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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. 		p(8);
  12. 		p(9);
  13. 	}
  14.  
  15. 	private static void p(int n) {
  16. 		System.out.println("Input: " + n);
  17. 		System.out.print("Output:");
  18. 		var start = (int) Math.ceil(n/2.0);
  19. 		var even = (n & 1) == 0;
  20. 		tailrec(start, even, start, -1);
  21. 		System.out.println();
  22. 	}
  23.  
  24. 	private static void tailrec(int start, boolean even, int current, int step) {
  25. 		if (current > start) {
  26. 			return;
  27. 		}
  28. 		System.out.print(" " + current);
  29. 		if (current > 1) {
  30. 			tailrec(start, even, current+step, step);
  31. 		} else {
  32. 			if (even) { System.out.print(" " + current); }
  33. 			tailrec(start, even, current+1, 1);
  34. 		}
  35. 	}
  36. }
Success #stdin #stdout 0.09s 48276KB
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stdin
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Standard input is empty
stdout
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Input: 8
Output: 4 3 2 1 1 2 3 4
Input: 9
Output: 5 4 3 2 1 2 3 4 5
https://ideone.com/3L8K9C
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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