#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<math.h>
#define ll long long




using	namespace	std;
const	char	black = '.',red = '#';
const	int	MAX = 20+110;
char	tile[MAX][MAX];
int	W,H;
int direction[4][2]={{0,1},{0,-1},{-1,0},{1,0}};
int	pos[2],cnt;
void	dfs(int	x,int	y);

int	main()
{
	while(scanf("%d %d",&W,&H)!=-1)
	{
		memset(tile,0,sizeof(tile));
		if(W==0 && H==0)
			return 0;
		cnt = 0;
		fflush(stdin);
		for(int	i = 1;i<=H;i ++)
		{
			for(int	j = 1;j<=W;j ++)
			{
				scanf("%c",&tile[i][j]);
				if(tile[i][j]=='@')
				{
					pos[0] = i;
					pos[1] = j;
				}
			}
			fflush(stdin);
		}
		tile[pos[0]][pos[1]] = black;
		dfs(pos[0],pos[1]);
		cout<<cnt<<endl;
	}	
}
void	dfs(int	x,int	y)
{
	int	tx,ty;
	cnt ++;
	tile[x][y] = red;
	for(int	i = 0;i<4;i ++)
	{
			tx = x+direction[i][0];
			ty = y+direction[i][1];
			if(tx<=H&&tx>=1&&ty<=W&&ty>=1&&tile[tx][ty]==black)
				dfs(tx,ty);
	}
	return ;
}

• Re:为什么WA 了 求大佬看看 (18) Twhiter 2019-05-30 20:36:39