hdu1242

/**/
#include <cstdio>
#include <cstring>
#include <cmath>
#include <cctype>
#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <vector>
#include <string>
#include <stack>
#include <queue>

typedef long long LL;
using namespace std;

int n, m;
char s[205][205];
int sx, sy;
int vis[205][205];
int dist[4][2] = {0, 1, 0, -1, 1, 0, -1, 0};

struct node
{
	int x, y, step;
	bool operator <(const node &a)const{
		return step > a.step;
	}
};

void bfs(){
	memset(vis, 0, sizeof(vis));
	priority_queue<node>q;
	q.push(node{sx, sy, 0});
	vis[sx][sy] = 0;
	while(q.size()){
		node u = q.top();
		q.pop();
		for (int i = 0; i < 4; i++){
			int x = u.x + dist[i][0], y = u.y + dist[i][1];
			if(x < 1 || x > n || y < 1 || y > m || s[x][y] == '#') continue;
			if(s[x][y] == 'a'){
				printf("%d\n", u.step + 1);
				return ;
			}
			if(s[x][y] == 'x'){
				if(!vis[x][y] || vis[x][y] > u.step + 2){
					vis[x][y] = u.step + 2;
					q.push(node{x, y, vis[x][y]});
				}
			}else{
				if(!vis[x][y] || vis[x][y] > u.step + 1){
					vis[x][y] = u.step + 1;
					q.push(node{x, y, vis[x][y]});
				}
			}
		}
	}
	printf("Poor ANGEL has to stay in the prison all his life.\n");
}

int main()
{
	//freopen("in.txt", "r", stdin);
	//freopen("out.txt", "w", stdout);

	while(scanf("%d %d", &n, &m) == 2){
		for (int i = 1; i <= n; i++){
			scanf("%s", s[i] + 1);
			for (int j = 1; j <= m; j++){
				if(s[i][j] == 'r'){
					sx = i, sy = j;
					break;
				}
			}
		}
		bfs();
	}

	return 0;
}
/**/

我以为是啥多个起点走到同一个终点，然后在想一个guard只能被杀一次，用优先队列表示路径然后把杀死的变成畅通的路，结果发现是一个起点，哎，气死了