public class BubbleSort {

    public static void mainB(int n) {
        int[] list = new int[n];
        for (int i = 0; i < n; i++) {
            list[i] = Utils.makeRandom(n*10);
        }
        printList(list);
        bubbleSort(list);
        System.out.println();
        printList(list);
    }


    public static void mainT(int n) {
        int[] list = new int[n];
        for (int i = 0; i < n; i++) {
            list[i] = Utils.makeRandom(n * 10);
        }
        long st = System.nanoTime();
        bubbleSort(list);
        long fn = System.nanoTime();
        System.out.println(fn-st);
    }


    public static void main(String[] args) {
        int l = Integer.parseInt(args[0]);
        mainT(l);
    }

    public static void printList(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            System.out.println(i + "  " + arr[i]);
        }
    }

    public static void bubbleSort(int[] arr) {
        for (int i = 0; i < arr.length; i++) {
            for (int j = 1; j < (arr.length-i); j++) {
                if (arr[j-1] < arr[j]) {
                    int temp = arr[j-1];
                    arr[j-1] = arr[j];
                    arr[j] = temp;
                }
            }
        }
    }
}