quickSort

import java.io.*;
import java.util.*;
import java.lang.*;

public class QuickSort {
    public static void bubbleSort(Integer[] arr, int n) {
        for (int i = 0; i < n - 1; i++)
            for (int j = 0; j < n - i - 1; j++)
                if (arr[j] > arr[j + 1]) {
                    swap(arr, j, j+1);
                }
    }

    public static void quickSortDeluxe(Integer[] arr, int p, int r, int c) {
        if (p < r) {
            bubbleSort(arr, c);
            int q = partition(arr, p, r);
            quickSort(arr, p, q);
            quickSort(arr, q + 1, r);
        }
    }

    public static void quickSort(Integer[] arr, int p, int r) {
        if (p < r) {
            int q = partition(arr, p, r);
            quickSort(arr, p, q);
            quickSort(arr, q + 1, r);
        }
    }

    public static int partition(Integer[] arr, int p, int r) {
        int x = arr[r];
        int i = p - 1;
        for (int j = 0; j < r; j++) {
            if (arr[j] < x) {
                i++;
                swap(arr, i, j);
            }
        }
        if (i < r)
            return i;
        else
            return i - 1;
    }

    public static void swap(Integer[] arr, int a, int b) {
        int temp;
        temp = arr[a];
        arr[a] = arr[b];
        arr[b] = temp;
    }

    public static void main(String[] args) {
        int[] size = {100, 500, 1000, 5000};
        long[][] res = new long[4][4];
        long begin, end;
        Random r = new Random();

        for (int i = 0; i < size.length; i++) {
            Integer[] arr = new Integer[size[i]];
            int c = r.nextInt(size[i]);
            Arrays.fill(arr, new Random().nextInt());
            Integer dup[] = arr;
            Integer dupDesc[] = arr;
            Integer dupDesc2[] = arr;
            Arrays.sort(dupDesc, Collections.reverseOrder());
            Arrays.sort(dupDesc2, Collections.reverseOrder());

            begin = System.nanoTime();
            quickSort(arr, 0, size[i]-1);
            end = System.nanoTime();
            res[0][i] = (end - begin);

            begin = System.nanoTime();
            quickSortDeluxe(dup, 0, size[i]-1, c);
            end = System.nanoTime();
            res[1][i] = (end - begin);

            begin = System.nanoTime();
            quickSort(dupDesc, 0, size[i]-1);
            end = System.nanoTime();
            res[2][i] = (end - begin);

            begin = System.nanoTime();
            quickSortDeluxe(dupDesc2, 0, size[i]-1, c);
            end = System.nanoTime();
            res[3][i] = (end - begin);
        }
        System.out.println("Wyniki działania programu:");
        System.out.println();
        System.out.println("Rozmiar tablicy n=100:\nDane korzystne|QuickSort: "+res[0][0]+"\nDane korzystne|QuickSort+: "+res[1][0]+"\nDane niekorzystne|QuickSort: "+res[2][0]+"\nDane niekorzystne|QuickSort+: "+res[3][0]);
        System.out.println();
        System.out.println("Rozmiar tablicy n=500:\nDane korzystne|QuickSort: "+res[0][1]+"\nDane korzystne|QuickSort+: "+res[1][1]+"\nDane niekorzystne|QuickSort: "+res[2][1]+"\nDane niekorzystne|QuickSort+: "+res[3][1]);
        System.out.println();
        System.out.println("Rozmiar tablicy n=1000:\nDane korzystne|QuickSort: "+res[0][2]+"\nDane korzystne|QuickSort+: "+res[1][2]+"\nDane niekorzystne|QuickSort: "+res[2][2]+"\nDane niekorzystne|QuickSort+: "+res[3][2]);
        System.out.println();
        System.out.println("Rozmiar tablicy n=5000:\nDane korzystne|QuickSort: "+res[0][3]+"\nDane korzystne|QuickSort+: "+res[1][3]+"\nDane niekorzystne|QuickSort: "+res[2][3]+"\nDane niekorzystne|QuickSort+: "+res[3][3]);
    }
}