How to Solve Sum Root to Leaf Numbers Problem
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Sum Root to Leaf Numbers
You are given the root of a binary tree containing digits from 0 to 9 only. Each root-to-leaf path in the tree represents a number. For example, the root-to-leaf path 1 -> 2 -> 3 represents the number...
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Understanding the Sum Root to Leaf Numbers Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given the root of a binary tree containing digits from 0 to 9 only. Each root-to-leaf path in the tree represents a number. For example, the root-to-leaf path 1 -> 2 -> 3 represents the number 123. Return the total sum of all root-to-leaf numbers. Test cases are generated so that the answer will fit in a 32-bit integer. A leaf node is a node with no children.
Sum Root to Leaf Numbers
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Examples
root = [1,2,3]25The 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.
root = [4,9,0,5,1]1026The 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.
Constraints
The number of nodes in the tree is in the range [1, 1000].0 <= Node.val <= 9The depth of the tree will not exceed 10.How Interview Coder Helps with Leetcode Problems
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