Leetcode 2264. Largest 3-Same-Digit Number in String

Given a numeric string, return the largest "good" integer — a length-3 substring made of the same repeated digit (leading zeros allowed) — or "" if none exist. Because all candidates have length 3, the maximum is determined solely by the repeated digit value.

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Leetcode 2264. Largest 3-Same-Digit Number in String

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