LeetCode 139: Word Break | CSharp Solution | Dynamic Programming

📝 In this problem, we need to determine if a string can be segmented into words from a given dictionary. An elegant #dynamicprogramming approach helps us solve this efficiently with optimal #memoization. ⏱️ **Time Complexity**: O(n²), where n is the length of the string 💾 **Space Complexity**: O(n) for our DP array ## TIMESTAMPS 00:00 - Understanding problem statement 01:07 - Brute Force Approach 03:02 - Big O Notation calculated 03:29 - Using Dynamic Programming 04:36 - DP - Running simulation 09:10 - Big O Notation calculated 09:48 - C# code walk-through 11:04 - Solution analysis - runtime + memory 11:12 - Conclusion ## KEY CONCEPTS - Dynamic Programming - Memoization - String manipulation - Dictionary lookups - Bottom-up approach ## LEARNING POINTS - How to recognize when to use dynamic programming for string problems - Efficient handling of dictionary lookups using HashSet - Converting recursion with overlapping subproblems to DP - Optimizing space complexity in string segmentation problems ## RELATED PROBLEMS - LeetCode 140: Word Break II - LeetCode 472: Concatenated Words - LeetCode 1048: Longest String Chain - LeetCode 2707: Extra Characters in a String ## TARGET AUDIENCE This video is ideal for software engineers preparing for technical interviews, C# developers looking to improve algorithm skills, and computer science students studying dynamic programming concepts. ## PREREQUISITES - Basic understanding of C# syntax - Familiarity with arrays and HashSets - Understanding of recursion - Fundamental knowledge of dynamic programming concepts ## LINKS 📋 Problem: https://leetcode.com/problems/word-break/ 💻 Solution Code: https://leetcode.com/problems/word-break/solutions/6867905/dynamic-programming-solution-in-c-with-v-l8hw ## ADDITIONAL TIPS - Pay special attention to handling the base case in the DP solution - Watch for time limits when dealing with very long input strings - Consider using a Trie data structure for an alternative approach when dictionary is very large 🔔 If you found this solution helpful, please SUBSCRIBE to the channel and hit the notification bell! Share your questions or alternative approaches in the comments below. #leetcode #csharp #dynamicprogramming #codinginterview #algorithms