# Day 27 of July LeetCode Challenge

1 min readJul 27, 2020

Given inorder and postorder traversal of a tree, construct the binary tree.

**Note:**

You may assume that duplicates do not exist in the tree.

For example, given

`inorder = [9,3,15,20,7]`

postorder = [9,15,7,20,3]

Return the following binary tree:

`3`

/ \

9 20

/ \

15 7