题解 | 密码验证合格程序

while True:
    try:
        s = input()
        if len(s) < 8:
            print("NG")
            continue
        flag = [0] * 4
        for c in s:
            if c.isdigit():
                flag[0] = 1
            elif c.isupper():
                flag[1] = 1
            elif c.islower():
                flag[2] = 1
            else:
                flag[3] = 1
        if sum(flag) < 3:
            print("NG")
            continue
        isLegal = True
        for i in range (0, len(s) - 2):
            # 只用往后面检查
            if s[i:i+3] in s[i+3:]:
                print("NG")
                isLegal = False
                break
        if isLegal:
            print("OK")
    except:
        break