The steps of software development are: at first, link the database and auto-count the volume and the density of each encasement then sort descending the encasement according to the density.

• 软件的实现步骤为：首先连接数据库并据密度贪婪算法自动计算每件货物的体积、密度，然后将货物记录按密度降序排序。