Nightmare

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 8480    Accepted Submission(s):
4069

Problem Description

Ignatius had a nightmare last night. He found himself
in a labyrinth with a time bomb on him. The labyrinth has an exit, Ignatius
should get out of the labyrinth before the bomb explodes. The initial exploding
time of the bomb is set to 6 minutes. To prevent the bomb from exploding by
shake, Ignatius had to move slowly, that is to move from one area to the nearest
area(that is, if Ignatius stands on (x,y) now, he could only on (x+1,y),
(x-1,y), (x,y+1), or (x,y-1) in the next minute) takes him 1 minute. Some area
in the labyrinth contains a Bomb-Reset-Equipment. They could reset the exploding
time to 6 minutes.

Given the layout of the labyrinth and Ignatius‘ start
position, please tell Ignatius whether he could get out of the labyrinth, if he
could, output the minimum time that he has to use to find the exit of the
labyrinth, else output -1.

Here are some rules:
1. We can assume the
labyrinth is a 2 array.
2. Each minute, Ignatius could only get to one of the
nearest area, and he should not walk out of the border, of course he could not
walk on a wall, too.
3. If Ignatius get to the exit when the exploding time
turns to 0, he can‘t get out of the labyrinth.
4. If Ignatius get to the area
which contains Bomb-Rest-Equipment when the exploding time turns to 0, he can‘t
use the equipment to reset the bomb.
5. A Bomb-Reset-Equipment can be used as
many times as you wish, if it is needed, Ignatius can get to any areas in the
labyrinth as many times as you wish.
6. The time to reset the exploding time
can be ignore, in other words, if Ignatius get to an area which contain
Bomb-Rest-Equipment, and the exploding time is larger than 0, the exploding time
would be reset to 6.

Input

The input contains several test cases. The first line
of the input is a single integer T which is the number of test cases. T test
cases follow.
Each test case starts with two integers N and M(1<=N,Mm=8)
which indicate the size of the labyrinth. Then N lines follow, each line
contains M integers. The array indicates the layout of the labyrinth.
There
are five integers which indicate the different type of area in the
labyrinth:
0: The area is a wall, Ignatius should not walk on it.
1: The
area contains nothing, Ignatius can walk on it.
2: Ignatius‘ start position,
Ignatius starts his escape from this position.
3: The exit of the labyrinth,
Ignatius‘ target position.
4: The area contains a Bomb-Reset-Equipment,
Ignatius can delay the exploding time by walking to these areas.

Output

For each test case, if Ignatius can get out of the
labyrinth, you should output the minimum time he needs, else you should just
output -1.

Sample Input

3

3 3

2 1 1

1 1 0

1 1 3

4 8

2 1 1 0 1 1 1 0

1 0 4 1 1 0 4 1

1 0 0 0 0 0 0 1

1 1 1 4 1 1 1 3

5 8

1 2 1 1 1 1 1 4

1 0 0 0 1 0 0 1

1 4 1 0 1 1 0 1

1 0 0 0 0 3 0 1

1 1 4 1 1 1 1 1

Sample Output

4

-1

13

看完题发现这个题以前做过  然而我还是厚颜无耻的把它贴出来了；

题意：2为起点3为终点，0不可以过1可以过，遇到4可以更新时间为6，但是一个4只能用一次，走一步浪费一秒钟，

如果六秒用完还没走出迷宫或者还没遇到4则走不出来了输出-1否则输出步数

#include<stdio.h>
#include<string.h>
#include<queue>
using namespace std;
int map[10][10];
int n,m;
int x1,y1,x2,y2;
struct node
{
	int x,y;
	int time;
	int step;
	friend bool operator < (node a,node b)
	{
		return a.step>b.step;
	}
};
void bfs()
{
	int i,j;
	priority_queue<node>q;
	int move[4][2]={0,1,0,-1,-1,0,1,0};
	node beg,end;
	beg.x=x1;
	beg.y=y1;
	beg.time=6;
	beg.step=0;
	q.push(beg);
	while(!q.empty())
	{
		end=q.top();
		q.pop();
		if(end.x==x2&&end.y==y2)
		{
			printf("%d\n",end.step);
			return ;
		}
		if(end.time==1)
		continue;
		for(i=0;i<4;i++)
		{
			beg.x=end.x+move[i][0];
			beg.y=end.y+move[i][1];
			if(beg.x>=0&&beg.x<n&&beg.y>=0&&beg.y<m&&map[beg.x][beg.y]!=0)
			{
				if(map[beg.x][beg.y]==4)
				{
					beg.time=6;
					map[beg.x][beg.y]=1;
				}
				else
				beg.time=end.time-1;
				beg.step=end.step+1;
				q.push(beg);
			}
		}
	}
	printf("-1\n");
}
int main()
{
    int t,i,j;
    scanf("%d",&t);
    while(t--)
    {
    	scanf("%d%d",&n,&m);
    	for(i=0;i<n;i++)
    	{
    		for(j=0;j<m;j++)
    		{
    			scanf("%d",&map[i][j]);
    			if(map[i][j]==2)
    			{
    				x1=i;y1=j;
    			}
    			else if(map[i][j]==3)
    			{
    				x2=i;y2=j;
    			}
    		}
    	}
    	bfs();
    }
	return 0;
}