2025-08-14 17:09:09 +0000 UTC

class Solution:
    def largestGoodInteger(self, num: str) -> str:
        max_digit = "\0"
        for index in range(len(num) - 2):
            if num[index] == num[index + 1] == num[index + 2]:
                max_digit = max(max_digit, num[index])
        if max_digit == "\0":
            return ""
        return max_digit * 3