希爾排序 ShellSort Java代碼

public class ShellSort {
	
	public static void main(String[] args) {
		int[] num = {3,2,1,5,4,2,8,6,12,2};
		shellSort(num);
		for(int i : num){
			System.out.println(i);
		}
	}
	public static void shellSort(int[] data){
		int h = 1;//縮小增量
		while(h<=data.length/3){
			h = h*3+1;
		}
		while(h > 0){
			for(int i = h; i < data.length; i++){
				if(data[i] < data[i - h]){//需要插入
					int temp = data[i];
					int j = i -h;
					for(;j >= 0 && data[j] > temp; j-=h){
						data[j + h] = data[j];//在插入之前，整體後移
					}
					data[j + h] = temp;//插入
				}
			}
			h = (h - 1) / 3;
		}
		
	}
	public static void swap(int[] data, int i, int j){
		int temp = data[i];
		data[i] = data[j];
		data[j] = temp;
	}
}