Group Anagrams is a classic Hash Map pattern — this video explains the "canonical key" trick that makes it O(n·k log k), with full visual breakdown.
What you'll learn:
✅ What a canonical key is and why sorted characters work as a map key
✅ How a Hash Map groups words by their sorted signature
✅ Visual walkthrough: ["eat","tea","tan","ate","nat","bat"] → grouped output
✅ Python implementation using defaultdict
✅ Why this pattern appears in real ML data preprocessing
🧠 Practice this problem yourself:
👉 https://codedive.in/group-anagrams
🚀 codedive.in — 207 curated DSA problems for AI/ML engineers. Same letters, same key — now you understand why.
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⏱ Timestamps:
0:00 - Problem Statement
0:30 - Canonical Key Idea
1:00 - Visual Walkthrough
2:00 - Python Code
2:30 - Complexity Analysis
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#GroupAnagrams #LeetCode49 #HashMap #CanonicalKey #DSAInterview #AIMLEngineer #LeetCode #PythonDSA #CodingInterview
