poj-1979 && hdoj - 1312 Red and Black (简单dfs)

http://poj.org/problem?id=1979

基础搜索。

 #include <iostream>
 #include <cstdio>
 #include <cmath>
 #include <vector>
 #include <cstring>
 #include <string>
 #include <algorithm>
 #include <string>
 #include <set>
 #include <functional>
 #include <numeric>
 #include <sstream>
 #include <stack>
 #include <map>
 #include <queue>

 #define CL(arr, val)    memset(arr, val, sizeof(arr))

 #define ll long long
 #define inf 0x7f7f7f7f
 #define lc l,m,rt<<1
 #define rc m + 1,r,rt<<1|1
 #define pi acos(-1.0)

 #define L(x)    (x) << 1
 #define R(x)    (x) << 1 | 1
 #define MID(l, r)   (l + r) >> 1
 #define Min(x, y)   (x) < (y) ? (x) : (y)
 #define Max(x, y)   (x) < (y) ? (y) : (x)
 #define E(x)        (1 << (x))
 #define iabs(x)     (x) < 0 ? -(x) : (x)
 #define OUT(x)  printf("%I64d\n", x)
 #define lowbit(x)   (x)&(-x)
 #define Read()  freopen("a.txt", "r", stdin)
 #define Write() freopen("dout.txt", "w", stdout);
 #define maxn 1000000000
 #define N 25
 using namespace std;

 char filed[][];
 int w,h,sum;
 int dir[][]={-,,,,,,,-};

 void dfs(int x,int y)
 {
     for(int i=;i<;i++)
     {
         int xx=x+dir[i][];
         int yy=y+dir[i][];
         if(xx>=&&xx<h&&yy>=&&yy<w&&filed[xx][yy]=='.')
         {
             sum++;
             filed[xx][yy]='#';
             dfs(xx,yy);
         }
     }
 }
 int main()
 {
     //freopen("a.txt","r",stdin);
     while(~scanf("%d%d",&w,&h)&&w+h)
     {
         getchar();
         for(int i=;i<h;i++)
             scanf("%s",filed[i]);
         int a,b;
         for(int i=;i<h;i++)
             for(int j=;j<w;j++)
             if(filed[i][j]=='@')
             {
                 a=i;
                 b=j;
             }
         //printf("%d %d\n",a,b);
         sum=;
         filed[a][b]='#';
         dfs(a,b);
         printf("%d\n",sum);
     }
    return ;
 }