LeetCode 39 | Combination Sum | Java | Recursion + Backtracking 🔥

LeetCode 39 | Combination Sum | Java | Recursion + Backtracking In this video, I solve LeetCode 39 - Combination Sum using recursion and backtracking in Java. The goal is to find all unique combinations of candidates whose sum equals the given target. The main idea is to explore different choices using recursion: TAKE: Include the current candidate and reduce the target by its value. REUSE: Keep the same index because each candidate can be used multiple times. BACKTRACK: Remove the last selected element to restore the previous combination. SKIP: Move to the next candidate without changing the target. When the target becomes zero, we have found a valid combination and add a copy of it to the answer. Topics Covered: LeetCode 39 Combination Sum Recursion in Java Backtracking in Java Include and Exclude Approach Take and Skip Recursion ArrayList in Java HashSet in Java Base Case in Recursion Duplicate Combinations DSA for Beginners LeetCode Medium Problems Java DSA Coding Interview Preparation Data Structures and Algorithms Time Complexity: Exponential in the worst case, depending on the candidate values and target. Space Complexity: Depends on the recursion depth and the number of combinations stored. GitHub: https://github.com/PranavSharma1008 LinkedIn:   / pranavsharma1008   #LeetCode #LeetCode39 #CombinationSum #Java #DSA #Recursion #Backtracking #Coding #JavaProgramming #LeetCodeSolutions #DSAJava #CodingInterview