教室的墙壁上贴着新学期的课表，一本本新书中，有好多好多的知识果实等待着我们去采撷。

On the walls of the classroom of the new term YiBenBen new book, schedule, a lot of knowledge fruit is waiting for us to gather.

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可把排课表问题分成两个层次进行，首先选择合适时间，然后再根据这个时间进行教室调度。

We can divide the timetable problem into two layers to solve. At first we should select a suitable time slice, and then according to the time slice we proceed to schedule the classrooms.

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