from functools import cmp_to_key


def largest_number(nums):
    arr = list(map(str, nums))

    def cmp(a, b):
        if a + b < b + a:
            return 1
        if a + b > b + a:
            return -1
        return 0

    arr.sort(key=cmp_to_key(cmp))
    res = "".join(arr)
    return "0" if res[0] == "0" else res


if __name__ == "__main__":
    print(largest_number([10, 2]))
    print(largest_number([3, 30, 34, 5, 9]))
    print(largest_number([0, 0]))