希尔排序

Posted 2020-06-23 ssdut_yrp

public class ArraySh {
    private long[] theArray;
    private int nElems;

    public ArraySh(int max){
        theArray=new long[max];
        nElems=0;
    }

    public void insert(long value){
        theArray[nElems]=value;
        nElems++;
    }

    public void display(){
        System.out.print("A=");
        for(int j=0;j<nElems;j++)
            System.out.print(theArray[j]+" ");
        System.out.println("");
    }

    public void shellSort(){
        int inner,outer;
        long temp;
        int h=1;
        while(h<=nElems/3){//find initial value of h
            h=h*3+1;//1 4 13 40 121
        }
        while(h>0){//decreasing h ,until h=1
            for(outer=h;outer<nElems;outer++){
                temp=theArray[outer];
                inner=outer;
                while(inner>h-1&&theArray[inner-h]>=temp){
                    theArray[inner]=theArray[inner-h];
                    inner-=h;
                }
                theArray[inner]=temp;
            }
            h=(h-1)/3;
        }
    }
}

public class ShellSortApp {
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int maxSize=10;
        ArraySh arr;
        arr =new ArraySh(maxSize);
        for(int j=0;j<maxSize;j++){
            long n=(int) (Math.random()*99);
            arr.insert(n);
        }
        arr.display();
        arr.shellSort();
        arr.display();
    }
}