说明：  5个顾客选3个商家交易的情形，一个顾客只能选择一个商家交易，一个商家可与多个顾客交易。采用迭代算法，迭代过程中有两个阶段，一个是顾客选商家，另一个是商家选顾客。双边同时选择对方，交易才成立。在一次迭代中，一个商家只能选择一个顾客。 % 顾客的资源需求分为四个等级，每个等级的需求量不同，其支付的价格也不同。
(In a situation where 5 customers choose to trade with 3 businesses, a customer can only choose one business and a business can trade with multiple customers. Using iterative algorithm, there are two stages in the iterative process, one is the customer chooses the business, the other is the business chooses the customer. Both sides choose the other side at the same time, the transaction is established. In an iteration, a business can only select one customer. Customer resource demand is divided into four levels, each level of demand is different, it pays different prices.)