求二叉树前序遍历序列中第k个结点的值 c语言程序，已测试

C语言数据结构 输入前序和中序，输出后序遍历 遍历二叉树的一个程序-Preamble and in the sequence in the C language data structure input, the output after the preorder traversal binary tree of a program

C语言实现的数据结构中二叉树的前序遍历、中序遍历和后序遍历以及几种排序算法-C language data structure binary tree before preorder, preorder and postorder and several sorting algorithm