[游戏开发]稀疏矩阵 sparseArray

稀疏矩阵

// 稀疏矩阵
public class sparseArray {
    public static void main(String[] args) {
        int[][] a = new int[6][7];
        a[1][1] = 1;
        a[2][2] = 2;
        a[3][3] = 3;

        for(int[] row:a){
            for (int data:row) {
                System.out.print(data +" ");
            }
            System.out.println();
        }

        //打印数组
        int sum = 0;
        for(int i = 0;i<a.length;i++){
            for(int j =0 ;j<a[0].length;j++){
             if(a[i][j]!=0){
                 sum++;
             }
            }
        }
        System.out.println("将二维数组转换为稀疏矩阵");
        //将二维数组转换为稀疏矩阵
        int[][] sparseArr = new int[sum+1][3];

        sparseArr[0][0] = a.length;
        sparseArr[0][1] = a[0].length;
        sparseArr[0][2] = sum;

        int num = 1;
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a[0].length; j++) {
                if(a[i][j]!= 0){
                    sparseArr[num][0] = i;
                    sparseArr[num][1] = j;
                    sparseArr[num][2] = a[i][j];
                    num++;
                }
            }
        }

//打印稀疏矩阵
        for(int[] row:sparseArr){
            for (int data:row) {
                System.out.print(data +" ");
            }
            System.out.println();
        }
        System.out.println("将稀疏矩阵转换为二维数组");
//将稀疏矩阵转换为二维数组

    int[][] b = new int[sparseArr[0][0]][sparseArr[0][1]];

        for (int i = 1; i < sparseArr.length; i++) {
            b[sparseArr[i][0]][sparseArr[i][1]] = sparseArr[i][2];

        }

        for(int[] row:b){
            for (int data:row) {
                System.out.print(data +" ");
            }
            System.out.println();
        }
    }
}