Combination Sum - LeetCode 39 | Backtracking with Reuse in JavaScript | Day 38 скачать в хорошем качестве

Combination Sum - LeetCode 39 | Backtracking with Reuse in JavaScript | Day 38

🎯 Day 38 of My LeetCode Journey | Combination Sum (LeetCode 39) In this video, I solve LeetCode Problem #39 - Combination Sum in JavaScript using BACKTRACKING! This builds perfectly on Day 37's Subsets - now with a twist: we can reuse elements AND we need to hit a specific target sum. Master this variation of the backtracking pattern! 🔗 Problem Link: https://leetcode.com/problems/combina... 📌 PROBLEM DESCRIPTION: Given an array of distinct integers candidates and a target integer target, return a list of all unique combinations of candidates where the chosen numbers sum to target. The same number may be chosen from candidates an unlimited number of times. Two combinations are unique if the frequency of at least one of the chosen numbers is different. Example 1: Input: candidates = [2,3,6,7], target = 7 Output: [[2,2,3],[7]] Explanation: 2 + 2 + 3 = 7. Note that 2 can be used multiple times. Example 2: Input: candidates = [2,3,5], target = 8 Output: [[2,2,2,2],[2,3,3],[3,5]] Example 3: Input: candidates = [2], target = 1 Output: [] 💡 KEY CONCEPTS COVERED: ✅ Backtracking with Reuse ✅ Target Sum Constraint ✅ Avoiding Duplicate Combinations ✅ Decision Tree Pruning ✅ Index-based Recursion ✅ Optimization Techniques 📊 COMPLEXITY: • Time Complexity: O(n^(t/s)) where n=candidates, t=target, s=smallest candidate • Space Complexity: O(t/s) - Recursion depth 🎓 DIFFICULTY: Medium 🏷️ TOPICS: Array, Backtracking 🔗 RELATED VIDEOS: • Day 37: Subsets (Backtracking Foundation!) -    • Subsets - LeetCode 78 | Backtracking Expla...   🔔 SUBSCRIBE for daily LeetCode solutions in JavaScript! 👍 LIKE if you're mastering backtracking! 💬 COMMENT which backtracking problem should be next! --- 📚 MY LEETCODE JOURNEY PLAYLIST:    • Leetcode   🤝 CONNECT WITH ME: • GitHub: https://github.com/ashwinikemshetty • LinkedIn:   / ashwinikemshetty   Subset problem link: --- #LeetCode #CombinationSum #LeetCode39 #Day38 #JavaScript #Backtracking #Recursion #TargetSum #CodingInterview #FAANG #TechInterview #SoftwareEngineering #AlgorithmExplained #100DaysOfCode #JavaScriptTutorial #MediumProblem