LeetCode Day 16 - Wildcards Bracket String (I Struggle)

In problem "Valid Parenthesis String", you need to replace characters '*' with opening and closing brackets (or remove them) in order to get a valid bracket sequence. It's the first time when I don't know how to solve a problem and I need to guess, and then think much longer to understand what happened.
Leetcode holds a 30-day Challenge in April with a new coding interview problem appearing each day, here's contest link: https://leetcode.com/explore/featured...

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