(파이썬) 프로그래머스 - 불량 사용자

answer = 0
def solution(user_id, banned_id):
    array = []
    a = []
    
    def DFS(v,a):
        global answer
        if v==len(banned_id):
            k = sorted(a)
            if k not in array:
                array.append(k)
                answer += 1
            return
        
        for i in range(len(user_id)):
            if len(user_id[i]) == len(banned_id[v]):
                t = 0
                for j in range(len(banned_id[v])):
                    if banned_id[v][j] != "*":
                        if user_id[i][j] != banned_id[v][j]:
                            t = 1
                
                if t == 0:
                    a.append(i)
                    temp = user_id[i]
                    user_id[i] = ""
                    DFS(v+1,a)
                    a.pop()
                    user_id[i] = temp
    DFS(0,a)
    return answer