K Sum Paths in Binary Tree | GFG POTD Solution | Prefix Sum + DFS Explained | DSA Interview Problem
Автор: Gopo workspace
Загружено: 2026-03-15
Просмотров: 51
Описание:
In this video, we solve the K Sum Paths problem from Binary Trees, a popular GeeksforGeeks POTD (Problem of the Day) and an important DSA interview question.
We are given the root of a binary tree and a value k, and we must find the number of downward paths whose sum equals k. The path can start from any node but must move only downward (parent → child).
🔥 In this tutorial, you will learn:
• Problem intuition and visualization
• Brute force vs optimal approach
• Prefix Sum + DFS optimization technique
• Step-by-step explanation with example
• Clean and efficient code implementation
This problem is commonly asked in coding interviews and helps strengthen your understanding of binary trees, recursion, and prefix sums.
💡 Perfect for:
• DSA beginners and intermediate programmers
• Coding interview preparation
• GeeksforGeeks POTD practice
• Binary Tree algorithm mastery
🧠 Problem Example
Input:
Binary Tree = [8,4,5,3,2,N,2,3,-2,N,1]
k = 7
Output:
3
Because there are 3 downward paths whose sum equals 7.
⏱ Time Complexity
Optimal Approach: O(N)
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