摘要： 问题： Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. For example: Given the below binary tree, Retu 阅读全文

摘要： 问题： Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number. An example is the root-to-leaf path1->2->3whic 阅读全文

摘要： 问题： Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node down to the neares 阅读全文

摘要： 问题： Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree{1,#,2,3}, return[3,2,1]. 递归方法： 非递归方法（利用栈） 阅读全文

摘要： 问题： Given a binary tree, return the preorder traversal of its nodes' values. For example: Given binary tree{1,#,2,3}, return[1,2,3]. 递归方法： 非递归方法（利用栈）： 阅读全文