2023.7.20 周四：稀疏数组

import java.sql.SQLOutput;
import java.util.Arrays;
import java.util.Scanner;
//稀疏数组
public class test {
    public static void main(String[] args) {
        //首先创建一个11*11的二维数组  0：没有棋子  1：白棋  2：黑棋
        int[][] array1 = new int[11][11];
        array1[1][2] = 1;
        array1[2][3] = 2;
        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();
        }
        System.out.println("==========================================");
        //转换为稀疏数组保存
        int sum = 0;//获取有效值的个数
        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);
        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，将不是零的值，赋给稀疏数组
        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];
                }
            }
        }
        System.out.println("输出稀疏数组");
        for (int i = 0; i < array2.length; i++) {
           System.out.println(array2[i][0]+"\t"
                   +array2[i][1]+"\t"
                   +array2[i][2]);
        }
        System.out.println("=============================");
        System.out.println("还原");
        int[][] array3 = new int[array2[0][0]][array2[0][1]];
        for (int i = 1; i < array2.length; i++) {
            array3[array2[i][0]][array2[i][1]] = array2[i][2];
        }
        for (int[] ints : array3) {
            for (int anInt : ints) {
                System.out.print(anInt+"\t ");
            }
            System.out.println();
        }
    }
}