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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		int rows = 3;
  14. 		int columns = 3;
  15. 		ArrayList<ArrayList<Integer>> matrix = 
  16. 			new ArrayList<ArrayList<Integer>>();
  17. 		for (int i=0; i<rows; i++) {
  18. 			matrix.add(new ArrayList<Integer>());
  19. 			for (int j=0; j<columns; j++) {
  20. 				matrix.get(i).add((j+1)+(columns*i));
  21. 			}
  22. 		}
  23. 		for (int i=0; i<rows; i++) {
  24. 			for (int j=0; j<columns; j++) {
  25. 				System.out.print(matrix.get(i).get(j) + " ");
  26. 			}
  27. 			System.out.println("");
  28. 		}
  29. 		printMatrixLine(0,0, rows, columns, "col", "increment", matrix);
  30. 	}
  31.  
  32. 	public static void printMatrixLine(int startRow, int startCol, int rows, 
  33. 		int columns, String parameterToChange, String direction,
  34. 		ArrayList<ArrayList<Integer>> matrix) {
  35.  
  36. 			int traverser;
  37. 			int multiplier;
  38. 			String whichDirection;
  39. 			boolean visited = false;
  40.  
  41. 			if (direction == "increment") {
  42. 				multiplier = 1;
  43. 			}
  44. 			else {
  45. 				multiplier = -1;
  46. 			}
  47.  
  48. 			if (parameterToChange == "row") {
  49. 				traverser=startRow;
  50. 				System.out.printf("trav: %d, visited %b", traverser, visited);
  51. 				while ( (traverser >= 0) && (traverser<rows) && !visited ) {
  52. 					if (matrix.get(traverser).get(startCol) != -1) {
  53. 						System.out.print(matrix.get(traverser).get(startCol));
  54. 						matrix.get(traverser).set(startCol, -1);
  55. 						traverser = traverser + 1*multiplier;						
  56. 					}
  57. 					else {
  58. 						visited = true;
  59. 					}
  60. 				}
  61. 				System.out.printf("trav: %d, visited %b", traverser, visited);
  62. 				if (direction == "increment") {
  63. 					whichDirection = "decrement";
  64. 				}
  65. 				else {
  66. 					whichDirection = "increment";
  67. 				}
  68. 				printMatrixLine(traverser-1*multiplier, startCol, rows, 
  69. 				columns, "col", whichDirection, matrix);
  70. 			}
  71. 			else {
  72. 				traverser=startCol;
  73. 				while ( (traverser>=0) && (traverser<columns) ) {
  74. 					if (matrix.get(startRow).get(traverser) != -1) {
  75. 						System.out.print(matrix.get(startRow).get(traverser));
  76. 						matrix.get(startRow).set(traverser, -1); //mark visited
  77. 						traverser = traverser + 1*multiplier;
  78. 					}
  79. 				}
  80. 			}			
  81.  
  82. 		}
  83.  
  84. }
Success #stdin #stdout 0.04s 4386816KB
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https://ideone.com/ywi575
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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