思路：类似于插入排序，每增加一个元素i，判断i与i-0全部数据所能组成的最小数，依次交换

class Solution:
    def PrintMinNumber(self , numbers: List[int]) -> str:
        # write code here
        
        if len(numbers) == 0:
            return ""
        
        for i in range(1, len(numbers)):
            j = i - 1
            
            while j >= 0:
                if int(str(numbers[j]) + str(numbers[j+1])) > int(str(numbers[j+1]) + str(numbers[j])):
                    numbers[j+1], numbers[j] = numbers[j], numbers[j+1]
                j -= 1
        
        result = [str(i) for i in numbers]
        return "".join(result)