usaco 1.5.2 The Clocks

麻麻说，如果研究了三天还是不会做的话，就算了吧。恩。 The Clocks

IOI'94 - Day 2 Consider nine clocks arranged in a 3x3 array thusly:

|-------|    |-------|    |-------|    
|       |    |       |    |   |   |    
|---O   |    |---O   |    |   O   |          
|       |    |       |    |       |           
|-------|    |-------|    |-------|    
    A            B            C

|-------|    |-------|    |-------|
|       |    |       |    |       |
|   O   |    |   O   |    |   O   |
|   |   |    |   |   |    |   |   |
|-------|    |-------|    |-------|
    D            E            F

|-------|    |-------|    |-------|
|       |    |       |    |       |
|   O   |    |   O---|    |   O   |
|   |   |    |       |    |   |   |
|-------|    |-------|    |-------|
    G            H            I

The goal is to find a minimal sequence of moves to return all the dials to 12 o'clock. Nine different ways to turn the dials on the clocks are supplied via a table below; each way is called a move. Select for each move a number 1 through 9 which will cause the dials of the affected clocks (see next table) to be turned 90 degrees clockwise.

Move	Affected clocks
1	ABDE
2	ABC
3	BCEF
4	ADG
5	BDEFH
6	CFI
7	DEGH
8	GHI
9	EFHI

Example

Each number represents a time accoring to following table:

9 9 12       9 12 12       9 12 12        12 12 12      12 12 12 
6 6 6  5 ->  9  9  9  8->  9  9  9  4 ->  12  9  9  9-> 12 12 12 
6 3 6        6  6  6       9  9  9        12  9  9      12 12 12 

[But this might or might not be the `correct' answer; see below.]

PROGRAM NAME: clocks

INPUT FORMAT

Lines 1-3:

Three lines of three space-separated numbers; each number represents the start time of one clock, 3, 6, 9, or 12. The ordering of the numbers corresponds to the first example above.

SAMPLE INPUT (file clocks.in)

9 9 12
6 6 6
6 3 6

OUTPUT FORMAT

A single line that contains a space separated list of the shortest sequence of moves (designated by numbers) which returns all the clocks to 12:00. If there is more than one solution, print the one which gives the lowest number when the moves are concatenated (e.g., 5 2 4 6 < 9 3 1 1).

SAMPLE OUTPUT (file clocks.out)

4 5 8 9

此题大概提交了十几次。备份了三个。再加上拷别人的标答。刷新了做usaco题的悲剧记录。

到目前为止对题解的神展开理解不能。

就……就这样吧……

悲剧的只过了两组数据的bfs：

/*
ID: wtff0411
PROG: clocks
LANG: C++
*/
#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <vector>
#include <cmath>
#include <queue>

using namespace std;

char ans[100];
long long move[10]={0,18911232,19136512, 2363904, 16810048, 2134536, 262657, 36936, 73, 4617};
    
struct p{
       friend bool operator <(p x,p y)
       {
           return strcmp(x.res,y.res)>0;
       }
       long long num;
       char res[100];
};

priority_queue <p> q;
void solve(int n)
{
     
     p pp;
     pp.num=n;
     int i;
     int j=10000;
     pp.res[0]='0';
     q.push(pp);
     while(1)
     {
             //cout<<q.top().num<<endl;
             if(q.top().num==0)
    system("pause");
          p t=q.top();
          q.pop();
          if(t.num==0)
          {
              strcpy(ans,t.res);
              return ;
          }
          for(i=1;i<10;i++)
          {
              p tt;
              tt.num=(t.num+move[i])&57521883;
              strcpy(tt.res,t.res);
              tt.res[0]++;
              tt.res[tt.res[0]-'0']=i+'0';
              q.push(tt);
          }
     }
}
          
          
          
 
         
         

int main()
{
    //freopen("clocks.in","r",stdin);
    //freopen("clocks.out","w",stdout);
    int i,j;
    int input;
    memset(ans,'0',sizeof(ans));
    int origin=0;
   for(i=8;i>=0;i--)
    {
        cin>>input;
        origin+=((input/3)%4)*(int)pow(8.0,i);
    }
    solve(origin);
    
    /*int num;
    for(i=1;;i*=10)
    if(res/i==0)
    {i=i/10;break;}
    
    for(;i>=10;i/=10)
    {
        cout<<res/i<<" ";
        res%=i;
        }
        cout<<res;*/
      //  cout<<ans;
    for(i=1;i<ans[0]-'0';i++)
    {
        cout<<ans[i]<<" ";
        }
        cout<<ans[i];
    cout<<endl;
    system("pause");
    return 0;
}
        

干！还特地去研究了优先队列了呢（虽然以前也做到过，但这次第一次是排自己写的结构啊）。难道是东西太多队列满了- -？烦烦烦烦烦。