OJ-Problems-Source/HDOJ/4064_autoAC.cpp

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# include<stdio.h>
# include<string.h>
# define N 600000
# define mod 1000000007
int n,m;
__int64 dp[2][N],sum;
char map[15][15][5];
int a[200],tag,flag;
int s[15];
void DFS(int r,int up,int down,int num,int right)
{
int xx,rr,yy,ll,i;
if(num==m)
{
if(r==0) dp[flag][down]+=tag;
else
{
dp[flag][down]+=dp[(flag+1)%2][up]*tag;
dp[flag][down]%=mod;
}
return;
}
for(i=1;i<4;i++)
if(map[r][num][i]!=map[r][num][0]) break;
if(i==4)
{
tag*=4;
xx=a[map[r][num][0]];
if(xx==right || right==-1) DFS(r,up*3+xx,down*3+xx,num+1,xx);
tag/=4;
return;
}
for(i=0;i<4;i++)
{
xx=a[map[r][num][i]];
rr=a[map[r][num][(i+1)%4]];
yy=a[map[r][num][(i+2)%4]];
ll=a[map[r][num][(i+3)%4]];
if(right==-1 || ll==right) DFS(r,up*3+xx,down*3+yy,num+1,rr);
}
}
int main()
{
int i,j,ncase,t;
scanf("%d",&ncase);
a['F']=0;
a['C']=1;
a['R']=2;
s[0]=1;
for(i=1;i<=12;i++)
s[i]=s[i-1]*3;
for(t=1;t<=ncase;t++)
{
scanf("%d%d",&n,&m);
for(i=0;i<n;i++)
for(j=0;j<m;j++)
scanf("%s",map[i][j]);
flag=0;
memset(dp,0,sizeof(dp));
for(i=0;i<n;i++)
{
tag=1;
flag=(flag+1)%2;
DFS(i,0,0,0,-1);
for(j=0;j<s[m];j++) dp[(flag+1)%2][j]=0;
}
sum=0;
for(i=0;i<s[m];i++)
{
sum+=dp[flag][i];
sum%=mod;
}
printf("Case %d: %I64d\n",t,sum);
}
return 0;
}