correct order (last-opened, first-closed — the LIFO property). 1. Build a mapping from each closing bracket to its expected opening partner. 2. Iterate over every character in the string. - If it is ...
Given a string containing only '(' and ')', return the length of the longest valid (well-formed) parentheses substring. - All '(' or all ')' → 0. - Single character → 0. Pattern: Dynamic Programming — ...
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