改为如下就AC了O(∩_∩)O~
#include<iostream>
#include<string>
using namespace std;
int main()
{	
	 int i,j;
	 char b[100];
	 char a[100]={'/', '.', ',', 'M', 'N', 'B', 'V', 'C', 'X','Z','\'', ';', 'L', 'K', 'J', 'H', 'G', 'F', 'D','S','A','\\', 
	            	']', '[', 'P', 'O', 'I', 'U', 'Y', 'T', 'R', 'E', 'W', 'Q','=', '-','0', '9', '8', '7', '6', '5', '4', '3','2','1','`'};       
	 while(gets(b))
	 {	 
		for(i=0;i<strlen(b);i++)
		     if(b[i]=='Z'||b[i]=='A'||b[i]=='Q'||b[i]=='`')
				continue;
			 else
			 {	
		         if(b[i]!=' ')
				 {
			          for(j=0;j<50;j++)
					  {
				            if(b[i]==a[j])
				    	         break;
					  }
			          cout<<a[j+1];
				 }
		         else 
		   	          cout<<b[i];
			 }
	    cout<<endl;
	}
	return 0;
}