根据片段作业
http://www.jianshu.com/p/caa5cc434be9
http://www.jianshu.com/p/4eb0c3504942
http://www.jianshu.com/p/855b309c1f7d
http://www.jianshu.com/p/aaebcc5a7efa
得出的塔楼
根据片段作业
http://www.jianshu.com/p/caa5cc434be9
http://www.jianshu.com/p/4eb0c3504942
http://www.jianshu.com/p/855b309c1f7d
http://www.jianshu.com/p/aaebcc5a7efa
得出的塔楼