poj 1298 The Hardest Problem Ever

我不是女神ヾ 2022-06-16 02:13 136阅读 0赞

The Hardest Problem Ever

<table> 
 <tbody> 
  <tr> 
   <td><strong>Time Limit:</strong>&nbsp;1000MS</td> 
   <td>&nbsp;</td> 
   <td><strong>Memory Limit:</strong>&nbsp;10000K</td> 
  </tr> 
  <tr> 
   <td><strong>Total Submissions:</strong>&nbsp;26020</td> 
   <td>&nbsp;</td> 
   <td><strong>Accepted:</strong>&nbsp;14084</td> 
  </tr> 
 </tbody> 
</table>

Description

Julius Caesar lived in a time of danger and intrigue. The hardest situation Caesar ever faced was keeping himself alive. In order for him to survive, he decided to create one of the first ciphers. This cipher was so incredibly sound, that no one could figure it out without knowing how it worked.  
  
You are a sub captain of Caesar's army. It is your job to decipher the messages sent by Caesar and provide to your general. The code is simple. For each letter in a plaintext message, you shift it five places to the right to create the secure message (i.e., if the letter is 'A', the cipher text would be 'F'). Since you are creating plain text out of Caesar's messages, you will do the opposite:  
  
  
Cipher text  
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z  
  
Plain text  
V W X Y Z A B C D E F G H I J K L M N O P Q R S T U  
  
Only letters are shifted in this cipher. Any non-alphabetical character should remain the same, and all alphabetical characters will be upper case.

Input

Input to this problem will consist of a (non-empty) series of up to 100 data sets. Each data set will be formatted according to the following description, and there will be no blank lines separating data sets. All characters will be uppercase.  
  
  
A single data set has 3 components:

1.    
    
2.  Start line - A single line, "START"  
    
3.  Cipher message - A single line containing from one to two hundred characters, inclusive, comprising a single message from Caesar  
    
4.  End line - A single line, "END"

Following the final data set will be a single line, "ENDOFINPUT".

Output

For each data set, there will be exactly one line of output. This is the original message by Caesar.

Sample Input

START
    NS BFW, JAJSYX TK NRUTWYFSHJ FWJ YMJ WJXZQY TK YWNANFQ HFZXJX
    END
    START
    N BTZQI WFYMJW GJ KNWXY NS F QNYYQJ NGJWNFS ANQQFLJ YMFS XJHTSI NS WTRJ
    END
    START
    IFSLJW PSTBX KZQQ BJQQ YMFY HFJXFW NX RTWJ IFSLJWTZX YMFS MJ
    END
    ENDOFINPUT

Sample Output

IN WAR, EVENTS OF IMPORTANCE ARE THE RESULT OF TRIVIAL CAUSES
    I WOULD RATHER BE FIRST IN A LITTLE IBERIAN VILLAGE THAN SECOND IN ROME
    DANGER KNOWS FULL WELL THAT CAESAR IS MORE DANGEROUS THAN HE

题目大意：

这个题就是让我们把输入的字母的换成它前五个的那个字母。

题目解析：

这是一个最简单的模拟题了，首先我们要考虑每次输入的第一行，开始与START结束与END，这里可以用一个简单的方法就是用strcmp函数，字符串比较函数，我们去用这个函数比较，当遇到这些字符的时候跳过，当遇到ENDOFINPUT时，输入结束，那么也就是说当遇到这些字符的时候break即可，在利用字符ASCII的特点就可以写出代码，代码也十分简短。

代码：

#include<cstdio>
    #include<cstring>
    #include<iostream>
    using namespace std;
    int main()
    {
        int i;
        char word[100];
        char s[27]={"VWXYZABCDEFGHIJKLMNOPQRSTU"};
        while(1)
        {
            gets(word);
            if(strcmp(word,"START")==0) continue;
            if(strcmp(word,"END")==0) continue;
            if(strcmp(word,"ENDOFINPUT")==0) break;
            for(i=0;word[i]!='\0';i++)
            {
                if(!(word[i]>='A'&&word[i]<='Z')) continue;
                word[i]=s[word[i]-65];
            }
            puts(word);
        }
    
        return 0;
    }