Add optimized Java solution for Valid Parenthesis String (LeetCode 678)#701
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ghostmkg merged 1 commit intoghostmkg:mainfrom Oct 14, 2025
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Hey! I added a Java solution for the LeetCode problem Valid Parenthesis String (678).
Implemented a greedy approach using lower/upper bounds (O(n) time, O(1) space).
Added a two-pass approach as another way to solve it.
Included a main method with sample tests to check different cases.
Code is clean, commented, and easy to understand.
References:
https://leetcode.com/problems/valid-parenthesis-string/
https://leetcode.com/problems/valid-parenthesis-string/solutions/