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 (See examples).
Given an integer array nums where the elements are sorted in ascending order, convert it to a height-balanced binary search tree.
Example 1
Input: nums = [-10, -3, 0, 5, 9]
Output: [0, -3, 9, -10, null, 5]
Explanation: [0, -10, 5, null, -3, null, 9] is also accepted:
Given a binary search tree (BST), find the lowest common ancestor (LCA) node 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 (where we allow a node to be a descendant of itself)."
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 children is separated by the null value (See examples).
Example 1
Input: root = [1, null, 3, 2, 4, null, 5, 6]
Output: [[1], [3, 2, 4], [5, 6]]
