为什么要trie
```cpp
#include <bits/stdc++.h>
using namespace std;
const int MAX_N=1000005;
bool dp[MAX_N];
int n,m;
char s[MAX_N];
char str[22][MAX_N];
int len[22];
int main()
{
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
{
scanf("%s",str[i]);
len[i]=strlen(str[i]);
}
while(m--)
{
memset(dp,false,sizeof(dp));
scanf("%s",s);
int siz=strlen(s);
dp[0]=true;
int ans=0;
for(int i=0;i<=siz;i++)
{
if(!dp[i])continue;
ans=i;
for(int j=1;j<=n;j++)
{
if(!memcmp(str[j],s+i,len[j]))dp[i+len[j]]|=dp[i];
}
}
cout<<ans<<endl;
}
return 0;
}
```
by Smile_Cindy @ 2019-05-18 11:42:54
我刚学trie,当然用trie
by doctorZ_ @ 2019-05-18 11:56:01
@[Alpha](/space/show?uid=87058)
by doctorZ_ @ 2019-05-18 11:56:37