卡内基梅隆大学SSD3课程，所有exercise答案，全部自写并得到满分，文件夹内的为小型工程，是一些后期练习，文件夹外的为前期的练习，比较简单，故没有入文件夹-Carnegie Mellon University SSD3 courses, and all exercise answers, all self-written and full marks, folders inside for small projects, some post-practice, folders outsid