117 lines
2.4 KiB
C++
117 lines
2.4 KiB
C++
#include <cstring>
|
|
#include <cstdio>
|
|
using namespace std;
|
|
int map[700][700];
|
|
int vis[700][700];
|
|
int ansx,ansy;
|
|
int ansd,anssum;
|
|
int n,m;
|
|
int res=0;
|
|
int xx[4]={0,-1,1,0};
|
|
int yy[4]={1,0,0,-1};
|
|
void dfs(int x,int y,int ans,int pre)
|
|
{
|
|
if(pre==-1)
|
|
{
|
|
int i;
|
|
for(i=0;i<4;i++)
|
|
{
|
|
int nx=x+xx[i];
|
|
int ny=y+yy[i];
|
|
if(nx<0||nx>=n||ny<0||ny>=m)
|
|
continue;
|
|
if(vis[nx][ny])
|
|
continue;
|
|
vis[nx][ny]=1;
|
|
dfs(nx,ny,ans+1,i);
|
|
vis[nx][ny]=0;
|
|
if(res>anssum)
|
|
{
|
|
ansx=x;
|
|
ansy=y;
|
|
ansd=i;
|
|
anssum=res;
|
|
}
|
|
}
|
|
return ;
|
|
}
|
|
int i;
|
|
int flag=1;
|
|
int nx=x+xx[pre];
|
|
int ny=y+yy[pre];
|
|
if(nx>=0&&nx<n&&ny>=0&&ny<m&&!vis[nx][ny])
|
|
{
|
|
vis[nx][ny]=1;
|
|
dfs(nx,ny,ans+1,pre);
|
|
vis[nx][ny]=0;
|
|
flag=0;
|
|
}
|
|
else
|
|
{
|
|
for(i=0;i<4;i++)
|
|
{
|
|
if(i==pre)
|
|
continue;
|
|
nx=x+xx[i];
|
|
ny=y+yy[i];
|
|
if(nx<0||nx>=n||ny<0||ny>=m)
|
|
continue;
|
|
if(vis[nx][ny])
|
|
continue;
|
|
vis[nx][ny]=1;
|
|
dfs(nx,ny,ans+1,i);
|
|
vis[nx][ny]=0;
|
|
flag=0;
|
|
}
|
|
}
|
|
if(flag)
|
|
{
|
|
if(res<ans)
|
|
res=ans;
|
|
}
|
|
}
|
|
int main()
|
|
{
|
|
int cas=0;
|
|
while(scanf("%d%d",&n,&m)!=EOF)
|
|
{
|
|
cas++;
|
|
if(n==0&&m==0)
|
|
break;
|
|
int r;
|
|
scanf("%d",&r);
|
|
int i;
|
|
memset(vis,0,sizeof(vis));
|
|
for(i=0;i<r;i++)
|
|
{
|
|
int x,y;
|
|
scanf("%d%d",&x,&y);
|
|
vis[x][y]=1;
|
|
}
|
|
int j;
|
|
anssum=-1;
|
|
res=0;
|
|
for(i=0;i<n;i++)
|
|
{
|
|
for(j=0;j<m;j++)
|
|
{
|
|
if(!vis[i][j])
|
|
{
|
|
vis[i][j]=1;
|
|
dfs(i,j,1,-1);
|
|
vis[i][j]=0;
|
|
}
|
|
}
|
|
}
|
|
printf("Case %d: %d %d %d ",cas,anssum,ansx,ansy);
|
|
if(ansd==0)
|
|
printf("E\n");
|
|
else if(ansd==1)
|
|
printf("N\n");
|
|
else if(ansd==2)
|
|
printf("S\n");
|
|
else if(ansd==3)
|
|
printf("W\n");
|
|
}
|
|
}
|