3170. Lexicographically Minimum String After Removing Stars | Leetcode Daily - Python

Ready to solve LeetCode 3170: Lexicographically Minimum String After Removing Stars? This problem seems complex, but we'll break it down with a simple and elegant greedy solution.

In this video, we'll dive into the core logic: when a star appears, how do we choose which character to remove to ensure the final string is as small as possible in dictionary order? The key insight is to always remove the smallest available character's most recent (rightmost) occurrence. This clever trick protects the valuable prefix of our string.

I'll guide you through implementing this strategy in Python using an array of stacks—a perfect data structure for this task. We'll cover the complete code, from processing the string to building the final result, and analyze its O(N) time and space complexity.

Perfect for coding interview preparation and improving problem-solving skills.

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