题解 | #密码验证合格程序#

#哇，这道中等题我居然一次就过了，可喜可贺！
import sys

for line in sys.stdin:
    a = line.split()
    if len(a[0]) <= 8:
        print("NG")
        continue

    three_four = 0
    for i in a[0]:
        if i.islower():
            three_four += 1
            break

    for i in a[0]:
        if i.isnumeric():
            three_four += 1
            break

    for i in a[0]:
        if i.isupper():
            three_four += 1
            break

    for i in a[0]:
        if i.isalpha() or i.isnumeric() or i.isupper():
            three_four = three_four
        else:
            three_four += 1
            break

    if three_four < 3:
        print("NG")
        continue

    seen_substrings = set()
    more = False
    for i in range(len(a[0]) - 2):
        substring = a[0][i : i + 3]
        if substring in seen_substrings:
            print('NG')
            break
        seen_substrings.add(substring)
        if i == len(a[0]) - 3:
            print('OK')
            break