二维数组与稀疏数组的转换

package com.summer.sparseArray;

/**
 * @author ：summer
 * @date ：Created in 2022/8/23 09:12
 * @description：1、二维数组转稀疏数组 2、稀疏数组转二维数组
 */
public class SparseArray {
    public static void main(String[] args) {
        //定义二维数组
        int[][] array = new int[11][11];
        array[0][2] = 6;
        array[1][3] = 2;

        //打印二维数组
        System.out.println("原始二维数组为：");
        for (int[] ints : array) {
            for (int anInt : ints) {
                System.out.printf("%d\t", anInt);
            }
            System.out.println();
        }
        //计算有效的数值个数
        int sum = 0;
        for (int[] ints : array) {
            for (int anInt : ints) {
                if (anInt != 0) {
                    sum++;
                }
            }
        }
        //创建稀疏数组 并复制第一行
        int[][] sparseArray = new int[sum + 1][3];
        sparseArray[0][0] = 11;
        sparseArray[0][1] = 11;
        sparseArray[0][2] = sum;
        //为稀疏数组填充其余数据
        int count = 0;
        for (int i = 0; i < 11; i++) {
            for (int j = 0; j < 11; j++) {
                if (array[i][j] != 0) {
                    count++;
                    sparseArray[count][0] = i;
                    sparseArray[count][1] = j;
                    sparseArray[count][2] = array[i][j];
                }
            }
        }

        System.out.println("稀疏数组为：");

        for (int[] ints : sparseArray) {
            for (int anInt : ints) {
                System.out.printf("%d\t", anInt);
            }
            System.out.println();
        }

        //稀疏数组再转为二维数组
        //为二维数组填充数据
        int[][] array1 = new int[sparseArray[0][0]][sparseArray[0][1]];
        for (int i = 1; i < sparseArray.length; i++) {
            array1[sparseArray[i][0]][sparseArray[i][1]] = sparseArray[i][2];
        }
        //打印二维数组
        System.out.println("转换的二维数组为：");
        for (int[] ints : array1) {
            for (int anInt : ints) {
                System.out.printf("%d\t", anInt);
            }
            System.out.println();
        }

    }
}

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