https://leetcode-cn.com/problems/n-ary-tree-preorder-traversal/ Given the root of an n-ary tree, return the preorder traversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal. Each group of children is separated by the null value (See exa...
Can you solve this real interview question? N-ary Tree Level Order Traversal - Given an n-ary tree, return the level order traversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal, each group of childre
Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value...
Design an algorithm to serialize and deserialize an N-ary tree. An N-ary tree is a rooted tree in which each node has no more than N children. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that an N-ary tree can be seri...
The depth of the tree is at most1000. The total number of nodes is at most5000. 这道题给了我们一棵N叉树,让我们对其进行层序遍历。我们做过之前二叉树的层序遍历的那道题的话Binary Tree Level Order Traversal,那么这道题也就不难了。虽说现在每一个结点可能有很多个子结点,但其实处理的思路的都是一...
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除root以外,每个结点有且仅有一个parent,即出现在children中恰好一次。可以使用一个unordered_set加入所有结点,然后删去所有children,最后剩下一个就是root。 该哈希集方法时间复杂度O(N),空间复杂度O(N)。 哈希集 还可以进一步降低为constant空间复杂度。该题目相当于在一个数组里,其中一个数出现了一次,其它的数...
LeetCode - N叉树的后序遍历 LeetCode第590题,N叉树的后序遍历,只要会后序遍历,这题就不难。 原题地址:https://leetcode-cn.com/problems/n-ary-tree-postorder-traversal/ 题目描述: 给定一个 N 叉树,返回其节点值的后序遍历。 例如,给定一个 3叉树 :...
[LeetCode] 590. N-ary Tree Postorder Traversal Given an n-ary tree, return thepostordertraversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples)....
[LeetCode] 589. N-ary Tree Preorder Traversal Given an n-ary tree, return thepreordertraversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See examples)....