// Author: Rodney Shaghoulian // Github: github.com/RodneyShag // HackerRank: hackerrank.com/RodneyShag import java.util.Scanner; public class Solution { public static void main(String[] args) { Scanner scan = new Scanner(System.in); int s = scan.nextInt(); int[] array = new int[s]; for (int i = 0; i < s; i++) { array[i] = scan.nextInt(); } scan.close(); quickSort(array); } public static void quickSort(int [] array) { if (array != null) { quickSort(array, 0, array.length - 1); } } private static void quickSort(int [] array, int start, int end) { if (start < end) { int pivotIndex = partition(array, start, end); printArray(array, 0, array.length - 1); quickSort(array, start, pivotIndex - 1); quickSort(array, pivotIndex + 1, end); } } /* Must use "Lomuto Partition" scheme (which isn't very efficient) from Wikipedia: https://en.wikipedia.org/wiki/Quicksort#Lomuto_partition_scheme */ private static int partition(int[] A, int lo, int hi) { int pivot = A[hi]; int i = lo - 1; for (int j = lo; j <= hi - 1; j++) { if (A[j] <= pivot) { i++; swap(A, i , j); } } swap(A, i + 1, hi); return i + 1; } private static void swap(int [] array, int i, int j) { int temp = array[i]; array[i] = array[j]; array[j] = temp; } private static void printArray(int[] array, int start, int end) { for (int i = start; i <= end; i++) { System.out.print(array[i] + " "); } System.out.println(); } }