https://blog.csdn.net/bqw18744018044/article/details/81871726?utm_medium=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromBaidu~default-16.control&dist_request_id=&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2~default~BlogCommendFromBaidu~default-16.control#完整代码
树、模板、树的遍历、定义
原文：https://www.cnblogs.com/junjie0212/p/14637157.html
