Question Link : https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/

Difficulty: Medium

Premium: False

Question

Given two integer arrays preorder and inorder where preorder is the preorder traversal of a binary tree and inorder is the inorder traversal of the same tree, construct and return the binary tree.   Example 1:

Input: preorder = [3 …

Continue reading

Question Link : https://leetcode.com/problems/binary-tree-preorder-traversal/

Difficulty: Easy

Premium: False

Question

Given the root of a binary tree, return the preorder traversal of its nodes' values.   Example 1:

Input: root = [1,null,2,3] Output: [1,2,3] Explanation:

Example 2:

Input: root = [1,2,3,4,5,null …

Continue reading