Strings DSA 🔥 3 Must-Solve LeetCode Problems in Java | Day 9/30

Day 9 of Android30 × Pattern30! Today we're solving 3 important String problems in Java with clear logic, dry runs, optimized approaches and time & space complexity. *Problems covered:* 1. Group Anagrams — LeetCode 49 2. Longest Palindromic Substring — LeetCode 5 3. Longest Happy Prefix — LeetCode 1392 *Concepts covered:* HashMap and frequency counting Expand Around Center KMP Algorithm LPS (Longest Prefix Suffix) Array Note: String to Integer (atoi) is not covered in this video. Which of these three problems did you find the trickiest? Comment below! #Java #DSA #LeetCode #StringAlgorithms #CodingInterview #Android30 #Pattern30