{"id":128,"date":"2011-08-19T23:12:49","date_gmt":"2011-08-19T15:12:49","guid":{"rendered":"http:\/\/wangkaixuan.tech\/?p=128"},"modified":"2020-06-03T23:13:26","modified_gmt":"2020-06-03T15:13:26","slug":"poj-1979-zoj-2165-red-and-black-%e6%b7%b1%e6%90%9c%e5%81%9a%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.wangkaixuan.tech\/?p=128","title":{"rendered":"poj 1979 zoj 2165 Red and Black \u6df1\u641c\u505a\u6cd5"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\/*\n\u7b2c\u4e00\u4e2a\u6df1\u641c\n\u53c2\u8003\u4e86\u5927\u725b\u7684\u4ee3\u7801\n\u5e76\u4f5c\u4e86\u5c11\u8bb8\u4f18\u5316\n*\/\n#define LOCAL\n#include&lt;iostream>\n#include&lt;cstdio>\n#include&lt;cmath>\n#include&lt;cstring>\n#include&lt;cstdlib>\n#include&lt;cctype>\n#include&lt;iomanip>\n#include&lt;string>\n#include&lt;algorithm>\n#include&lt;ctime>\n#include&lt;stack>\n#include&lt;queue>\n#include&lt;vector>\n#define N 25\nusing namespace std;\nint m,n,ans,rec&#91;N]&#91;N],dir&#91;4]&#91;2]={0,1,0,-1,1,0,-1,0};   \/\/\u63a7\u5236\u8f6c\u5411\nbool legal(int x,int y)                                                  \/\/\u5224\u65ad\u6570\u636e\u662f\u5426\u5408\u6cd5\n{if(x>=1&amp;&amp;x&lt;=m&amp;&amp;y>=1&amp;&amp;y&lt;=n) return true;return false;}\nvoid DFS(int x,int y)                       \/\/\u9012\u5f52\u641c\u7d22\n{\n\tint i,sx,sy;\n\trec&#91;x]&#91;y]=1;ans++;\/\/\u6807\u8bb0\u5f53\u524d\u70b9\u5df2\u7ecf\u904d\u5386\u8fc7\uff0c\u6bcf\u904d\u5386\u4e00\u4e2a\u8282\u70b9ans+1\n\tfor(i=0;i&lt;4;i++)                          \n\t{\n\t\tsx=x+dir&#91;i]&#91;0];sy=y+dir&#91;i]&#91;1];\/\/\u8f6c\u5411\n\t\tif(!rec&#91;sx]&#91;sy]&amp;&amp;legal(sx,sy)) \/\/\u82e5\u5f53\u524d\u7ed3\u70b9\u672a\u88ab\u904d\u5386\u4e14\u201d\u5408\u6cd5\u201c\u904d\u5386\u8be5\u8282\u70b9\n\t\t\t DFS(sx,sy);\n\t}\n}\nint main()\n{\n#ifdef LOCAL\n       freopen(\"input.txt\",\"r\",stdin);\n       freopen(\"output.txt\",\"w\",stdout);\n#endif\n \n\t   int i,j,x,y;char ch;\n\t   while(cin>>n>>m&amp;&amp;m&amp;&amp;n)\n\t   {\n\t\t   memset(rec,0,sizeof(rec));\n\t\t   for(i=1;i&lt;=m;i++)\n\t\t\t{\n\t\t\t\tfor(j=1;j&lt;=n;j++)\n\t\t\t\t{\n\t\t\t\t\tcin>>ch;\n\t\t\t\t\tif(ch=='#') rec&#91;i]&#91;j]=1;\n\t\t\t\t\telse if(ch=='@') {x=i;y=j;}\n\t\t\t\t}\n\t\t\t}\n\t\t    ans=0;  \n\t\t\tDFS(x,y);\n\t\t\tcout&lt;&lt;ans&lt;&lt;endl;\n\t   }\n\t   return 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-128","post","type-post","status-publish","format-standard","hentry","category-06-01-acm"],"_links":{"self":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/128","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=128"}],"version-history":[{"count":0,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/128\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=128"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=128"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=128"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}