코딩테스트 고득점 Kit - 정렬 2 (Level 2)

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from functools import cmp_to_key

# @cmp_to_key
def cmp(a,b):
    t1 = int(a+b)
    t2 = int(b+a)

    if t1 > t2:
        return 1
    elif t1 < t2:
        return -1
    else:
        return 0

def solution(numbers):
    n = map(str, numbers)
    n = sorted(n, key=cmp_to_key(cmp), reverse=True)
    answer = str(int(''.join(n)))
    return answer