教学计划规划程序，C语言编写，通过事先规定要选修的课程以及各个课程之间存在的先修关系，通过关键路径寻找学生的开课课表。-Teaching program planning process, C language, through the elective courses to be provided in advance and various pre-existing relationship between curriculum, through the critical path looking for students of class curriculum.