回形取数

 1 import java.util.Scanner;
 2 
 3 public class Main {
 4     public static void main(String args[]){
 5         Scanner sc = new Scanner(System.in);
 6         int m = sc.nextInt();
 7         int n = sc.nextInt();
 8         int[][] array = new int[m][n];
 9         for(int i=0;i<m;i++){
10             for(int j=0;j<n;j++){
11                 array[i][j] = sc.nextInt();
12             }
13         }
14         
15         int tot = 0,x=-1,y=0;
16         while(tot<m*n){
17             while(x+1 < m && array[x+1][y]!=-1){
18                 System.out.print(array[++x][y]+" ");
19                 array[x][y] = -1;
20                 ++tot;
21             }
22             while(y+1 < n && array[x][y+1] != -1){
23                 System.out.print(array[x][++y]+" ");
24                 array[x][y] = -1;
25                 ++tot;
26             }
27             while(x-1>=0 && array[x-1][y]!=-1){
28                 System.out.print(array[--x][y]+" ");
29                 array[x][y] = -1;
30                 ++tot;
31             }
32             while(y-1>=0 && array[x][y-1]!=-1){
33                 System.out.print(array[x][--y]+" ");
34                 array[x][y] = -1;
35                 ++tot;
36             }
37         }
38     }
39 
40 }