classSolution {public: vector<int> postorderTraversal(TreeNode *root) { vector<int>res;if(root==NULL)returnres; stack<pair<TreeNode*,int>>s;intunUsed; s.push(make_pair(root,1));while(!s.empty()) { root=s.top().first; unUsed=s.top().second; s.pop();if(unUsed){ s.push(make...
}/*** NLR:前序遍历(Preorder Traversal 亦称(先序遍历)) * 访问根结点的操作发生在遍历其左右子树之前。*/publicvoidpreOrderTraversal() {//NSystem.out.print(this);//Lif(this.leftSubNode !=null) {this.leftSubNode.preOrderTraversal(); }//Rif(this.rightSubNode !=null) {this.rightSubNode.p...
left); traversal(root.right); result.add(root.val); } } 复杂度分析 时间复杂度:O(n),其中 n 是二叉树的节点数。每一个节点恰好被遍历一次 空间复杂度:O(n),为递归过程中栈的开销,平均情况下为 O(logn),最坏情况下树呈现链状,为 O(n) 迭代法 /** * Definition for a binary tree node....
private void pushAllTheLeft(Stack<TreeNode> s, TreeNode root){ s.push(root); while(root.left!=null){ root = root.left; s.push(root); } } } Binary Tree Postorder Traversal Given a binary tree, return the postorder traversal of its nodes' values. For example: Given binary tree {1,...
publicList<Integer>postorderTraversal(TreeNoderoot){List<Integer>list=newArrayList<>();Stack<TreeNode>stack=newStack<>();TreeNodecur=root;TreeNodelast=null;while(cur!=null||!stack.isEmpty()){if(cur!=null){stack.push(cur);cur=cur.left;}else{TreeNodetemp=stack.peek();//是否变到右子树if...
push(NULL); 29 int nLevelCount = 1; 30 while (true) { 31 TreeNode *pTemp = tree_queue.front(); 32 tree_queue.pop(); 33 if (pTemp == NULL) { 34 if (nLevelCount%2 == 0) { //if the num of level is odd, swap the ivec; 35 Swap(ivec); 36 } 37 tree_vector.push_...
Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree [3,9,20,null,null,15,7], 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
binary-tree/traversal/same-tree Same Tree 描述 Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 分析...
complicatedboundary. Keywords CrosspointBoundarytrackingEdgeBinaryimage 0引言 目标的边缘信息在模式识别和计算机视觉中都占有重要地 位,边界的确定对图像的分析和理解都非常重要。边界跟踪是 由图像中目标区域的一个边缘点出发,搜索并连接边缘点进而 检测到所有边缘点的方法 [1] 。它属于图像分割技术的范畴,是 图像工程...
Tree traversalis the process of visiting each node in the tree exactly once. Visiting each node in a graph should be done in a systematic manner. If search result in a visit to all the vertices, it is called a traversal. There are basically three traversal techniques for a binary tree th...