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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.concurrent.ThreadLocalRandom;
  4.  
  5. /* Name of the class has to be "Main" only if the class is public. */
  6. class Ideone
  7. {
  8. 	static char board[][];
  9. 	static boolean tryPlaceWithBorder(int x,int y,int width,int height) {
  10.       for(int i=0;i<height;i++)
  11.         for(int j=0;j<width;j++)
  12.           if(board[y+i][x+j]!='.')
  13.             return false; // ship can not be placed
  14.       // if we reach here, ship can be placed
  15.       for(int i=1;i<height-1;i++)
  16.         for(int j=1;j<width-1;j++)
  17.           board[y+i][x+j]='#';
  18.       return true; // ship placed successfully
  19.     }
  20.  
  21. 	public static void main (String[] args) throws java.lang.Exception
  22. 	{
  23. 	  ThreadLocalRandom random=ThreadLocalRandom.current();
  24.       board=new char[12][12];
  25.       for(int i=0;i<12;i++)
  26.         for(int j=0;j<12;j++)
  27.           board[i][j]='.';
  28.  
  29.       int size=3;
  30.       int amount=2;
  31.       while(amount>0) {
  32.         if(random.nextBoolean()) {
  33.           // horizontal
  34.           if(tryPlaceWithBorder(random.nextInt(12-size-1),random.nextInt(10),size+2,3))
  35.             amount--; // one placed
  36.         } else {
  37.           // vertical
  38.           if(tryPlaceWithBorder(random.nextInt(10),random.nextInt(12-size-1),3,size+2)){
  39.             amount--; // one placed
  40.           }
  41.         }
  42.       }
  43.  
  44.       // and a 4x2 mothership
  45.       while(!(random.nextBoolean()
  46.         ?tryPlaceWithBorder(random.nextInt(7),random.nextInt(9),6,4)
  47.         :tryPlaceWithBorder(random.nextInt(9),random.nextInt(7),4,6)
  48.       ));
  49.  
  50.       for(int i=1;i<11;i++)
  51.         System.out.println(String.valueOf(board[i],1,10));
  52.     }
  53. }
  54.  
Success #stdin #stdout 0.1s 32620KB
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Standard input is empty
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..........
..........
..........
..####....
..####.###
..........
..........
.###......
..........
..........
https://ideone.com/LXAD7T
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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