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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 quicksort(int[] array, int start, int end) {
  11. 	if ((end-start) < 2) { return; }
  12. 		for (int i = 0; i < array.length; i++) {
  13. 			System.out.print(array[i] + " ");
  14. 		}
  15. 		System.out.println();
  16. 		int pIndex = partition(array, start, end);
  17. 		quicksort(array, start, pIndex - 1);
  18. 		quicksort(array, pIndex + 1, end);
  19.  
  20. }
  21.  
  22. public static int partition(int[] array, int start, int end) {
  23. 	int pivot = array[end];
  24. 	int pIndex = start;
  25. 	System.out.println("pivot: " + pivot);
  26. 	System.out.println("array[pIndex]: " + array[pIndex]);
  27. 	for (int i = start; i <= end - 1; i++) {
  28. 		if (array[i] <= pivot) {
  29. 			int tmp = array[pIndex];  // swap values
  30. 			array[pIndex] = array[i];
  31. 			array[i] = tmp;
  32. 			pIndex++;
  33. 		}
  34. 	}
  35. 	int tmpVal = array[pIndex];
  36. 	array[pIndex] = pivot;
  37. 	array[end] = tmpVal;
  38. 	return pIndex;
  39. }
  40.  
  41. 	public static void main (String[] args) throws java.lang.Exception
  42. 	{
  43. 		// your code goes here
  44. 		int[] array = {7, 5, 3, 6, 8, 1, 2, 4};
  45. 		quicksort(array, 0, array.length - 1);
  46. 		for (int i = 0; i < array.length; i++) {
  47. 			System.out.print(array[i] + " ");
  48. 		}
  49. 	}
  50. }
Success #stdin #stdout 0.09s 320576KB
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stdin
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Standard input is empty
stdout
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7 5 3 6 8 1 2 4 
pivot: 4
array[pIndex]: 7
3 1 2 4 8 5 7 6 
pivot: 2
array[pIndex]: 3
1 2 3 4 8 5 7 6 
pivot: 6
array[pIndex]: 8
1 2 3 4 5 6 7 8
https://ideone.com/wY23C6
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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