return its vertical order traversal as: [ [4], [9], [3,5,2], [20], [7] ] 二叉树的垂直遍历。 解法:如果一个node的column是 i,那么它的左子树column就是i - 1,右子树column就是i + 1。建立一个TreeColumnNode,包含一个TreeNode,以及一个column value,然后用level
原题链接在这里:https://leetcode.com/problems/binary-tree-vertical-order-traversal/ 题目: Given a binary tree, return thevertical ordertraversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left...
Binary Tree Vertical Order Traversal https://leetcode.com/problems/binary-tree-vertical-order-traversal/ 这道题让我们竖直的遍历树,和按层遍历非常相似。我第一次做的时候,使用的是递归的形式,发现顺序会出错。 因此还是要借助按层遍历的思路,将树逐层的加入一个队列,然后再取出来进行处理。 遍历的时候,...
Binary Tree Vertical Order Traversal https://leetcode.com/problems/binary-tree-vertical-order-traversal/ 这道题让我们竖直的遍历树,和按层遍历非常相似。我第一次做的时候,使用的是递归的形式,发现顺序会出错。 因此还是要借助按层遍历的思路,将树逐层的加入一个队列,然后再取出来进行处理。 遍历的时候,...
[LeetCode] 314. Binary Tree Vertical Order Traversal Given therootof a binary tree, returnthe vertical order traversal of its nodes' values. (i.e., from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left to right....
Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left to right. Examples 1: Input: [3,9,20,null,null,15,7] ...
除递归方式遍历二叉树外,另可以借助堆栈(stack)实现二叉树中序、前序、后序遍历,使用队列(queue)实现按层遍历,例如 LeetCode题目 94. Binary Tree Inorder Traversal: // 94. Binary Tree Inorder Traversal vector<int> inorderTraversal(TreeNode* root) { vector<int> res; stack<TreeNode*> st; while(...
Given a binary tree, print it vertically. The following example illustrates vertical order traversal. 1 / \ 2 3 / \ / \ 4 5 6 7 \ \ 8 9 The output of print this tree vertically will be: 4 2 1 5 6 3 8 7 9 1. 2.
0094-Binary-Tree-Inorder-Traversal 0095-Unique-Binary-Search-Trees-II 0096-Unique-Binary-Search-Trees 0098-Validate-Binary-Search-Tree 0099-Recover-Binary-Search-Tree 0100-Same-Tree 0101-Symmetric-Tree 0102-Binary-Tree-Level-Order-Traversal 0104-Maximum-Depth-of-Binary-Tree 0105...
Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left to right. Examples: Given binary tree [3,9,20,null,null,15,7], 3 /\ / \ 9...