LeetCode 322: Coin Change | CSharp Solution | Dynamic Programming

📝 In this video, I tackle the classic #coinchange problem - finding the minimum number of coins needed to make up a specific amount using a dynamic programming approach. #leetcode #dp #csharp ⏱️ **Time Complexity**: O(amount * number of coins) 🧮 **Space Complexity**: O(amount) ## TIMESTAMPS 00:00 - Understanding problem statement 00:57 - Backtracking + Greedy Algorithm 02:27 - Big O Notation calculated 03:30 - Using Dynamic Programming 08:51 - Big O Notation 09:26 - C# solution walk-through 10:45 - Solution analysis - runtime + memory 10:53 - Conclusion ## KEY CONCEPTS - 🔹 Dynamic Programming with tabulation - 🔹 Bottom-up approach - 🔹 Subproblem optimization - 🔹 Infinite supply of coins (unbounded knapsack variation) ## MAIN TAKEAWAYS - 💡 How to build a DP solution for minimization problems - 💡 Using array initialization tricks for min/max problems - 💡 Recognizing coin change as a classic DP pattern - 💡 Optimizing space complexity in DP solutions ## RELATED PROBLEMS - LeetCode 518: Coin Change 2 (combinations count) - LeetCode 416: Partition Equal Subset Sum - LeetCode 377: Combination Sum IV - LeetCode 279: Perfect Squares ## TARGET AUDIENCE This video is designed for software developers preparing for coding interviews, especially those focusing on dynamic programming concepts and #csharp implementations. ## PREREQUISITES - Basic understanding of arrays and loops in C# - Familiarity with dynamic programming concepts (recommended) - Understanding of recursion and memoization ## USEFUL LINKS - LeetCode problem: https://leetcode.com/problems/coin-change/ - Solution code: https://leetcode.com/problems/coin-change/solutions/6859846/dynamic-programming-coin-change-solution-t6ty ## ADDITIONAL TIPS - Pay attention to the base cases (especially amount = 0) - Watch for potential integer overflow issues - Consider the order of coin processing (it doesn't matter in this problem, but does in variations) 🙏 If you found this solution helpful, please LIKE and SUBSCRIBE for more coding interview preparation videos! Drop your questions in the comments below, and let me know which LeetCode problems you'd like me to cover next! #dynamicprogramming #codinginterviews #algorithms