NYOJ题目769乘数密码

 1 import java.io.BufferedReader;
 2 import java.io.IOException;
 3 import java.io.InputStreamReader;
 4 
 5 public class Main {
 6 
 7     public static void main(String[] args) throws IOException {
 8         
 9         BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));;
10         
11         boolean first=true;
12         
13         while(first || reader.ready()){
14             first=false;
15             
16             String s=reader.readLine();
17             String ss[]=s.split("\\s{1,}");
18             initMapping(Integer.parseInt(ss[1]));
19             System.out.println(encoding(ss[0]));
20         }
21     }
22     
23     private static int[] mapping=new int[26];
24     
25     public static void initMapping(int k){
26         for(int i=0;i<mapping.length;i++){
27             mapping[k*i%26]=i;
28         }
29     }
30     
31     public static char[] encoding(String s){
32         char cs[]=s.toCharArray();
33         for(int i=0;i<cs.length;i++){
34             cs[i]=(char) (mapping[cs[i]-‘A‘]+‘A‘);
35         }
36         return cs;
37     }
38     
39 }