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 order traversal进行计算,并...
Github 同步地址: https://github.com/grandyang/leetcode/issues/314 类似题目: Binary Tree Level Order Traversal 参考资料: https://leetcode.com/problems/binary-tree-vertical-order-traversal/ https://leetcode.com/problems/binary-tree-vertical-order-traversal/discuss/76401/5ms-Java-Clean-Solution https...
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,...
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] 3 /\ / \ 9 20 /\ ...
[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....
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(...
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LeetCode 每日一题 Daily Challenge 987 Vertical Order Traversal of a Binary Tree 198 -- 2:46 App LeetCode 每日一题 Daily Challenge 110 Balanced Binary Tree 64 -- 4:15 App LeetCode 每日一题 Daily Challenge 1015 Smallest Integer Divisible by K 106 -- 1:36 App LeetCode 每日一题 Daily ...
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.
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...