Скачать или смотреть Sum Root to Leaf Numbers | Morris Preorder | Day 26 | [ June LeetCoding Challenge ] [ Leetcode

The day 26 problem in June Leetcoding Challenge. ( Sum Root to Leaf Numbers ).

Understanding Preorder Recursion ( 0:34 )
What is Morris Preorder Traversal? ( 1:53 )

Problem statement:
Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number.

An example is the root-to-leaf path 1-2-3 which represents the number 123.

Find the total sum of all root-to-leaf numbers.

Note: A leaf is a node with no children.

Example:
Input: [1,2,3]
1
/ \
2 3
Output: 25
Explanation:
The root-to-leaf path 1-2 represents the number 12.
The root-to-leaf path 1-3 represents the number 13.
Therefore, sum = 12 + 13 = 25.

Example 2:
Input: [4,9,0,5,1]
4
/ \
9 0
/ \
5 1
Output: 1026
Explanation:
The root-to-leaf path 4-9-5 represents the number 495.
The root-to-leaf path 4-9-1 represents the number 491.
The root-to-leaf path 4-0 represents the number 40.
Therefore, sum = 495 + 491 + 40 = 1026.

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