p1457 The Castle

Posted 2021-01-14 gaudar

原图找最大的房间及房间数很容易。然后从左下到右上找拆的位置。拆掉再bfs一次找面积。

#include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cstring>
#include <map>
#include <queue>
#include <set>
#include <cassert>
#include <stack>
#define mkp make_pair
using namespace std;
const double EPS=1e-8;
typedef long long lon;
const lon SZ=60,INF=0x7FFFFFFF;
int n,m,arr[SZ][SZ],dx[]={0,-1,0,1},dy[]={-1,0,1,0};
bool vst[SZ][SZ];
struct nd{
    int x,y;
    nd(int a,int b):x(a),y(b){}
};

void init()
{
    cin>>m>>n;
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=m;++j)cin>>arr[i][j];
    }
}

int bfs(int bgx,int bgy)
{
    int res=1;
    queue<nd> q;
    vst[bgx][bgy]=1;
    q.push(nd(bgx,bgy));
    for(;!q.empty();)
    {
        nd frt=q.front();
        q.pop();
        for(int i=0;i<4;++i)
        {
            int nx=frt.x+dx[i],ny=frt.y+dy[i];
            if(!(arr[frt.x][frt.y]&(1<<i))&&nx>=1&&nx<=n&&ny>=1&&ny<=m&&!vst[nx][ny])
            {
                vst[nx][ny]=1;
                q.push(nd(nx,ny));
                ++res;
            }
        }
    }
    return res;
}

void work(int &block,int &maxb)
{
    block=0;
    maxb=0;
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=m;++j)
        {
            if(!vst[i][j])
            {
                maxb=max(maxb,bfs(i,j));
                ++block;
            }
        }
    }
}

void work2(int &maxv,int &maxx,int &maxy,char &maxd)
{
    maxv=0;
    for(int j=1;j<=m;++j)
    {
        for(int i=n;i>=1;--i)
        {
            if(arr[i][j]&2)
            {
                memset(vst,0,sizeof(vst));
                arr[i][j]-=2;
                int cur=bfs(i,j);
                if(cur>maxv)
                {
                    maxv=cur;
                    maxx=i,maxy=j;
                    maxd=‘N‘;
                }
                arr[i][j]+=2;
            }
        }
        for(int i=n;i>=1;--i)
        {
            if(arr[i][j]&4)
            {
                memset(vst,0,sizeof(vst));
                arr[i][j]-=4;
                int cur=bfs(i,j);
                if(cur>maxv)
                {
                    maxv=cur;
                    maxx=i,maxy=j;
                    maxd=‘E‘;
                }
                arr[i][j]+=4;
            }
        }
    }
}

int main()
{
    std::ios::sync_with_stdio(0);
    //freopen("d:\1.txt","r",stdin);
    lon casenum;
    //cin>>casenum;
    //for(lon time=1;time<=casenum;++time)
    {
        init();
        int block,maxb;
        work(block,maxb);
        cout<<block<<endl;
        cout<<maxb<<endl;
        int maxv,maxx,maxy;
        char maxd;
        work2(maxv,maxx,maxy,maxd);
        cout<<maxv<<endl;
        cout<<maxx<<" "<<maxy<<" "<<maxd<<endl;
    }
    return 0;
}