1.因为二叉搜索树的特性,将preorder数组排序,得到inorder。再将inorder的元素和下标用map存储起来,再对其进行递归。 2.利用二叉树的特性,初始化最小值,最大值,进行递归 3.用栈结构进行迭代。 classSolution {int[] preorder;intidx = 0; Map<Integer, Integer> map_inorder =newHashMap<>();publicTreeNode...
Return the root node of a binary search tree that matches the given preorder traversal. (Recall that a binary search tree is a binary tree where for every node, any descendant of node.left has a value < node.val, and any descendant of node.right has a value > node.val. Also recall ...
Leetcode-1008 Construct Binary Search Tree from Preorder Traversal(先序遍历构造二叉树) 这题应该叫先序遍历构建二叉搜索树。第一个肯定是根节点,往后找第一个比根节点大的数,那个就是右子树的根节点。根节点下一个就是左子树根节点。左子树根节点到右子树根节点之间就是左子树,右子树根节点到最后就是右子树...
题目地址:https://leetcode.com/problems/construct-binary-search-tree-from-preorder-traversal/ 题目描述 Return the root node of a binary search tree that matches the givenpreordertraversal. (Recall that a binary search tree is a binary tree where for every node, any descendant ofnode.lefthas a...
题目链接:Construct Binary Search Tree from Preorder Traversal 题目大意:给定一个二叉树的前序遍历,要求给出对应的二叉搜索树 题目思路:我们可以知道,对于给定的前序遍历,遍历的顺序是前左右,所以对于一个前序序列,第一个数一定就是根节点,然后后面有一段序列是左子树,剩下的序列是右子树,又因为...
* type TreeNode struct { * Val int * Left *TreeNode * Right *TreeNode * } */funcbstFromPreorder(preorder[]int)*TreeNode{iflen(preorder)==0{returnnil}root:=&TreeNode{Val:preorder[0]}p:=1for;p<len(preorder);p++{ifpreorder[p]<preorder[0]{}else{break}}root.Left=bstFromPre...
leetcode 1008 Construct Binary Search Tree from Preorder Traversal 1.题目描述 2.解题思路 3.Python代码 1.题目描述 返回与给定先序遍历 preorder 相匹配的二叉搜索树(binary search tree)的根结点。 (回想一下,二叉搜索树是二叉树的一种,其每个节点都满足以下规则,对于 node.left 的任...【...
printInOrder(searchTree.tree); // 1->2->3->4->5->6->7-> } } (二)、二叉查找树的查找操作 我们先取根节点,如果它等于我们要查找的数据,那就返回。如果要查找的数据比根节点的值小,那就在左子树中递归查找;如果要查找的数据比根节点的值大,那就在右子树中递归查找。 public class BinarySearch...
Preorder traversal Inorder traversal Postorder traversalEssentially, all three traversals work in roughly the same manner. They start at the root and visit that node and its children. The difference among these three traversal methods is the order with which they visit the node itself versus ...
Preorder traversal Inorder traversal Postorder traversalEssentially, all three traversals work in roughly the same manner. They start at the root and visit that node and its children. The difference among these three traversal methods is the order with which they visit the node itself versus ...