Replace All 's to Avoid Consecutive Repeating Characters: coding question

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Replace each '?' in a lowercase string with a lowercase letter so that no two adjacent characters are equal, without changing the given letters. The problem reduces to making local choices per '?' (avoid its immediate neighbors), and a valid solution is always guaranteed.

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Leetcode 1576. Replace All ?'s to Avoid Consecutive Repeating Characters
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Replace All 's to Avoid Consecutive Repeating Characters

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Replace All 's to Avoid Consecutive Repeating Characters

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