OJ-Problems-Source/HDOJ/4285_autoAC.cpp

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#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<string.h>
using namespace std;
const int MAXD=15;
const int STATE=1000010;
const int HASH=300007;
const int MOD=1000000007;
int N,M,K;
int maze[MAXD][MAXD];
int code[MAXD];
int ch[MAXD];
int num;
struct HASHMAP
{
int head[HASH],next[STATE],size;
long long state[STATE];
int f[STATE];
void init()
{
size=0;
memset(head,-1,sizeof(head));
}
void push(long long st,int ans)
{
int i;
int h=st%HASH;
for(i=head[h];i!=-1;i=next[i])
if(state[i]==st)
{
f[i]+=ans;
f[i]%=MOD;
return;
}
state[size]=st;
f[size]=ans;
next[size]=head[h];
head[h]=size++;
}
}hm[2];
void decode(int *code,int m,long long st)
{
num=st&63;
st>>=6;
for(int i=m;i>=0;i--)
{
code[i]=st&7;
st>>=3;
}
}
long long encode(int *code,int m)
{
int cnt=1;
memset(ch,-1,sizeof(ch));
ch[0]=0;
long long st=0;
for(int i=0;i<=m;i++)
{
if(ch[code[i]]==-1)ch[code[i]]=cnt++;
code[i]=ch[code[i]];
st<<=3;
st|=code[i];
}
st<<=6;
st|=num;
return st;
}
void shift(int *code,int m)
{
for(int i=m;i>0;i--)code[i]=code[i-1];
code[0]=0;
}
void dpblank(int i,int j,int cur)
{
int k,left,up;
for(k=0;k<hm[cur].size;k++)
{
decode(code,M,hm[cur].state[k]);
left=code[j-1];
up=code[j];
if(left&&up)
{
if(left==up)
{
if(num>=K)continue;
int t=0;
for(int p=0;p<j-1;p++)
if(code[p])t++;
if(t&1)continue;
if(num<K)
{
num++;
code[j-1]=code[j]=0;
hm[cur^1].push(encode(code,j==M?M-1:M),hm[cur].f[k]);
}
}
else
{
code[j-1]=code[j]=0;
for(int t=0;t<=M;t++)
if(code[t]==up)
code[t]=left;
hm[cur^1].push(encode(code,j==M?M-1:M),hm[cur].f[k]);
}
}
else if(left||up)
{
int t;
if(left)t=left;
else t=up;
if(maze[i][j+1])
{
code[j-1]=0;
code[j]=t;
hm[cur^1].push(encode(code,M),hm[cur].f[k]);
}
if(maze[i+1][j])
{
code[j]=0;
code[j-1]=t;
hm[cur^1].push(encode(code,j==M?M-1:M),hm[cur].f[k]);
}
}
else
{
if(maze[i][j+1]&&maze[i+1][j])
{
code[j-1]=code[j]=13;
hm[cur^1].push(encode(code,j==M?M-1:M),hm[cur].f[k]);
}
}
}
}
void dpblock(int i,int j,int cur)
{
int k;
for(k=0;k<hm[cur].size;k++)
{
decode(code,M,hm[cur].state[k]);
code[j-1]=code[j]=0;
hm[cur^1].push(encode(code,j==M?M-1:M),hm[cur].f[k]);
}
}
char str[20];
void init()
{
scanf("%d%d%d",&N,&M,&K);
memset(maze,0,sizeof(maze));
for(int i=1;i<=N;i++)
{
scanf("%s",&str);
for(int j=1;j<=M;j++)
if(str[j-1]=='.')
maze[i][j]=1;
}
}
void solve()
{
int i,j,cur=0;
hm[cur].init();
hm[cur].push(0,1);
for(i=1;i<=N;i++)
for(j=1;j<=M;j++)
{
hm[cur^1].init();
if(maze[i][j])dpblank(i,j,cur);
else dpblock(i,j,cur);
cur^=1;
}
int ans=0;
for(i=0;i<hm[cur].size;i++)
if(hm[cur].state[i]==K)
{
ans+=hm[cur].f[i];
ans%=MOD;
}
printf("%d\n",ans);
}
int main()
{
int T;
scanf("%d",&T);
while(T--)
{
init();
solve();
}
return 0;
}