list.append(list(map(int, input().split()))) meet_list.sort(key=lambda x: [x[1],x[0]]) result = 1 last_book_end_time = meet_list[0][1] for idx in range(1, len(meet_list)): if last_book_end_time