Most Beginners Miss This Simple Greedy Trick

In this video, we solve LeetCode 1323 – “Maximum 69 Number” step by step.

You’ll learn:

* Greedy approach explained simply
* Digit traversal techniques
* How to maximize a number efficiently
* Beginner-friendly problem-solving

Problem:
You are given a positive integer consisting only of digits 6 and 9.

Return the maximum number you can get by changing at most one digit:

* change 6 → 9
* or keep the number unchanged

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⏱ Time Complexity: O(n)
💾 Space Complexity: O(1)

💡 Key Concepts:

* Traverse digits from left to right
* Change the first 6 into 9
* Greedy optimization logic

Why?
Because changing the leftmost 6 gives the maximum increase in value.

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This is a beginner-friendly greedy problem commonly used to improve logical thinking.

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🔗 Connect with me:

LinkedIn: https://www.linkedin.com/in/dashrat-rajpurohit/
X (Twitter): https://x.com/Dashrat_Singh_
GitHub: https://github.com/DashratRajpurohit

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If you're preparing for DSA or coding interviews, understanding greedy optimization patterns is important.

#leetcode #greedy #math #codinginterview #dsa

Видео Most Beginners Miss This Simple Greedy Trick канала Dashrat Rajpurohit