Leetcode 216 - Combination Sum III | Recursion & Backtracking JavaScript Solution

Learn how to solve LeetCode 216: Combination Sum III using recursion and backtracking in JavaScript.
The problem: Find all unique combinations of k numbers (from 1 to 9, used once) that sum up to a target n. No duplicate combinations.
We’ll cover:

How to implement recursive backtracking for combinations

Pruning: When to stop and skip branches

Why sorting and order matter

Real interview insights and dry runs

📌 Example:
Input: k = 3, n = 7
Output: [[1,2,4]]
Input: k = 3, n = 9
Output: [[1,2,6],[1,3,5],[2,3,4]]

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