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🔥 LeetCode 1437 – Check If All 1's Are at Least Length K Places Away | DSA Explanation
In this video, we break down the LeetCode problem 1437: Check if All 1’s Are at Least K Places Away with a clear, simple, and beginner-friendly walkthrough.

You’ll learn:
✅ What the problem is really asking
✅ How to track the gap between consecutive 1’s
✅ Efficient linear-time solution using one pointer
✅ Common mistakes and edge cases
✅ Full dry-run on sample input for better understanding

💡 Problem Summary

You are given a binary array nums and a number k.
You must check whether every pair of 1s in the array are at least k positions apart.

Key idea:

Keep track of the index of the previous 1

For every new 1, check if the gap is ≥ k + 1

If any pair violates this, return false