hdu1242 Rescue

hdu1242 Rescue

广搜的模板

弄明白之后就觉得……太简单了

#include
#include
using namespace std;

char mp[201][201];
int m,n,dir[4][2]={{1,0},{-1,0},{0,1},{0,-1}};

struct point
{
	int x,y,step;
	friend bool operator <(point t1,point t2)
	{
		return t1.step>t2.step;
	}
};

void bfs(point S)
{
	int i;
	point t,tt;
	priority_queueQ;
	Q.push(S);
	while(!Q.empty())
	{
		t=Q.top();
		Q.pop();
		for(i=0;i<4;i++)
		{
			tt.x=t.x+dir[i][0];tt.y=t.y+dir[i][1];  tt.step=t.step+1;
			if(tt.x<1||tt.x>m||tt.y<1||tt.y>n||mp[tt.x][tt.y]=='#') continue;
			if(mp[tt.x][tt.y]=='r')	{printf("%d\n",tt.step);return;}
			if(mp[tt.x][tt.y]=='x') tt.step++;
			
			mp[tt.x][tt.y]='#';
			Q.push(tt);
		}
	}
	printf("Poor ANGEL has to stay in the prison all his life.\n");
	return;
}

int main()
{
	int i,j;
	point S;
	
	while(scanf("%d%d",&m,&n)!=EOF)
	{
		getchar();
		for(i=1;i<=m;i++)
		{
			for(j=1;j<=n;j++)
			{
				scanf("%c",&mp[i][j]);
				if(mp[i][j]=='a')
				{
					S.x=i;
					S.y=j;
					S.step=0;
				}
			}
			getchar();
		}
		bfs(S);
	}
	return 0;
}