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  1. class Main{
  2.     public static void main (String[] args) throws java.lang.Exception
  3.     {
  4.         System.out.println(cifra(3, "INVIO RINFORZI DOMANI"));
  5.         System.out.println(decifra(3, "IIIOIMI\t\nNONRDAVRFZON"));
  6.     }
  7.  
  8.     public static String cifra(int key, String messaggio) {        
  9.         int c = key;
  10.         String output = "";
  11.  
  12.  
  13.  
  14.  
  15.         messaggio = messaggio.replaceAll("\\s", "");
  16.  
  17.  
  18.  
  19.  
  20.         int r = messaggio.length()/c;
  21.         if (messaggio.length()%c != 0){
  22.             r++;
  23.         }
  24.         int pos = 0;
  25.  
  26.         char[][] M = new char [r][c];
  27.             for (int i = 0; i < r; i++) {
  28.                 for (int j = 0; j < c; j++) {
  29.                     if (pos == messaggio.length())
  30.                     break;
  31.                     M[i][j] = messaggio.charAt(pos);
  32.                     pos++;
  33.                 }
  34.             }
  35.  
  36.             for (int i = 0; i < c; i++) {
  37.                 for (int j = 0; j < r; j++) {
  38.                 	if(M[j][i] != 0)
  39.                     	output += M[j][i];
  40.                 }
  41.             }
  42.         return output;
  43.     }
  44.  
  45.     public static String decifra(int key, String messaggio) {        
  46.         int c = key;
  47.         String output = "";
  48.  
  49.  
  50.  
  51.  
  52.         messaggio = messaggio.replaceAll("\\s", "");
  53.  
  54.  
  55.  
  56.  
  57.         int r = messaggio.length()/c;
  58.         int eccesso = messaggio.length()%c;
  59.         if (eccesso != 0){
  60.             r++;
  61.         }
  62.         int pos = 0;
  63.  
  64.         char[][] M = new char [r][c];
  65.             for (int j = 0; j < c; j++) {
  66.                 for (int i = 0; i < r; i++) {
  67.                     if (pos == messaggio.length())
  68.                     	break;
  69.                 	if((eccesso != 0) && (i == r-1) && (j >= eccesso)){
  70.                     	continue;
  71.                 	}
  72.                 	M[i][j] = messaggio.charAt(pos);
  73.                     pos++;
  74.                 }
  75.             }
  76.  
  77.             for (int i = 0; i < r; i++) {
  78.                 for (int j = 0; j < c; j++) {
  79.                 	if(M[i][j]!= 0)
  80.                     	output += M[i][j];
  81.                 }
  82.             }
  83.         return output;
  84.     }
  85. }
Success #stdin #stdout 0.07s 380224KB
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IIIOIMINONRDAVRFZON
INVIORINFORZIDOMANI
https://ideone.com/HwbAjl
language:
Java (12.0.1)
created:
10 years ago
visibility:
secret

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