#include<iostream.h>
char blocks[20][21];
bool visit[20][21];
int num;
int W,H;
int x,y;
void markBlocks(int ,int);
void main()
{
	int i,j;
	cin>>W>>H;
	while(W!=0 && H!=0)
	{
		for(i=0;i<H;i++)
		{
			for(j=0;j<W;j++)
			{
				visit[i][j]=false;
				blocks[i][j]='0';
			}
		}
		cin.getline(blocks[0],20);
		for(i=0;i<H;i++)
		{
			cin.getline(blocks[i],W+1,'\n');
			cin.getline(blocks[i+1],20,'\n');
		}
		for(i=0;i<H;i++)
		{
			for(j=0;j<W;j++)
			{		
				if(blocks[i][j]=='@')
				{
					x=i;
					y=j;
					break;
				}
			}
			if(y==j)
				break;
		}
		num=0;
		markBlocks(x,y);
		cout<<num<<endl;
		cin>>W>>H;
	}
}
void markBlocks(int x,int y)
{
	if(visit[x][y])
		return;
	else
	{
		visit[x][y]=true;
		num++;
	}
	if(blocks[x+1][y]=='.')
		markBlocks(x+1,y);
	if(blocks[x-1][y]=='.')
		markBlocks(x-1,y);
	if(blocks[x][y+1]=='.')
		markBlocks(x,y+1);
	if(blocks[x][y-1]=='.')
		markBlocks(x,y-1);
}

• 为什么大家都不理我啊??? (1116) benbenbeibei 2006-04-02 13:35:10