OJ-Problems-Source/HDOJ/4057_autoAC.cpp

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#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<cmath>
#define eps 1e-10
#define N 100005
#define inf 1<<20
#define zero(a) (fabs(a)<eps)
#define lson (step<<1)
#define rson (step<<1|1)
using namespace std;
struct Trie{
int next[4],fail;
int end;
void Init(){next[0]=next[1]=next[2]=next[3]=0;fail=end=0;}
}tree[N];
int dp[2][1005][1<<10];
char str[105];
int val[105],tot;
int id(char ch){
if(ch=='A') return 0;
if(ch=='T') return 1;
if(ch=='G') return 2;
return 3;
}
void Insert(char *s,int len,int k){
int p=0;
for(int i=0;i<len;i++){
int q=id(s[i]);
if(tree[p].next[q]==0){
tree[++tot].Init();
tree[p].next[q]=tot;
}
p=tree[p].next[q];
}
tree[p].end|=(1<<k);
}
void Bulid_Fail(){
int que[N];
int head=0,tail=0;
que[tail++]=0;
while(head<tail){
int p=que[head++];
for(int i=0;i<4;i++){
if(tree[p].next[i]==0)
tree[p].next[i]=tree[tree[p].fail].next[i];
else{
int q=tree[p].next[i];
if(p)
tree[q].fail=tree[tree[p].fail].next[i];
tree[q].end|=tree[tree[q].fail].end;
que[tail++]=q;
}
}
}
}
int n,m;
int get(int state){
int ans=0;
for(int i=0;i<n;i++)
if(state&(1<<i))
ans+=val[i];
return ans;
}
void DP(){
memset(dp,0,sizeof(dp));
dp[0][0][0]=1;
for(int i=1;i<=m;i++){
memset(dp[i&1],0,sizeof(dp[i&1]));
for(int j=0;j<=tot;j++){
for(int k=0;k<4;k++){
for(int r=0;r<(1<<n);r++){
if(dp[(i+1)&1][j][r])
dp[i&1][tree[j].next[k]][r|tree[tree[j].next[k]].end]=1;
}
}
}
}
int ans=-inf;
for(int j=0;j<(1<<n);j++)
for(int i=0;i<=tot;i++)
if(dp[m&1][i][j]){
ans=max(ans,get(j));
break;
}
if(ans<0) puts("No Rabbit after 2012!");
else printf("%d\n",ans);
}
int main(){
while(scanf("%d%d",&n,&m)!=EOF){
tree[0].Init();tot=0;
for(int i=0;i<n;i++){
scanf("%s%d",str,&val[i]);
Insert(str,strlen(str),i);
}
Bulid_Fail();
DP();
}
return 0;
}