给定一棵树的前序\\中序,构造出该树,并打印出树的后序

//例如,前序:a b d e h i c g 中序:d b h e i a c g-given a tree before the sequence \\ sequence were constructed out of the tree, and print out the following sequence tree / / For example, the former sequence : a, b d e g h i c ORDER : d b e h i g a c