单词建出AC自动机，然后在自动机上做DP
d[i][j]表示第i个字符匹配到节点j上的方案数
直接算有点麻烦，统计不满足的方案数就好了
1 #include<bits/stdc++.h> 2 #define inc(i,l,r) for(int i=l;i<=r;i++) 3 #define dec(i,l,r) for(int i=l;i>=r;i--) 4 #define link(x) for(edge *j=h[x];j;j=j->next) 5 #define mem(a) memset(a,0,sizeof(a)) 6 #define inf 10007 7 #define ll long long 8 #define succ(x) (1<<x) 9 #define lowbit(x) (x&(-x)) 10 #define ida(x) (x-'A') 11 #define NM 100+5 12 using namespace std; 13 int read(){ 14 int x=0,f=1;char ch=getchar(); 15 while(!isdigit(ch)){if(ch=='-')f=-1;ch=getchar();} 16 while(isdigit(ch))x=x*10+ch-'0',ch=getchar(); 17 return x*f; 18 } 19 const int cnt=25; 20 struct node{ 21 node *c[cnt+1],*f; 22 bool s; 23 int id; 24 }N[100*NM],*o=N,*root; 25 node* newnode(){ 26 o->id=o-N;o->f=root;o->s=0;return o++; 27 } 28 char st[NM]; 29 int n,m,d[100*NM],f[100*NM],ans; 30 void ins(){ 31 node *r=root; 32 scanf("%s",st);int len=strlen(st)-1; 33 inc(i,0,len){ 34 if(!r->c[ida(st[i])])r->c[ida(st[i])]=newnode(); 35 r=r->c[ida(st[i])]; 36 } 37 r->s=true; 38 } 39 void bfs(){ 40 queue<node*>q; 41 inc(i,0,cnt)if(root->c[i])q.push(root->c[i]); 42 while(!q.empty()){ 43 node *t=q.front();q.pop(); 44 inc(i,0,cnt)if(t->c[i]){ 45 node *r=t->f; 46 while(r!=root&&!r->c[i])r=r->f; 47 t->c[i]->f=r->c[i]?r->c[i]:root; 48 if(t->c[i]->f->s)t->c[i]->s=true; 49 q.push(t->c[i]); 50 } 51 } 52 } 53 void dp(node *r){ 54 if(r->s)return; 55 inc(i,0,cnt)if(r->c[i]){ 56 (d[r->c[i]->id]+=f[r->id])%=inf; 57 dp(r->c[i]); 58 }else{ 59 node *t=r->f; 60 while(t!=root&&!t->c[i])t=t->f; 61 if(t->c[i])(d[t->c[i]->id]+=f[r->id])%=inf;else (d[0]+=f[r->id])%=inf; 62 } 63 } 64 void dfs(node *r){ 65 if(r->s)return; 66 inc(i,0,cnt)if(r->c[i])dfs(r->c[i]); 67 (ans+=inf-f[r->id])%=inf; 68 } 69 int main(){ 70 // freopen("data.in","r",stdin); 71 root=newnode();root->f=root; 72 n=read();m=read(); 73 inc(i,1,n)ins(); 74 bfs();ans=1;f[0]++; 75 inc(i,1,m){ 76 (ans*=26)%=inf; 77 dp(root); 78 memcpy(f,d,sizeof(d));mem(d); 79 // inc(i,0,o-N)printf("%d ",f[i]);printf("\n"); 80 } 81 dfs(root); 82 printf("%d\n",ans); 83 return 0; 84 }
