UVA10047 【The Monocycle】

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<queue>
 5 using namespace std;
 6 char a[30][30];
 7 int vis[30][30][4][5];
 8 int n,m;
 9 int dx[4]={-1,0,1,0};
10 int dy[4]={0,1,0,-1};
11 struct node{
12     int x,y,di,co,t;
13     node(int xx,int yy,int d,int c,int st)
14     {
15         x=xx;y=yy;di=d;co=c;t=st;
16     }
17 };
18 queue<node> q;
19 void bfs()
20 {
21     while(!q.empty())
22     {
23         node u=q.front();
24         q.pop();
25         if(a[u.x][u.y]=='T'&&u.co==0)
26         {
27             printf("minimum time = %d sec\n",u.t);
28             return;
29         }
30         int x=u.x,y=u.y,co=u.co;
31         int di=(u.di+1)%4;//向右转
32         if(!vis[x][y][di][co])
33         {
34             vis[x][y][di][co]=1;
35             q.push(node(x,y,di,co,u.t+1));
36         }
37         di=(u.di+3)%4;//向左转
38         if(!vis[x][y][di][co])
39         {
40             vis[x][y][di][co]=1;
41             q.push(node(x,y,di,co,u.t+1));
42         }
43         di=u.di;//前进
44         x+=dx[di];y+=dy[di];
45         co=(co+1)%5;//下一种颜色
46         if(x<n&&x>=0&&y<m&&y>=0&&a[x][y]!='#'&&!vis[x][y][di][co])
47         {
48             q.push(node(x,y,di,co,u.t+1));
49             vis[x][y][di][co]=1;
50         }
51     }
52     printf("destination not reachable\n");
53 }
54 int main()
55 {
56     int ss=1;
57     while(scanf("%d%d",&n,&m)&&n&&m)
58     {
59         if(ss>1) printf("\n");
60         memset(vis,0,sizeof(vis));
61         while(!q.empty()) q.pop();
62         for(int i=0;i<n;i++)
63             for(int j=0;j<m;j++)
64             {
65                 cin>>a[i][j];
66                 if(a[i][j]=='S')
67                 {
68                     q.push(node(i,j,0,0,0));
69                     vis[i][j][0][0]=1;
70                 }
71             }
72         printf("Case #%d\n",ss++);
73         bfs();
74     }
75     return 0;
76 }