Retrieve a binary tree from its pre-order and in-order representations
文章目录ProblemSolutionExampleProblemGiventhePre-ordertranversal&In-ordertranversal,retrievetheoriginaltree.SolutionDivide-and-conquerDividetheoriginaltreeintoroot,leftsubtree,rightsubtree.Dothisrecursive