[백준][Python] 5671 호텔 방 번호

set으로 중복체크. 

 

import sys
input = sys.stdin.readline

while 1:
    try:
        N, M = map(int, input().split())
    except:
        break
    ans = 0
    for num in range(N,M+1):
        cnt = set()
        s_num = str(num)
        for char in s_num:
            cnt.add(char)
        if len(s_num) == len(cnt):
            ans += 1
    print(ans)