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The Hardest Problem Ever
Time Limit: 2000/1000 MS (Java/Others)
Memory Limit: 65536/32768 K (Java/Others)
Problem 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 textA B C D E F G H I J K L M N O P Q R S T U V W X Y ZPlain textV 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:
Start line - A single line, "START"
Cipher message - A single line containing from one to two hundred characters, inclusive, comprising a single message from Caesar
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
答案
①读题:
这是一个英文题，直接读就行，读完发现是字符串替换问题。
②想出思路：
用一个字符数组存储“Plain text”，循环遍历原字符串中的每个字符，替换即可。
③动手编程：
④测试样例：
⑤提交代码：
进入下面的链接提交代码：
http://acm.hdu.edu.cn/showproblem.php?pid=1048
⑥返回评测结果：
至此，这道题我们就已经完成了。
本题总结
碰到英文题直接读，没必要每个单词都必须认识，可能和题目无关或者对做题没影响，有时候题目描述看着不少，但题目的意思也就一句话，比如本题就是给出替换方式，把输入的字符串挨个字符替换。这里也用到了一些字符串函数，比如strcpy()、gets()、strcmp()，判断字符的函数isalpha()，平时边做题边积累，不懂的用法就上网查，多做英文题，提高读题熟练度，也能摸索出诀窍。
未完待续
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