🚀 Day 4 – 40 Days DSA Challenge | LeetCode 189 – Rotate Array
In today’s problem, we solve the famous Rotate Array question using the most optimal in-place approach with O(1) extra space.
Problem:
Given an integer array nums, rotate the array to the right by k steps.
🔥 In this video you’ll learn:
• Why brute force gives TLE
• The powerful 3-step reverse technique
• How in-place rotation works
• Time & Space Complexity analysis
• Dry run with examples
✅ Optimal Approach Used:
1. Reverse complete array
2. Reverse first k elements
3. Reverse remaining elements
⏱ Time Complexity: O(n)
📦 Space Complexity: O(1)
📌 LeetCode Submission Link:
https://leetcode.com/problems/rotate-array/submissions/1996597605/
📌 LeetCode Profile:
https://leetcode.com/u/TapanVachhani/
📌 GitHub:
https://github.com/Vachhani-Tapan
📌 LinkedIn:
https://www.linkedin.com/in/tapanvachhani/
🔥 Follow the complete 40 Days DSA Challenge for daily LeetCode solutions and interview preparation.
