Path Sum (LeetCode 112) Step-by-Step Explanation

In this video, we solve LeetCode Problem 112: Path Sum, a classic binary tree problem that helps you understand Depth First Search (DFS) and recursive traversal. I explain the problem step by step and show how we can recursively check whether a root-to-leaf path exists whose sum equals the target value. This explanation is beginner-friendly and perfect for building confidence with tree problems. What you’ll learn in this video: Understanding root-to-leaf paths in binary trees How DFS works in tree traversal Using recursion to track path sums Step-by-step walkthrough with examples Clean and efficient implementation Time and space complexity explained Problem Summary: Given the root of a binary tree and a target sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the target sum. This problem is a great introduction to binary tree recursion and is commonly asked in coding interviews. 📌 Topics Covered Binary Trees DFS Recursion Tree Traversal #leetcode #pathsum #binarytree #dfs #recursion #codinginterview #dsa #leetcode112