just greedy, every time choose max element currently, and judge the sum ...

here is my thought this is a dp problem, in order to get min white tiles...

毕业两年才发现自己已经成为每天为生活奋斗的青年人，像各种小说、电视里描写的那样，住在狭小的出租屋里，每天搭乘着公交、地铁，往返于公司和“家”之间...