稀疏数组

稀疏数组

 //稀疏数组
    public static void main(String[] args) {
        //1创建一个二维数组11*11   0没有旗子，1黑棋，2白棋
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;

        //输出原始数组
        System.out.println("原始数组");

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

        //转换成稀疏数组
        //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. 创建一个稀疏数组的数组
        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 count = 0;
        //遍历多少行
        for (int i = 0; i < array1.length; i++) {
            //遍历每行多少次
            for (int j = 0; j < array1[i].length; j++) {
                if (array1[i][j] != 0) {
                    count++;
                    array2[count][0] = i;
                    array2[count][1] = j;
                    array2[count][2] = array1[i][j];

                }
            }
        }
        //输出稀疏数组
        //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.给其中的元素还原它的值
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }


        System.out.println("还原数组");

        for (int[] ints : array3) {
            for (int anInt : ints) {
                System.out.print(anInt + "\t");
            }
            System.out.println();

        }
    }