[백준] 5052 - 전화번호 목록 (파이썬)

TheNumber = int(input())
total_answer = []
def check(array):
    for i in range(len(array)-1):
        leng = len(array[i])
        if array[i] == array[i+1][0:leng]:
            return True

for _ in range(TheNumber):
    answer = ''
    n = int(input())
    array = []
    for _ in range(n):
        array.append(input())
    array.sort()
    
    if check(array):
        answer = 'NO'
    else:
        answer = 'YES'
    total_answer.append(answer)

for i in total_answer:
    print(i)