Leetcode 2696: minimum-string-length-after-removing-substrings -DSA #coding #dsa #codinginterview

In this video, we'll tackle an interesting problem where you're given a string consisting only of uppercase English letters. The goal is to minimize the length of the string by repeatedly removing any occurrence of the substrings "AB" or "CD". We'll walk through an efficient solution using a stack-based approach to dynamically reduce the string length, ensuring we find the minimum possible result.

📌 Problem Overview:

You're allowed to remove substrings "AB" or "CD" in any order.
After removal, the string may concatenate, potentially creating new "AB" or "CD" pairs.
Our task is to return the minimum possible length of the resulting string.
🔑 Key Concepts:

Stack data structure to dynamically manage the string while processing.
Edge case handling for empty strings, strings without removable pairs, and more.
Time complexity: O(n), where n is the length of the string.
👨‍💻 Code Walkthrough: We’ll explore the solution step-by-step, covering:

How to handle edge cases (e.g., empty strings, strings with no pairs).
Using a helper function to check whether a pair can be removed.
Stack-based removal strategy to ensure efficient processing.
📚 Example Test Cases:

Input: "ABFCACDB" → Output: 2
Input: "ACBBD" → Output: 5
Input: "ABABAB" → Output: 0
If you're preparing for coding interviews or competitive programming, this problem is a great example of how to apply stack-based logic to string manipulation problems.

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