Reverse a Linked List in 30s | LeetCode 206 #programming #leetcode

It is the most famous coding interview question in the world: Reverse a Linked List (LeetCode 206). 🤯

Most beginners panic and try to move the actual data around, or they try to copy the nodes into a brand new Array. That wastes memory!

The secret? You don't move the data. You just flip the arrows! 🔄

By using the "Three Pointer Technique", you can solve this in O(1) space and O(N) time: 1️⃣ PREV Pointer (Starts at Null) 2️⃣ CURR Pointer (Starts at Head) 3️⃣ NEXT Pointer (Saves the rest of the list)

At every step, you temporarily save the Next node, break the Current node's forward arrow, and point it backward to Prev. Then, you just shift all three pointers one step to the right!

Once the Current pointer hits Null, your Prev pointer is sitting exactly on the brand New Head of the list. Done! 🎯

Visualizing computer memory and pointers makes Data Structures and Algorithms (DSA) so much easier to understand.

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Did this visual finally make Linked Lists click for you? Let me know in the comments! 🚀 . . . #linkedlist #leetcode #coding #programming #softwareengineer #computerscience #dsa #python #java #krcodex #developer #tech #codinginterview #learntocode #softwaredevelopment #leetcode206 #programmer

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