OJ-Problems-Source/HDOJ/3377_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 HASH=10007;
const int STATE=1000010;
int N,M;
int maze[MAXD][MAXD];
int score[MAXD][MAXD];
int code[MAXD];
int ch[MAXD];
struct HASHMAP
{
int head[HASH],state[STATE],next[STATE],size;
int dp[STATE];
void init()
{
size=0;
memset(head,-1,sizeof(head));
}
void push(int st,int ans)
{
int i,h=st%HASH;
for(i=head[h];i!=-1;i=next[i])
if(state[i]==st)
{
if(dp[i]<ans)dp[i]=ans;
return;
}
state[size]=st;
dp[size]=ans;
next[size]=head[h];
head[h]=size++;
}
}hm[2];
void decode(int *code,int m,int st)
{
for(int i=m;i>=0;i--)
{
code[i]=st&7;
st>>=3;
}
}
int encode(int *code,int m)
{
int cnt=1;
memset(ch,-1,sizeof(ch));
ch[0]=0;
int 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];
}
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((i==1&&j==1)||(i==N&&j==M))
{
if((left&&(!up))||((!left)&&up))
{
code[j-1]=code[j]=0;
if(j==M)shift(code,M);
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
else if(left==0&&up==0)
{
if(maze[i][j+1])
{
code[j-1]=0;
code[j]=13;
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
if(maze[i][j+1])
{
code[j-1]=13;
code[j]=0;
if(j==M)shift(code,M);
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
}
continue;
}
if(left&&up)
{
if(left==up)
{
}
else
{
code[j-1]=code[j]=0;
for(int t=0;t<=M;t++)
if(code[t]==up)
code[t]=left;
if(j==M)shift(code,M);
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
}
else if((left&&(!up))||((!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].dp[k]+score[i][j]);
}
if(maze[i+1][j])
{
code[j]=0;
code[j-1]=t;
if(j==M)shift(code,M);
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
}
else
{
if(maze[i][j+1]&&maze[i+1][j])
{
code[j]=code[j-1]=13;
hm[cur^1].push(encode(code,M),hm[cur].dp[k]+score[i][j]);
}
code[j-1]=code[j]=0;
if(j==M)shift(code,M);
hm[cur^1].push(encode(code,M),hm[cur].dp[k]);
}
}
}
void init()
{
memset(maze,0,sizeof(maze));
for(int i=1;i<=N;i++)
for(int j=1;j<=M;j++)
{
maze[i][j]=1;
scanf("%d",&score[i][j]);
}
}
void solve()
{
int i,j,cur=0;
hm[cur].init();
hm[cur].push(0,0);
for(int i=1;i<=N;i++)
for(int j=1;j<=M;j++)
{
hm[cur^1].init();
dpblank(i,j,cur);
cur^=1;
}
int ans=0;
for(int i=0;i<hm[cur].size;i++)
ans+=hm[cur].dp[i];
printf("%d\n",ans);
}
int main()
{
int iCase=0;
while(scanf("%d%d",&N,&M)!=EOF)
{
iCase++;
printf("Case %d: ",iCase);
init();
if(N==1&&M==1)
{
printf("%d\n",score[1][1]);
continue;
}
solve();
}
return 0;
}