第4、5测试点超时,大佬们有空看一下~
n = int(input()) having_list = [] for i in range(n): #将每一对情侣放入元组中,再将元祖放入列表 list1 = input().split(" ") having_list.append((list1[0],list1[1])) m = int(input()) ipt_list = input().split(" ") for i in having_list: #如果一对情侣都在,那么就从出席人列表中移除 if i[0] in ipt_list and i[1] in ipt_list: ipt_list.remove(i[0]) ipt_list.remove(i[1]) out_list = sorted(ipt_list) print(len(out_list)) if out_list: #如果列表为空,则不打印 print(" ".join(sorted(out_list)))