2013区域赛长沙赛区现场赛 K - Pocket Cube

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<vector>
 5 #include<queue>
 6 #include<algorithm>
 7 #include<map>
 8 #define INF 0x3f3f3f3f
 9 #define M(a,b) memset(a,b,sizeof(a))
10 
11 using namespace std;
12 
13 int state[24];
14 int change[6][24]={
15     {6,1,12,3,5,11,16,7,8,9,4,10,18,13,14,15,20,17,22,19,0,21,2,23},
16     {20,1,22,3,10,4,0,7,8,9,11,5,2,13,14,15,6,17,12,19,16,21,18,23},
17     {1,3,0,2,23,22,4,5,6,7,10,11,12,13,14,15,16,17,18,19,20,21,9,8},
18     {2,0,3,1,6,7,8,9,23,22,10,11,12,13,14,15,16,17,18,19,20,21,5,4},
19     {0,1,11,5,4,16,12,6,2,9,10,17,13,7,3,15,14,8,18,19,20,21,22,23},
20     {0,1,8,14,4,3,7,13,17,9,10,2,6,12,16,15,5,11,18,19,20,21,22,23},
21 };
22 
23 int N;
24 int ans;
25 
26 struct tube
27 {
28     int d[24];
29     int cnt;
30     tube(){}
31 };
32 tube st;
33 tube trans(tube tmp,int k)
34 {
35     tube res;
36 
37     for (int i=0; i<24; i++)
38     res.d[i]=tmp.d[change[k][i]];
39 
40     return res;
41 }
42 int count(tube tmp)
43 {
44     int res=0;
45     if (tmp.d[0]==tmp.d[1] && tmp.d[1]==tmp.d[2] && tmp.d[2]==tmp.d[3]) res++;
46     if (tmp.d[8]==tmp.d[9] && tmp.d[14]==tmp.d[15] && tmp.d[8]==tmp.d[14]) res++;
47     if (tmp.d[6]==tmp.d[7] && tmp.d[7]==tmp.d[12] && tmp.d[12]==tmp.d[13]) res++;
48     if (tmp.d[4]==tmp.d[5] && tmp.d[5]==tmp.d[11] && tmp.d[11]==tmp.d[10]) res++;
49     if (tmp.d[16]==tmp.d[17] && tmp.d[17]==tmp.d[19] && tmp.d[19]==tmp.d[18]) res++;
50     if (tmp.d[20]==tmp.d[21] && tmp.d[21]==tmp.d[22] && tmp.d[22]==tmp.d[23]) res++;
51     return res;
52 }
53 
54 void bfs()
55 {
56     queue<tube> q;
57     q.push(st);
58 //    map<tube,int> mp;
59 //    mp[st]=1;
60     ans=count(st);
61     while(!q.empty())
62     {
63         tube now=q.front();
64         q.pop();
65         tube tmp;
66         for (int i=0; i<6; i++)
67         {
68             tmp=trans(now,i);
69             tmp.cnt=now.cnt+1;
70 //            if (mp.find(tmp)!=mp.end())
71 //            {
72 //                mp[tmp]=1;
73 //                ans=max(ans,count(tmp));
74 //                if (tmp.cnt<num) q.push(tmp);
75 //            }
76             ans=max(ans,count(tmp));
77             if (tmp.cnt<N) q.push(tmp);
78         }
79     }
80 }
81 
82 int main()
83 {
84    //init();
85    while(scanf("%d",&N)==1)
86    {
87        for(int i = 0;i<24;i++)
88        {
89             scanf("%d",&st.d[i]);
90         }
91         st.cnt=0;
92         bfs();
93        printf("%d\n",ans);
94    }
95    return 0;
96 }