城堡——搜索，稍微有点水，令人惊异的是被洛谷评为提高+

 1 #include<queue>
 2 #include<iostream>
 3 using namespace std;
 4 const int N=64,ax[]={0,0,1,-1,0},ay[]={0,-1,0,0,1},dr[]={0,1,8,2,4};
 5 const char conv[]={‘\0‘,‘W‘,‘S‘,‘N‘,‘E‘};
 6 struct pnt{int x,y;pnt(int n1,int n2):x(n1),y(n2){}};
 7 int r,c,arg[N][N];
 8 int rooms=1,largest,ans,fnx,fny,fnd,size[N],code[N][N];
 9 bool bfsed[N][N];
10 int bfs(int sx,int sy){
11     int res=1;
12     queue<pnt> q;
13     q.push(pnt(sx,sy));
14     bfsed[sx][sy]=true;
15     code[sx][sy]=rooms;
16     while(!q.empty()){
17         int x=q.front().x,y=q.front().y;
18         q.pop();
19         for(int i=1;i<=4;i++){
20             int nx=x+ax[i],ny=y+ay[i];
21             if(nx<1||nx>r||ny<1||ny>c||bfsed[nx][ny]||arg[x][y]&dr[i])continue;
22             res++;
23             bfsed[nx][ny]=true;
24             code[nx][ny]=rooms;
25             q.push(pnt(nx,ny));
26         }
27     }
28     return res;
29 }
30 int main(){
31     cin>>c>>r;
32     for(int i=1;i<=r;i++)
33         for(int j=1;j<=c;j++)
34             cin>>arg[i][j];
35     for(int i=1;i<=r;i++)
36         for(int j=1;j<=c;j++)
37             if(!bfsed[i][j])
38                 largest=max(largest,size[rooms]=bfs(i,j)),rooms++;
39     for(int j=c;j>=1;j--)
40         for(int i=1;i<=r;i++){
41             if(i>1&&(arg[i][j]&2)&&code[i][j]!=code[i-1][j]){
42                 if(size[code[i-1][j]]+size[code[i][j]]>=ans){
43                     ans=size[code[i-1][j]]+size[code[i][j]];
44                     fnx=i;fny=j;fnd=3;
45                 }
46             }
47             else if(j<c&&(arg[i][j]&4)&&code[i][j]!=code[i][j+1]){
48                 if(size[code[i][j+1]]+size[code[i][j]]>=ans){
49                     ans=size[code[i][j+1]]+size[code[i][j]];
50                     fnx=i;fny=j;fnd=4;
51                 }
52             }
53         }
54     cout<<rooms-1<<endl<<largest<<endl<<ans<<endl
55         <<fnx<<" "<<fny<<" "<<conv[fnd]<<endl;
56     return 0;
57 }