【王道机试】字符串-简单密码-北京大学

OJ：简单密码

示例1
输入：

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

输出：

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

注意对START、END 及 ENDOFINPUT 的处理即可，其余部分与密码翻译一题类似。

代码如下：

#include<iostream>
#include<algorithm>
using namespace std;
int main(){string str;while(getline(cin,str)){        //START ENDOFINPUTif(str=="ENDOFINPUT") break;getline(cin,str);for(int i=0;i<str.size();i++){if(str[i]>='F' && str[i]<='Z')str[i]-=5;else if(str[i]<='E' && str[i]>='A')str[i]+=21;/*if(str[i]>='A' && str[i]<='Z')str[i]=(str[i]-'A'-5+26)%26+'A';*/}cout<<str<<endl;getline(cin,str);            //END}
}