poj2251Dungeon Master（bfs模板题）

Posted 2020-09-06 yijiull

题目链接：http://poj.org/problem?id=2251

可以说是bfs的模板题了。

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<iostream>
 4 #include<queue>
 5 using namespace std;
 6 char pic[32][32][32];
 7 int vis[32][32][32];
 8 int dir[6][3]={0,0,1,0,0,-1,1,0,0,-1,0,0,0,1,0,0,-1,0};
 9 
10 int ex,ey,ez;
11 int l,n,m;
12 
13 struct node
14 {
15     int x,y,z;
16     int d;
17 }now,nex;
18 
19 
20 
21 int bfs()
22 {
23 
24     queue<node> q;
25     now.d=0;
26     q.push(now);
27     while(!q.empty())
28     {
29         now=q.front();
30         q.pop();
31         if(now.x==ex&&now.y==ey&&now.z==ez) return now.d;
32         for(int i=0;i<6;i++)
33         {
34             nex.x=now.x+dir[i][0];
35             nex.y=now.y+dir[i][1];
36             nex.z=now.z+dir[i][2];
37             if(!vis[nex.x][nex.y][nex.z]&&pic[nex.x][nex.y][nex.z]!=‘#‘
38                &&nex.x>=0&&nex.x<l&&nex.y>=0&&nex.y<n&&nex.z>=0&&nex.z<m)
39             {
40                 nex.d=now.d+1;
41                 vis[nex.x][nex.y][nex.z]=1;
42                 q.push(nex);
43             }
44         }
45     }
46     return -1;
47 
48 }
49 
50 int main()
51 {
52     while(scanf("%d%d%d",&l,&n,&m)!=EOF&&(m||n||l))
53     {
54         memset(vis,0,sizeof(vis));
55 
56         for(int i=0;i<l;i++)
57             for(int j=0;j<n;j++)
58                  for(int k=0;k<m;k++)
59         {
60                 cin>>pic[i][j][k];
61                   if(pic[i][j][k]==‘S‘) {vis[i][j][k]=1;now.x=i;now.y=j;now.z=k;}
62                   if(pic[i][j][k]==‘E‘) {ex=i;ey=j;ez=k;}
63 
64         }
65         int st=bfs();
66         if(st==-1) puts("Trapped!");
67         else printf("Escaped in %d minute(s).\n", st);
68     }
69     return 0;
70 }