OJ-Problems-Source/HDOJ/1254_autoAC.cpp

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2016-08-13 17:16:08 +08:00
#include<cstdio>
#include<cstring>
#include<string>
#include<queue>
#include<algorithm>
#include<queue>
#include<map>
#include<stack>
#include<iostream>
#include<list>
#include<set>
#include<cmath>
#define INF 0x7fffffff
#define eps 1e-6
using namespace std;
int g[8][8];
int xx[]={1,-1,0,0};
int yy[]={0,0,-1,1};
int n,m;
struct node
{
int x,y,lv;
};
node box,man,over;
bool vis[8][8];
bool ok;
void dfs(int x1,int y1,int x2,int y2)
{
if(ok)return;
if(x1==x2&&y1==y2)
{
ok=1;
return;
}
int x,y;
for(int k=0;k<4;k++)
{
x=x1+xx[k];
y=y1+yy[k];
if(x>=n||x<0||y>=m||y<0||g[x][y]==1||vis[x][y])
continue;
vis[x][y]=1;
dfs(x,y,x2,y2);
}
}
int bfs()
{
bool way[8][8][8][8];
queue<node>q;
queue<node>human;
memset(way,0,sizeof(way));
q.push(box);
human.push(man);
way[box.x][box.y][man.x][man.y]=1;
node tmp,now,ma;
while(!q.empty())
{
tmp=q.front();q.pop();
ma=human.front();human.pop();
if(tmp.x==over.x&&tmp.y==over.y)return tmp.lv;
for(int k=0;k<4;k++)
{
int x=tmp.x+xx[k];
int y=tmp.y+yy[k];
if(x>=n||x<0||y>=m||y<0||g[x][y]==1||way[x][y][tmp.x][tmp.y])
continue;
int rex=tmp.x-xx[k];
int rey=tmp.y-yy[k];
if(rex>=n||rex<0||rey>=m||rey<0||g[rex][rey]==1)
continue;
memset(vis,0,sizeof(vis));
ok=0;
vis[tmp.x][tmp.y]=1;
dfs(ma.x,ma.y,rex,rey);
if(!ok)
continue;
now.x=x,now.y=y,now.lv=tmp.lv+1;
way[x][y][tmp.x][tmp.y]=1;
q.push(now);
human.push(tmp);
}
}
return -1;
}
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
scanf("%d%d",&n,&m);
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
{
scanf("%d",&g[i][j]);
if(g[i][j]==2)
box.x=i,box.y=j,box.lv=0;
else if(g[i][j]==3)
over.x=i,over.y=j;
else if(g[i][j]==4)
man.x=i,man.y=j;
}
int tmp=bfs();
printf("%d\n",tmp);
}
}