稀疏数组

package zaiyang.array;

public class ArrayDemo09 {
    public static void main(String[] args) {
        //1.创建一个二维数组 11*11   0：没有棋子，  1：黑棋    2： 百棋
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        //输出原始的数组
        System.out.println("输出原始的数组");

        for (int[] ints : array1) {
            for (int anInt :ints){
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }

        //转换为稀疏数组保存
        //1.获取有效值的个数
        int sum = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (array1[i][j] !=0){
                    sum++;
                }
            }
        }
        System.out.println("有效值的个数"+sum);

        //2.创建一个稀疏数组
        int[][] array2 = new int[sum+1][3];

        array2[0][0] = 11;
        array2[0][1] = 11;
        array2[0][2] = sum;

        //遍历二维数组，将非零的值，存放稀疏数组中
        int cont = 0;
        for (int i = 0; i < array1.length; i++) {
            for (int j = 0; j < array1[i].length; j++) {
                if (array1[i][j] !=0){
                    cont++;
                    array2[cont][0] =i;
                    array2[cont][1] =j;
                    array2[cont][2] =array1[i][j];

                }
            }
        }
        //输出稀疏数组
        System.out.println("稀疏数组");
        for (int i = 0; i < array2.length; i++) {
            System.out.println(array2[i][0]+"\t"
                          +array2[i][1]+"\t"
                          +array2[i][2]+"\t");
        }

        System.out.println("=======================================================");
        System.out.println("还原");
        //1.读取稀疏数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];
        //2.还原其中元素的值
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }

        //3.打印
        System.out.println("输出还原的数组");
        for (int[] ints : array1){
            for (int anInt : ints){
                System.out.print(anInt+"\t");
            }
            System.out.println();
        }



    }
}