Poj Solution 3752

http://poj.org/problem?id=3752

import java.io.BufferedInputStream;   
import java.util.Scanner;   
  
/**  
 *  
 *poj3752  
 * ģ��  
 * @author NC  
 */  
public class Main {   
  
    public static void main(String[] args) {   
        Scanner scan = new Scanner(new BufferedInputStream(System.in));   
        if (scan.hasNext()) {   
            int m = scan.nextInt();   
            int n = scan.nextInt();   
            int num = m * n;   
            int[][] letter = new int[m][n];   
            for (int i = 0; i < letter.length; i++) {   
                for (int j = 0; j < letter[i].length; j++) {   
                    letter[i][j] = -1;   
                }   
            }   
            int i = 0, j = 0;   
            int count = 0;   
            if (m != 1 && n != 1) {   
                while (true) {   
                    if (letter[i][j] != -1) {   
                        break;   
                    }   
                    for (int k = 0; k < n; k++) {   
                        letter[i][j + k] = count;   
                        count++;   
                    }   
                    j = j + n - 1;   
                    if (m != 1) {   
                        for (int k = 1; k < m - 1; k++) {   
                            letter[i + k][j] = count;   
                            count++;   
                        }   
                        i = i + m - 1;   
  
                        for (int k = 0, c = 0; c < n; k--, c++) {   
                            letter[i][j + k] = count;   
                            count++;   
                        }   
                        j = j - n + 1;   
                        for (int k = -1, c = 1; c < m - 1; c++, k--) {   
                            letter[i + k][j] = count;   
                            count++;   
                        }   
                        i = i - m + 2;//���ﲻһ��   
                    }   
                    j = j + 1;   
                    m = m - 2;   
                    n = n - 2;   
                }   
            } else if (m == 1 && n == 1) {   
                letter[0][0] = 0;   
            } else if (m == 1) {   
                for (int k = 0; k < n; k++) {   
                    letter[0][k] = k;   
                }   
            } else {   
                for (int k = 0; k < m; k++) {   
                    letter[k][0] = k;   
                }   
            }   
            for (int k = 0; k < letter.length; k++) {   
                for (int v = 0; v < letter[k].length; v++) {   
                    char ch = (char) (letter[k][v] % 26 + 'A');   
                    System.out.print("   " + ch);   
                }   
                System.out.println();   
            }   
        }   
  
    }   
}