2024-02-02 16:51:07 +0000 UTC

class Solution:
    def sequentialDigits(self, low, high):
        a = []

        for i in range(1, 10):
            num = i
            next_digit = i + 1

            while num <= high and next_digit <= 9:
                num = num * 10 + next_digit
                if low <= num <= high:
                    a.append(num)
                next_digit += 1

        a.sort()
        return a