Check if a Parentheses String Can Be Valid: coding question

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Given a parentheses string where some characters are fixed and others can be flipped, determine whether you can change the unlocked positions to form a valid parentheses sequence. The core challenge is managing the range of possible open-parenthesis balances as you scan the string (with parity/length constraints), typically solved by a linear greedy check.

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Leetcode 2116. Check if a Parentheses String Can Be Valid
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Check if a Parentheses String Can Be Valid

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Check if a Parentheses String Can Be Valid

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