稀疏数组

package com.jiangdi.sparsearray;

public class SparseArray {
    //创建二维数组11*11
    //0：没有数组，1 表示黑子 2 表示白子
    public static void main(String[] args) {
        int chessArr1[][] = new int[11][11];
        chessArr1[1][2] = 1;
        chessArr1[2][3] = 2;
        //输出原始二维数组
        for (int[] ints : chessArr1) {
            for (int anInt : ints) {
                System.out.printf("%d\t",anInt);
            }
            System.out.println();
        }
        /*
         * 将二维数组 转 稀疏数组
         * 1、先遍历二维数组 得到非0数据的个数*/
        int sum = 0;
        for (int i = 0; i <chessArr1.length ; i++) {
            for (int j = 0; j < chessArr1.length; j++) {
                if (chessArr1[i][j]!=0){
                    sum++;
                }

            }

        }
        System.out.println("sum="+sum);
        /*2.创建对应的稀疏数组*/

        int sparseArr[][] = new int[sum+1][3];
        //给稀疏数组赋值
        sparseArr[0][0] =11;
        sparseArr[0][1] =11;
        sparseArr[0][2] =sum;
        //遍历二维数组，将非0的值存放到 sparseArr中
        int count = 0;
        for (int i = 0; i <11 ; i++) {
            for (int j = 0; j < 11; j++) {
                if (chessArr1[i][j]!=0){
                    count++;
                    sparseArr[count][0] = i;
                    sparseArr[count][1] = j;
                    sparseArr[count][2] = chessArr1[i][j];
                }

            }

        }
        //输出稀疏数组
        System.out.println();
        System.out.println("得到稀疏数组为：");
        for (int i = 0; i < sparseArr.length; i++) {
            System.out.printf("%d\t%d\t%d\t\n",sparseArr[i][0],sparseArr[i][1],sparseArr[i][2]);

        }
        System.out.println();
        /*将稀疏数组恢复成二位数组*/
        int chessArr2[][] = new int[sparseArr[0][0]][sparseArr[0][1]];
        //读取稀疏数组数据
        for(int i=1; i<sparseArr.length;i++){
            chessArr2[sparseArr[i][0]][sparseArr[i][1]]=sparseArr[i][2];
        }


        System.out.println();
        for (int[] ints : chessArr2) {
            for (int anInt : ints) {
                System.out.printf("%d\t",anInt);
            }
            System.out.println();
        }



    }
}