Lexicographically Smallest String After Deleting Duplicate Characters 🔥 LeetCode 3816 | Optimal

Описание: In this video, we solve LeetCode 3816 – Lexicographically Smallest String After Deleting Duplicate Characters, the hard problem (Q4) from Weekly Contest 485.

Code:
https://leetcode.com/problems/lexicog...

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You are given a string consisting of lowercase English letters, and you can repeatedly choose any character that appears at least twice and delete one occurrence. The goal is to form the lexicographically smallest possible string.

In this solution, we cover:
Frequency counting of characters
Greedy strategy to build the smallest lexicographical string
Deciding when to remove or keep characters
Using StringBuilder efficiently
Handling edge cases correctly
Clean and optimized Java implementation

This problem is a classic example of greedy string manipulation, a very important pattern for LeetCode hard problems and coding interviews.

Watch till the end for a complete and clear explanation.

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