Introduction - If you have any usage issues, please Google them yourself
1) The process established by the first order recursive binary tree (memory structure: binary list) input data sequence obtained by first traversing the input, when a node in the left subtree or right subtree is empty, enter ' *' number, such as Enter abc** d** e** 2) write a recursive algorithm to calculate a binary tree the number of leaf nodes. 3) The concave form by way of the output of the binary tree.