acm 10116 robot motion 機器人運動

#define col 12
int step, r, c;
char motion[row][col];
int record[row][col];
void (int x, int y)
{
   int i, j;
   record[x][y] = step ++;
   
   switch (motion[x][y])
   {
       case 'N':
           x --;
           break;
       case 'E':
           y ++;
           break;
       case 'W':
           y --;
           break;
       case 'S':
           x ++;
           break;
    }
   
    if (x < 0 || x >= r || y < 0 || y >= c)
    {
        printf("%d step(s) to exitn", step - 1);
        return;
    }   
    if (record[x][y] != -1 )
    {
        int k = step - record[x][y];
        printf("%d step(s) before a loop of %d step(s)n", step - k - 1, k);
        return;  
    }
    move(x, y);
 
}