编程介的小学生 2019-05-08 19:59 采纳率: 20.5%
浏览 179

密码加强计算的一个算法的实现的原理,利用C语言的程序编写的代码的过程实现

Problem Description
NCIM Group sponsored problem.

The NCIM Group does a lot of work on IT solutions in defense and security. Good security usually starts with picking a strong password. Generating a password at random is generally a good practice. For example, a password like "2R4eZ9Rqup" is a bit harder to guess than "god", "love", "sex" or "secret".

The problem with passwords consisting of random letters and digits is that they are hard to remember. Instead of using letters and digits it is also possible to generate passwords by putting random words together. Words are easier to remember than letters and digits.

Using a dictionary of 7776 (65) words, a 5-random-word password is about as strong as a 11-random-character password.

77765 = 28430288029929701376 ≈ 3 * 1019

6211 = 52036560683837093888 ≈ 5 * 1019

Some applications hide the password you are typing on the screen by printing dots or asterisks. This allows someone watching your screen to count the number of characters in your password. The NCIM Group wants you to find out whether or not this compromises the strength of your password.

You must write a program that calculates the number of possible passwords that can be generated given:

the dictionary of words, the amount of words used to generate the password and the length of the password.

Input
On the first line an integer t (1 <= t <= 100): the number of test cases. Then for each test case:

One line with three positive integers m (1 <= m <= 7776), n (1 <= n <= 5) and q (1 <= q <= 20): the number of words in the dictionary, the number of words to generate the password, and the number of queries, respectively.

The dictionary: m lines each containing one word wi Each word consists only of lowercase letters. The length of each word will be between 3 and 10 inclusive. No word in the dictionary will be a substring of another word in the dictionary.

q lines each containing a positive integer lj (1 <= lj <= 50), the length observed.

Output
For each test case:

q lines with: the number of possible passwords with length lj . This number will be smaller than 263.

Sample Input
1
4 2 2
aap
noot
mies
piet
7
8

Sample Output
6
9

  • 写回答

0条回答 默认 最新

    报告相同问题?

    悬赏问题

    • ¥15 求差集那个函数有问题,有无佬可以解决
    • ¥15 【提问】基于Invest的水源涵养
    • ¥20 微信网友居然可以通过vx号找到我绑的手机号
    • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
    • ¥15 解riccati方程组
    • ¥15 display:none;样式在嵌套结构中的已设置了display样式的元素上不起作用?
    • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
    • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决
    • ¥50 树莓派安卓APK系统签名
    • ¥65 汇编语言除法溢出问题