ZOJ 1949Error Correction

第一次用Linux下面寫acm的代碼，vi + g++。

#include <iostream>
#include <memory.h>
//#define DEBUG
using namespace std;

bool mat[100][100];
int main(int argc, char *argv[])
{
        int mat_size, column_count[100], row_count[100], col_odd_cnt, row_odd_cnt, change_bit[2];
        while (cin >> mat_size && mat_size > NULL)
        {
                memset(column_count, 0x00, sizeof(column_count));
                memset(row_count, 0x00, sizeof(row_count));
                for (int i = 0; i < mat_size; i ++)
                {
                        for (int j = 0; j < mat_size; j ++)
                        {
                                cin >> mat[i][j];
                                column_count[i] += mat[i][j];
                        }
                }
                for (int i = 0; i < mat_size; i ++)
                {
                        for (int j = 0; j < mat_size; j ++)
                        {
                                row_count[i] += mat[j][i];
                        }
                }
                col_odd_cnt = row_odd_cnt = NULL;
                for (int i = 0; i < mat_size; i ++)
                {
#ifdef DEBUG
                        cout << "column_count " << column_count[i]
                                << " row_count " << row_count[i] << endl;
#endif
                        if (column_count[i] % 2 != 0)
                        {
                                col_odd_cnt ++;
                                change_bit[0] = i;
                        }
                        if (row_count[i] % 2 != 0)
                        {
                                row_odd_cnt ++;
                                change_bit[1] = i;
                        }
                }
                if (col_odd_cnt == NULL && row_odd_cnt == NULL)
                {
                        cout << "OK" << endl;
                }
                else if (col_odd_cnt == 1 && row_odd_cnt == 1)
                {
                        cout << "Change bit (" << change_bit[0] + 1 << ","
                                << change_bit[1] + 1 << ")" << endl;
                }
                else
                {
                        cout << "Corrupt" << endl;
                }
        }
        return 0;
}