九度——题目1001：A+B for Matrices

题目描述：

    This time, you are supposed to find A+B where A and B are two matrices, and then count the number of zero rows and columns.

输入：

    The input consists of several test cases, each starts with a pair of positive integers M and N (≤10) which are the number of rows and columns of the matrices, respectively. Then 2*M lines follow, each contains N integers in [-100, 100], separated by a space. The first M lines correspond to the elements of A and the second M lines to that of B.

    The input is terminated by a zero M and that case must NOT be processed.

输出：

    For each test case you should output in one line the total number of zero rows and columns of A+B.

样例输入：

2 2
1 1
1 1
-1 -1
10 9
2 3
1 2 3
4 5 6
-1 -2 -3
-4 -5 -6
0

样例输出：

1
5

来源：

2011年浙江大学计算机及软件工程研究生机试真题

import java.util.Scanner;
 
public class Main
{
    /**
     * @param args
     */
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);
        int a1[][], a2[][], rows, columns, count;
        boolean isZero;
        while (cin.hasNext())
        {
            count = 0;
            rows = cin.nextInt();
            if (rows == 0)
            {
                return;
            }
            columns = cin.nextInt();
            // 开辟空间
            a1 = new int[rows][];
            for (int i = 0; i < rows; i++)
            {
                a1[i] = new int[columns];
            }
            a2 = new int[rows][];
            for (int i = 0; i < rows; i++)
            {
                a2[i] = new int[columns];
            }
            // 输入数组
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    a1[i][j] = cin.nextInt();
                }
            }
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    a2[i][j] = cin.nextInt();
                }
            }
            // 求和
            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < columns; j++)
                {
                    a1[i][j] = a1[i][j] + a2[i][j];
                }
            }
            // 统计空行
            for (int i = 0; i < rows; i++)
            {
                isZero = true;
                for (int j = 0; j < columns; j++)
                {
                    if (a1[i][j] != 0)
                    {
                        isZero = false;
                    }
                }
                if (isZero)
                {
                    count++;
                }
            }
            // 统计空列
            for (int j = 0; j < columns; j++)
            {
                isZero = true;
                for (int i = 0; i < rows; i++)
                {
                    if (a1[i][j] != 0)
                    {
                        isZero = false;
                    }
                }
                if (isZero)
                {
                    count++;
                }
            }
            System.out.println(count);
        }
    }
}
 
/**************************************************************
    Problem: 1001
    User: 忆、瞻
    Language: Java
    Result: Accepted
    Time:1730 ms
    Memory:17992 kb
****************************************************************/