{"id":198,"date":"2011-08-24T12:38:15","date_gmt":"2011-08-24T04:38:15","guid":{"rendered":"http:\/\/wangkaixuan.tech\/?p=198"},"modified":"2020-06-04T12:38:46","modified_gmt":"2020-06-04T04:38:46","slug":"zoj-1671-walking-ant","status":"publish","type":"post","link":"http:\/\/www.wangkaixuan.tech\/?p=198","title":{"rendered":"zoj 1671 Walking Ant"},"content":{"rendered":"\n
#include<iostream>\n#include<cstdio>\n#include<cmath>\n#include<cstring>\n#include<cstdlib>\n#include<cctype>\n#include<iomanip>\n#include<string>\n#include<algorithm>\n#include<ctime>\n#include<stack>\n#include<queue>\n#include<vector>\n#define N 10\nusing namespace std;\nclass ANT\n{public:int step,hp,x,y;};\nint map[N][N],dir[4][2]={0,1,0,-1,1,0,-1,0};\nint m,n,hp[N][N];\nANT ant,antin;\nqueue<ANT>q;\nbool legal(ANT &ant)\n{if(ant.x>=1&&ant.x<=m&&ant.y>=1&&ant.y<=n)return true;return false;}\nint BFS()\n{\n\tint i;\t\t\n\twhile(!q.empty())\n\t\/\/\u603b\u4f53\u6765\u8bb2\u53ea\u6709\u5f53\u8682\u8681\u6d3b\u7740\u7684\u65f6\u5019\u5176\u8def\u5f84\u624d\u4f1a\u5165\u961f\u5217\n\t\/\/\u6240\u4ee5\u5f53\u961f\u5217\u7a7a\u7684\u65f6\u5019\u8fd8\u6ca1\u627e\u5230\u51fa\u53e3\u90a3\u4e48\u8be5\u8682\u8681\u4e00\u5b9a\u662f\u6b7b\u5728\u4e86\u56de\u5de2\u7684\u8def\u4e0a\u76f4\u63a5\u8fd4\u56de-1\u5373\u53ef\n\t{\n\t\t\t    ant=q.front();q.pop();\n\t\t\t\tif(ant.hp==0) continue;\/\/hp==0\u4e0d\u518d\u8003\u8651\uff0c\u8682\u8681\u6b7b\u6389\uff0c\u518d\u8003\u8651\u65e0\u610f\u4e49\n\t\t\t\tfor(i=0;i<4;i++)\n\t\t\t\t{\n\t\t\t\t\tantin.x=ant.x+dir[i][0];antin.y=ant.y+dir[i][1];antin.step=ant.step+1;\/\/\u8f6c\u5411\u6b65\u957f\u52a0\u4e00\n\t\t\t\t\tif(legal(antin)&&map[antin.x][antin.y]>=1&&ant.hp-1>hp[antin.x][antin.y])\n\t\t\t\t\t\/\/\u82e5\u5f53\u524d\u4f4d\u7f6e\u5408\u6cd5\uff0c\u5730\u56fe\u4e0a\u663e\u793a\u53ef\u8d70\uff0c\n\t\t\t\t\t\/\/\u5373\u4f7f\u662f\u5f53\u524d\u4f4d\u7f6e\u4e0a\u6ca1\u6709\u98df\u7269\u8be5\u8682\u8681hp\u4e5f\u6bd4\u4e0a\u4e00\u6b21\u7ecf\u8fc7\u8fd9\u91cc\u65f6\u5269\u4f59\u7684hp\u591a\n\t\t\t\t\t{\n\t\t\t\t\t\tif(map[antin.x][antin.y]==3)\/\/\u627e\u5230nest\u8fd4\u56de\n\t\t\t\t\t\t\treturn antin.step;\n\t\t\t\t\t\t\/*\n\t\t\t\t\t\t*\u53ea\u6709\u4e24\u79cd\u60c5\u51b5\u8def\u5f84\u624d\u4f1a\u5165\u961f\u5217\n\t\t\t\t\t\t*\u4e00\u662f\u6709\u98df\u7269(4)\n\t\t\t\t\t\t*\u4e8c\u662f\u672c\u6765\u5c31\u662f\u53ef\u8d70\u8def\u5f84(1)\n\t\t\t\t\t\t*\u8d77\u59cb\u4f4d\u7f6e(2)\u4e0d\u7528\u518d\u8d70\u56e0\u4e3a\u8d77\u59cb\u4f4d\u7f6ehp\u4e3a6\u8f6c\u4e86\u4e00\u5708\u53c8\u56de\u5230\u8d77\u59cb\u4f4d\u7f6e\u662f\u4e0d\u5212\u7b97\u7684\n\t\t\t\t\t\t*\/\n\t\t\t\t\t\tif(map[antin.x][antin.y]==4)\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\tantin.hp=6;\n\t\t\t\t\t\t\thp[antin.x][antin.y]=6;\n\t\t\t\t\t\t\tq.push(antin);\n\t\t\t\t\t\t}\n\t\t\t\t\t\tif(map[antin.x][antin.y]==1)\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\thp[antin.x][antin.y]=antin.hp=ant.hp-1;\n\t\t\t\t\t\t\tq.push(antin);\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t}\n\treturn -1;\n}\nint main()\n{\n     \/\/\/  freopen(\"input.txt\",\"r\",stdin);\n      \/\/ freopen(\"output.txt\",\"w\",stdout);\n\t   int nestx,nesty,i,j; \n\t   while(cin>>n>>m&&n&&m)\n\t   {\n\t\t\twhile(!q.empty()) q.pop();\/\/\u6e05\u7a7a\u961f\u5217\n\t\t   memset(hp,0,sizeof(hp));\n\t\t   for(i=1;i<=m;i++)\n\t\t\t{\n\t\t\t\tfor(j=1;j<=n;j++)\n\t\t\t\t{\n\t\t\t\t\tcin>>map[i][j];\n\t\t\t\t\tif(map[i][j]==2)\/\/\u786e\u5b9a\u8d77\u59cb\u4f4d\u7f6e\n\t\t\t\t\t{\/\/\u521d\u59cb\u5316\n\t\t\t\t\t\tant.x=i;ant.y=j;ant.hp=6;ant.step=0;\n\t\t\t\t\t\tq.push(ant);\n\t\t\t\t\t\thp[i][j]=6;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t\tcout<<BFS()<<endl;\n\t   }\n\t\treturn 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-198","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\/198","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=198"}],"version-history":[{"count":0,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/198\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=198"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}