37 lines
892 B
C++
37 lines
892 B
C++
//http://contest-hunter.org:83/contest/0x29%E3%80%8C%E6%90%9C%E7%B4%A2%E3%80%8D%E7%BB%83%E4%B9%A0/2907%20%E4%B9%B3%E8%8D%89%E7%9A%84%E5%85%A5%E4%BE%B5
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#include<cstdio>
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#include<queue>
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#include<algorithm>
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using namespace std;
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char mp[105][105];
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int r,c,mr,mc,res,vis[105][105];
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struct Node { int r,c,s; };
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const int dr[8]={-1,-1,-1,0,1,1,1,0};
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const int dc[8]={-1,0,1,1,1,0,-1,-1};
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d%d%d%d",&c,&r,&mc,&mr);
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mr=r-mr+1;
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for(int i=1;i<=r;i++) scanf("%s",mp[i]+1);
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vis[mr][mc]=true;
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queue<Node> Q;
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Q.push((Node){mr,mc,0});
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while(Q.size())
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{
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Node u=Q.front(); Q.pop();
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for(int i=0;i<8;i++)
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{
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int nr=u.r+dr[i],nc=u.c+dc[i];
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if(nr<1||nr>r||nc<1||nc>c||vis[nr][nc]||mp[nr][nc]=='*') continue;
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res=max(res,u.s+1);
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vis[nr][nc]=true;
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Q.push((Node){nr,nc,u.s+1});
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}
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}
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printf("%d\n",res);
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return 0;
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}
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