快速排序

切分:

public class QuickSort {

    private static int partition(int[] a, int l, int h) {
        int i = l;
        int j = h + 1;
        int k = a[l];
        while (true) {
            while (k > a[++i]) {
                if (i == h) break;
            }
            while (k < a[--j]) {
                if (j == l) break;
            }
            if (i >= j) break;

            int temp = a[i];
            a[i] = a[j];
            a[j] = temp;
        }
        a[l] = a[j];
        a[j] = k;
        return j;
    }


    private static void quickSort(int[] a,int l,int h){
        if(l>= h) return;
        int p = partition(a,l,h);
        quickSort(a,l,p-1);
        quickSort(a,p+1,h);
    }

    public static void main(String[] args){
        int[] a = {3,43,70,97,98,7,545,8,6,78,1,20,98,6,76};
        quickSort(a,0,a.length-1);
        for(int i:a){
            System.out.print(i+", ");
        }
    }

}