🔥 LeetCode 25. Reverse Nodes in k-Group || Hard Problem Solved || Python Solution 🚀

🔥 Master one of LeetCode's HARDEST linked list problems! In this complete tutorial, I'll walk you through LeetCode Problem 25: Reverse Nodes in k-Group with a step-by-step explanation of every line of code.

📌 Problem: https://leetcode.com/problems/reverse-nodes-in-k-group/

💡 WHAT YOU'LL LEARN:
✅ How to reverse linked list nodes in groups
✅ Why we use a dummy node in linked list problems
✅ Pointer manipulation techniques for hard problems
✅ O(1) space complexity solution (no recursion!)
✅ How to handle edge cases in linked list reversal
✅ Common bugs and how to fix them
✅ Line-by-line code explanation with visual examples

🎯 PROBLEM DETAILS:
Difficulty: 🔴 Hard
Topic: Linked Lists, Pointers, Two Pointers
Companies: 🏢 Amazon, Google, Microsoft, Facebook, Apple
Acceptance Rate: ~65%
🔑 KEY CONCEPTS COVERED:
- Linked List Reversal in Groups
- Dummy Node Pattern
- Pointer Manipulation
- Space-Optimized Solutions
- Edge Case Handling
- Interview Problem-Solving Strategies

📚 RELATED PROBLEMS TO TRY NEXT:
- LeetCode 206: Reverse Linked List (Easy)
- LeetCode 92: Reverse Linked List II (Medium)
- LeetCode 24: Swap Nodes in Pairs (Medium)
- LeetCode 143: Reorder List (Medium)

💬 Got questions? Drop them in the comments below! I respond to every comment and love helping you understand tough problems.

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