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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. 	static int[][] convertToDiagonal(int[][] input) {
  11.  
  12. 		int[][] output = new int[input.length][input.length];
  13. 		int i = 0, j = 0;
  14.  
  15. 		int n = input.length;
  16. 		for (int slice = 0; slice < 2 * n - 1; slice++) {
  17. 			int z = slice < n ? 0 : slice - n + 1;
  18. 			for (int k = z; k <= slice - z; ++k) {
  19. 				output[i][j++] = input[k][slice - k];
  20. 			}
  21. 			if(j == n) {
  22. 				j = 0;
  23. 				i++;
  24. 			}
  25. 		}
  26. 		return output;
  27. 	}
  28.  
  29. 	static void print(int[][] data) {
  30. 		for(int i = 0; i < data.length; i++) {
  31. 			System.out.print("| ");
  32. 			for(int j = 0; j < data[0].length; j++) {
  33. 				System.out.print(data[i][j] + " ");
  34. 			}
  35. 			System.out.println("|");
  36. 		}
  37. 		System.out.println();
  38. 	} 
  39.  
  40. 	static void test() {
  41. 		int[][] data = new int[3][3];
  42. 		data[0] = new int[] { 1, 2, 3 };
  43. 		data[1] = new int[] { 4, 5, 6 };
  44. 		data[2] = new int[] { 7, 8, 9 };
  45.  
  46. 		System.out.println("Input:");
  47. 		print(data);
  48.  
  49. 		data = convertToDiagonal(data);
  50.  
  51. 		System.out.println("Output:");
  52. 		print(data);
  53. 	}
  54.  
  55. 	public static void main(String[] args) {
  56. 		test();
  57. 	}
  58. }
Success #stdin #stdout 0.08s 380224KB
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stdin
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Standard input is empty
stdout
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Input:
| 1 2 3 |
| 4 5 6 |
| 7 8 9 |

Output:
| 1 2 4 |
| 3 5 7 |
| 6 8 9 |
https://ideone.com/fDIflO
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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