Implement a function that finds the longest palindromic substring in a given string. Compare at least two approaches with different time-space trade-offs and explain when you'd use each.

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Implement a function that finds the longest palindromic substring in a given string. Compare at least two approaches with different time-space trade-offs and explain when you'd use each.

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