78. Subsets | leetcode 78 | Generate All Subsets using Recursion & Backtracking | 2^n Subsets

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In this video, we solve the classic Subset Generation problem using Recursion + Backtracking in Java. Given an array of size n, we generate all possible 2^n subsets, including the empty set and the set itself.

🔍 What you’ll learn:

Recursive Tree approach to subset generation

Backtracking step to undo choices

How each element contributes to 2 paths: Pick or Not Pick

Why total subsets = 2^n

Clean and beginner-friendly Java code explanation

💡 Example:
Input: [1, 2, 3]
Output: All 8 subsets (2^3):
[[], [1], [2], [3], [1,2], [1,3], [2,3], [1,2,3]]

📌 This problem is a foundation for solving more complex recursion/backtracking problems like combinations, permutations, and subset sum.

🔥 Don’t forget to check out the full playlist for more beginner-friendly recursion and backtracking problems!

#Java #Recursion #Backtracking #Subsets #CodingXKrishna #DSA #SubsetProblem #RecursionExplained

codingX krishna

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Subset generation finally made sense after this! The pick/not pick logic and backtracking steps were super clear. Loved the way you explained the 2ⁿ part too.

cyno

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