LeetCode 139: Word Break | Java Solution | Dynamic Programming

📝 In this video, I tackle LeetCode 139: Word Break, a classic #dynamicprogramming problem where we need to determine if a string can be segmented into space-separated words from a dictionary. #leetcode #interview #java ⏱️ Optimal Solution: O(n²) time complexity and O(n) space complexity using DP approach ## 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 - Java code walk-through 11:04 - Solution analysis - runtime + memory 11:13 - Conclusion ## Key Concepts 🔑 Dynamic Programming 🔑 String Manipulation 🔑 Memoization 🔑 Bottom-up Tabulation ## Main Learning Points 💡 Breaking down string problems into subproblems 💡 Recognizing overlapping subproblems pattern 💡 Building efficient DP solution with tabulation 💡 Handling edge cases in string segmentation problems ## Related Problems - LeetCode 140: Word Break II - LeetCode 472: Concatenated Words - LeetCode 79: Word Search - LeetCode 212: Word Search II ## Target Audience This video is designed for software engineers preparing for technical interviews, computer science students, and coding enthusiasts looking to strengthen their #dynamicprogramming skills with #java implementations. ## Prerequisites - Basic understanding of Java syntax - Familiarity with arrays and strings - Basic knowledge of recursion - Understanding of dynamic programming concepts ## Useful Links - Problem statement: https://leetcode.com/problems/word-break/ - Solution code: https://leetcode.com/problems/word-break/solutions/6867910/dynamic-programming-solution-in-java-wit-aen9 ## Additional Tips 💯 Pay special attention to how we initialize our DP array 💯 The solution uses bottom-up DP to avoid stack overflow issues 💯 Notice how we optimize lookups by using a HashSet for dictionary words 🔔 If you found this solution helpful, please SUBSCRIBE for weekly coding interview prep videos! Drop your questions and solution approaches in the comments below - I respond to every comment!