编程介的小学生 2017-09-18 10:31 采纳率: 20.5%
浏览 872
已采纳

Crypto Columns

Description

The columnar encryption scheme scrambles the letters in a message (or plaintext) using a keyword as illustrated in the following example: Suppose BATBOY is the keyword and our message is MEET ME BY THE OLD OAK TREE. Since the keyword has 6 letters, we write the message (ignoring spacing and punctuation) in a grid with 6 columns, padding with random extra letters as needed:
MEETME
BYTHEO
LDOAKT
REENTH

Here, we've padded the message with NTH. Now the message is printed out by columns, but the columns are printed in the order determined by the letters in the keyword. Since A is the letter of the keyword that comes first in the alphabet, column 2 is printed first. The next letter, B, occurs twice. In the case of a tie like this we print the columns leftmost first, so we print column 1, then column 4. This continues, printing the remaining columns in order 5, 3 and finally 6. So, the order the columns of the grid are printed would be 2, 1, 4, 5, 3, 6, in this case. This output is called the ciphertext, which in this example would be EYDEMBLRTHANMEKTETOEEOTH. Your job will be to recover the plaintext when given the keyword and the ciphertext.
Input

There will be multiple input sets. Each set will be 2 input lines. The first input line will hold the keyword, which will be no longer than 10 characters and will consist of all uppercase letters. The second line will be the ciphertext, which will be no longer than 100 characters and will consist of all uppercase letters. The keyword THEEND indicates end of input, in which case there will be no ciphertext to follow.
Output

For each input set, output one line that contains the plaintext (with any characters that were added for padding). This line should contain no spacing and should be all uppercase letters.
Sample Input

BATBOY
EYDEMBLRTHANMEKTETOEEOTH
HUMDING
EIAAHEBXOIFWEHRXONNAALRSUMNREDEXCTLFTVEXPEDARTAXNAARYIEX
THEEND
Sample Output

MEETMEBYTHEOLDOAKTREENTH
ONCEUPONATIMEINALANDFARFARAWAYTHERELIVEDTHREEBEARSXXXXXX

  • 写回答

1条回答 默认 最新

  • threenewbee 2017-10-02 15:47
    关注
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

报告相同问题?

悬赏问题

  • ¥20 电脑鼠标键盘不好使了
  • ¥15 求糕手!用matlab求解目标规划模型🙏
  • ¥15 画出的分类图不对,求解答一下
  • ¥20 springboot和springcloud版本问题
  • ¥15 ps2手柄控制树莓派小车
  • ¥30 C#:vsto powerpoint的外接程序
  • ¥30 stata将do文件代码转化为ado文件
  • ¥15 两个同维数组相比,不同位置、出现重复比无意义,而不同位置、不出现重复比,则有意义。把有意义的两个数组放入新的集合MK中。
  • ¥15 可以远程电脑安装nvm
  • ¥15 写一个可直接调用的函数,将32位有符号数转成另一个无符号的数