将二维数组中的有效值转换成稀疏数组存储

将二维数组中的有效值转换成稀疏数组存储

//二维数组
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	1	0	0	0	0	0	0	0	0	
0	0	0	2	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
0	0	0	0	0	0	0	0	0	0	0	
==================================
//稀疏数组
行	列	值
11	11	2
4	2	1
5	3	2

代码如下：

public class XiShuArray {

    public static void main(String[] args) {
        int[][] array1 = new int[11][11];
        array1[4][2] = 1;
        array1[5][3] = 2;

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

        //将二维数组中的有效值转换成稀疏数组存储
        //获取有效值个数
        int sum = 0;
        for (int i = 0; i < array1.length; i++) {
            for (int j = 0; j < array1[i].length; j++) {
                if(array1[i][j] != 0 ){
                    sum++;
                }
            }
        }

        System.out.println("==================================");
        //创建稀疏数组
        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0的值，存入稀疏数组
        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] = i;
                    array2[count][1] = j;
                    array2[count][2] = array1[i][j];
                }
            }
        }


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

        //将稀疏数组还原成二维数组
        int[][] array3 = new int[array2[0][0]][array2[0][1]];

        //读取稀疏数组的值，赋给二维数组
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }

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


    }
}

原文：https://www.cnblogs.com/fengyishui/p/14673768.html