How to Solve Path Sum Problem
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Path Sum
Given the root of a binary tree and an integer targetSum, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals targetSum. A leaf is a node with no c...
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Understanding the Path Sum Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given the root of a binary tree and an integer targetSum, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals targetSum. A leaf is a node with no children.
Path Sum
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Examples
root = [5,4,8,11,null,13,4,7,2,null,null,null,1], targetSum = 22trueThe root-to-leaf path with the target sum is shown.
root = [1,2,3], targetSum = 5falseThere are two root-to-leaf paths in the tree: (1 --> 2): The sum is 3. (1 --> 3): The sum is 4. There is no root-to-leaf path with sum = 5.
root = [], targetSum = 0falseSince the tree is empty, there are no root-to-leaf paths.
Constraints
The number of nodes in the tree is in the range [0, 5000].1000 <= Node.val <= 10001000 <= targetSum <= 1000How Interview Coder Helps with Leetcode Problems
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Frequently Asked Questions
Common questions about solving Path Sum and using Interview Coder during coding interviews.
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