package macor.matrix;
import java.util.*;


public class NMMatrix {
    int n;
    int m;

    public NMMatrix(int n, int m){
        this.n = n;
        this.m = m;
    }

    public void generateArray(int n,int m){
        int i = 0;  //行
        int j = 0;	//列
        int k = 1;  //運動方向. k =1 表示運動方向為從左往右移動;k=2 表示從右上角往左下角移動； k=3 表示向下移動 ；k=4 表示從左下角網右上角移動
        int [][] data =new int [n][m];
        data[0][0] = 1;
        while( i!=n-1 || j !=m-1){
           // System.out.println("i="+i+" j="+j+" d="+data[i][j]+ " k="+k);
            if(k == 1){
                data[i][j+1] = data[i][j] + 1;
                j = j + 1;
                if(i == n-1){
                    k = 4;
                }else{
                    k = 2;
                }
            }else if(k == 2){
                data[i+1][j-1] = data[i][j] + 1;
                j = j - 1;
                i = i +1;
                if( j == 0 && i != n-1){
                    k = 3;
                }else if( i == n-1){
                    k = 1;
                }else{
                    k = 2;
                }
            }else if(k == 3){
                data[i+1][j] = data[i][j] + 1;
                i = i+1;
                if( j ==  m-1){
                    k = 2;
                }else {
                    k = 4;
                }
            }else if(k == 4){
                data[i-1][j+1] = data[i][j] + 1;
                j = j + 1;
                i = i - 1;

                if(i == 0 && j != m-1){
                    k = 1;
                }else if( j == m-1  )
                {
                    k = 3;
                }else{
                    k = 4;
                }
            }
        }
        //System.out.println("Finished");
        //System.out.println("i="+i+" j="+j+" d="+data[i][j]+ " k="+k);

        System.out.println("生成的矩陣如下:");

        //顯示矩陣
        for(int a=0;a<n;a++){
            for(int b=0;b<m;b++){
                System.out.print(data[a][b]+"\t");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        System.out.println("請輸入矩陣的行數：");
        int n = in.nextInt();
        System.out.println("請輸入矩陣的列數：");
        int m = in.nextInt();
        NMMatrix mt = new NMMatrix(n,m);
        mt.generateArray(n, m);
    }

}