# loginIdsに入っているIDのリストのうち、
# paidIdsに含まれ、かつ、blockIdsに含まれていないIDのリストを返すメソッド「premiumUserIds」を完成させよ
# 引数の例 : 
# loginIds = [1, 2, 3, 4, 5, …, 1000]
# paidIds = [10,45,89 …, 13001, 13112]
# blockIds = [3, 1843, …, 2221]
def premiumUserIds(loginIds, paidIds, blockIds):

def premiumUserIds(loginIds, paidIds, blockIds):
premiumUserIds = []
for pairId in pairIds:
if pairId in loginIds:
premiumUserIds.append(pairId)
for blockId in blockIds:
if blockId in premiumUserIds:
premiumUserIds.delete(blockId)
return premiumUserIds

def premiumUserIds(loginIds, paidIds, blockIds):
premiumUserIds = set(pairIds) - set(blockIds)
return premiumUserIds と loginIds の積集合をとる