Find Valid Pair of Adjacent Digits in String: coding question

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Find the first adjacent pair of distinct digits in the string (scanned left-to-right) such that each digit's total frequency in the entire string equals its numeric value, and return that two-character pair or an empty string if none exists. Digits are '1'–'9' and length is up to 100.

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Leetcode 3438. Find Valid Pair of Adjacent Digits in String
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Find Valid Pair of Adjacent Digits in String

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Find Valid Pair of Adjacent Digits in String

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