python3 代码

class Solution(object):
    def printMinNumber(self, nums):
        """
        :type nums: List[int]
        :rtype: str
        """
        if not nums:
            return ''
        nums = [str(x) for x in nums]
        from functools import cmp_to_key
        nums = sorted(nums, key=cmp_to_key(lambda x, y: int(x + y) - int(y + x)))
        return ''.join(nums).lstrip('0') or '0'  # 去除输入中可能存在的0，如果只有'0'，则返回'0'