采用VS2013构建~单文件，其它版本重新编译即可 包含：识别广义表建立二叉树，层次遍历，及非递归前序遍历~~课后小作业，还比较粗糙-~ Using VS2013 build single-file, other versions recompilation comprising: identifying generalized form established tree, traverse the level, and non-recursive preorder traversal ~