USACO/clocks

http://www.nocow.cn/index.php/Translate:USACO/clocks


BFS注意剪枝。

计算好数组类型和大小。

/*
LANG: C++
PROG: clocks
*/
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
#define NN 16384
#define INF 0x7ffffff
#define eps 1e-6
#define pi 3.14159265358979626

#define N 270000

struct clock
{
    char c[10],step;
    int wh,fro;
}cl[N];

int ans[30],b[30];

int chan[10][5]=
{0,0,0,0,0,
1,2,4,5,0,
1,2,3,0,0,
2,3,5,6,0,
1,4,7,0,0,
2,4,5,6,8,
3,6,9,0,0,
4,5,7,8,0,
7,8,9,0,0,
5,6,8,9,0,
};

bool clo[5][5][5][5][5][5][5][5][5];

bool check(int m)
{
    for (int i=1;i<=9;i++)
    if (cl[m].c[i]!=12) return false;

    return true;
}

int main()
{
    //freopen("a","r",stdin);
    freopen("clocks.in","r",stdin);freopen("clocks.out","w",stdout);

    for (int i=1;i<=9;i++) scanf("%d",&cl[0].c[i]);
    cl[0].c[0]=0;
    cl[0].step=0;
    cl[0].fro=-1;
    memset(clo,true,sizeof(clo));

    int i=0,num=0,t[10],mincount=N,step;
    bool Find=false;
    while (!Find)
    {
        int num1=num;

        for (int j=1;j<=9;j++)
        {
            for (int k=0;k<=9;k++) t[k]=cl[i].c[k];
            for (int k=0;k<5;k++) t[chan[j][k]]=(t[chan[j][k]]+2)%12+1;

            if (clo[t[1]/3][t[2]/3][t[3]/3][t[4]/3][t[5]/3][t[6]/3][t[7]/3][t[8]/3][t[9]/3])
            {
                clo[t[1]/3][t[2]/3][t[3]/3][t[4]/3][t[5]/3][t[6]/3][t[7]/3][t[8]/3][t[9]/3]=false;

                num++;
                cl[num].step=cl[i].step+1;
                cl[num].wh=j;
                cl[num].fro=i;
                for (int k=1;k<=9;k++) cl[num].c[k]=t[k];
            }
        }

        step=cl[num].step;
        for (int j=num1+1;j<=num;j++)
        if (check(j))
        {
            Find=true;

            int count=0,k=j,s=0;
            while (cl[k].fro>-1)
            {
                b[step-s]=cl[k].wh;
                count+=b[step-s];
                s++;
                k=cl[k].fro;
            }

            if (count



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