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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 tryPlace(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.           }
  15.         }
  16.       }
  17.       // if we reach here, ship can be placed
  18.       for(int i=0;i<height;i++) {
  19.         for(int j=0;j<width;j++) {
  20.           board[y+i][x+j]='#';
  21.         }
  22.       }
  23.       return true; // ship placed successfully
  24.     }
  25.  
  26. 	public static void main (String[] args) throws java.lang.Exception
  27. 	{
  28. 	  ThreadLocalRandom random=ThreadLocalRandom.current();
  29.       board=new char[10][10];
  30.       for(int i=0;i<10;i++)
  31.         for(int j=0;j<10;j++)
  32.           board[i][j]='.';
  33.  
  34.       int size=3;
  35.       int amount=2;
  36.       while(amount>0) {
  37.         if(random.nextBoolean()) {
  38.           // horizontal
  39.           if(tryPlace(random.nextInt(10-size+1),random.nextInt(10),size,1)){
  40.             amount--; // one placed
  41.           }
  42.         } else {
  43.           // vertical
  44.           if(tryPlace(random.nextInt(10),random.nextInt(10-size+1),1,size)){
  45.             amount--; // one placed
  46.           }
  47.         }
  48.       }
  49.  
  50.       // and a 4x2 mothership
  51.       while(!(random.nextBoolean()
  52.         ?tryPlace(random.nextInt(7),random.nextInt(9),4,2)
  53.         :tryPlace(random.nextInt(9),random.nextInt(7),2,4)
  54.       ));
  55.  
  56.       for(int i=0;i<10;i++)
  57.         System.out.println(board[i]); // char[] has special overload for print/ln()
  58.     }
  59. }
  60.  
Success #stdin #stdout 0.06s 32468KB
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stdin
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Standard input is empty
stdout
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.....###..
..........
..........
......#...
......#...
......#...
........##
........##
........##
........##
https://ideone.com/DjYqjB
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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