(HDU1242)Rescue

任意门：http://acm.hdu.edu.cn/showproblem.php?pid=1242

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define M 222

int n,m,a,b,X,Y;
int vis[M][M];
char ma[M][M];
int dir[4][2]={0,1,0,-1,1,0,-1,0};
struct state
{
    int x,y,step;
    friend bool operator<(state x1,state x2){
        return x1.step>x2.step;  //优先队列，按照步数从小到大排列（最小优先队列）
    }
};

bool check(int x,int y)
{
    if(x<0||y<0||x>=n||y>=m||vis[x][y]||ma[x][y]=='#')
        return 1;
    return 0;
}

int BFS()
{
    priority_queue <state> Q;
    state st,next;
    st.x=a;
    st.y=b;
    st.step=0;
    Q.push(st);
    vis[a][b]=1;
    while(!Q.empty())
    {
        st=Q.top();
        Q.pop();
        if(st.x==X&&st.y==Y)
            return st.step;
        for(int i=0;i<4;i++)
        {
            next.x=st.x+dir[i][0];
            next.y=st.y+dir[i][1];
            if(check(next.x,next.y))
                continue;

            if(!vis[next.x][next.y]){
                vis[next.x][next.y]=1;
                if(ma[next.x][next.y]=='x')
                    next.step=st.step+2;
                else
                    next.step=st.step+1;
                Q.push(next);
            }
        }
    }
    return 0;
}

int main()
{
    while(~scanf("%d%d",&n,&m)&&n&&m)
    {
        memset(vis,0,sizeof(vis));
        for(int i=0;ifor(int j=0;j<m;j++){
                cin>>ma[i][j];
                if(ma[i][j]=='r')
                {a=i;b=j;}
                if(ma[i][j]=='a')
                {X=i;Y=j;}
            }
        }
        int ans=BFS();
        if(ans)
            cout<else cout<<"Poor ANGEL has to stay in the prison all his life."<return 0;
}