Master this problem using the Stacks pattern.
When approaching Longest Valid Parentheses, look for key problem signals that suggest using the Stacks pattern. Focus on reducing redundant iterations, maintaining state invariant, and optimizing space-time complexity.
Key Invariant
Maintain optimal range bounds or hash frequency state during traversal.
Expected Complexity
Time: O(N) or O(N log N) | Space: O(1) to O(N)
Study Resource
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