// 查找节点的方法booleansearch(intkey){returnsearchRec(root,key);// 从根节点开始递归查找}// 递归查找的辅助函数booleansearchRec(Noderoot,intkey){// 基本情况:如果当前节点为空,返回falseif(root==null){returnfalse;}// 如果找到了关键字,返回trueif(key==root.key){returntrue;}// 根据BST特性继续...
publicTreeNode searchBST(TreeNode root, intval) {if(root ==null|| root.val==val) {returnroot; } Queue<TreeNode> queue = new LinkedList<TreeNode>(); queue.offer(root);while(!queue.isEmpty()) { TreeNode temp = queue.poll();if(temp.val==val) {returntemp; }if(temp.left !=null)...
publicint[]findMode2(TreeNode root){if(root ==null) {returnnewint[0]; }intmax =0; Map<Integer, Integer> map =newHashMap<Integer, Integer>(); Stack<TreeNode> stack =newStack<TreeNode>(); stack.push(root);while(!stack.isEmpty()) { TreeNode node = stack.pop();if(node.left !=...
public void inOrder() { inOrder(root); } private void inOrder(Node node) { if (node == null) { return; } inOrder(node.left); // 遍历的中间访问元素:中序遍历 System.out.println(node.e); inOrder(node.right); } 中序遍历的结果:2 3 4 5 6 8 4. 后序遍历 应用场景:释放内存 //...
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id; added.add(node); node = parent; } } } } return nodes; } public enum DepthFirstSearchOrder { inOrder, preOrder, postOrder } public BinarySearchTree() { this.creator = new INodeCreator<T>() { @Override public Node<T> createNewNode(Node<T> parent, T id) { return new Node<>(...
A guide to the Depth-first search algorithm in Java, using both Tree and Graph data structures. Read more→ 2. Binary Tree A binary tree is a recursive data structure where each node can have 2 children at most. A common type of binary tree is abinary search tree, in which every node...
tree is abinary search tree. If you remember, in BST, the value of nodes in the left subtree is lower than the root, and values of the nodes in the right subtree are higher than the root. TheinOrdertraversal literally means IN order, i.e notes are printed in the order or sorted ...
Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.According to the definition of LCA on Wikipedia:“The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q as descendants (wher...
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. 调用next()将返回二叉搜索树中的下一个最小的数。 Callingnext()will return the next smallest number in the BST.