Master Frequency Pattern in Java | Arrays, Strings & Interviews скачать в хорошем качестве

Master Frequency Pattern in Java | Arrays, Strings & Interviews

In this video, we master one of the most important DSA patterns: 👉 Frequency Array & HashMap in Java If you’re preparing for coding interviews, this pattern appears in: Anagram problems Character counting First non-repeating character Sliding window problems Substring frequency problems Understanding when to use a frequency array vs a HashMap can save you time and improve performance in interviews. 🔍 What You’ll Learn: 🟢 Frequency Array (Fastest Approach) When to use int[26], int[128], int[256] How ASCII-based counting works Time & space complexity Why it’s faster than HashMap Best use cases (lowercase, fixed range) 🔵 HashMap Frequency Pattern Using getOrDefault() Counting characters & words Handling Unicode Frequency-based sliding window problems Memory trade-offs 🧠 Interview Comparison Feature Frequency Array HashMap Speed Faster Slightly slower Memory Fixed Dynamic Unicode support Limited Yes Interview use Small alphabets General problems 🎯 Interview Questions Covered Valid Anagram First Unique Character Longest Substring Without Repeating Characters Count Occurrences Frequency-based Sliding Window ⚠️ Common Mistakes Using HashMap for small alphabets (unnecessary overhead) Forgetting getOrDefault Ignoring Unicode characters Wrong array size selection Not handling case sensitivity 📌 Perfect for: Java DSA beginners MCA / BCA / BTech students Placement preparation Coding interview practice Competitive programming 👉 Like, Share & Subscribe for more Java + DSA Roadmap Series 🚀 #Frequency Array #HashMap in Java #Frequency Pattern Java #Java DSA #Arrays and Strings Java #Java Interview Questions #Anagram Java #Sliding Window Java #Java HashMap Tutorial #Java Arrays #Java Programming #DSA Interview Preparation #Coding Interview Java #Learn Java #Placement Preparation #GeeksforGeeks Java