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：黑旗   2：白旗
    int[][] array1 = new int [11] [11];
    array1[1][2] = 1;
    array1[2][3] = 1;
    //输出原始的数组
    System.out.print("输出原始的数组");

    for (int[] ints : array1){
        for (int anInt : ints){
            System.out.println(anInt+"\t");
        }
        System.out.println();
    }
    System.out.println("=======================");
    //转换为稀疏数组保存
    //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);

    //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;
    
    //便利二维数组，将非零的值，存放稀疏数组中
    int count=0;
    for (int i = 0; i < array1.length; i++) {
        for (int j = 0; j < array1[i].length; j++) {
            if (array1[i][j]!=0){
                count++;
                array2[count][0] = j;
                array2[count][1] = j;
                array2[count][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.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];
    }
    //3.打印
    System.out.println("输出还原的数组");
    for (int[] ints : array3){
        for (int anInt : ints){
            System.out.print(anInt+"\t");
        }
        System.out.println();
    }