UVA1449 Dominating Patterns

思路

对所有模式串建AC自动机
在AC自动机上跑文本串，得出每个模式串的出现次数，输出即可

AC自动机中的fail指针的意思是指向当前节点的最长的在Trie中存在和该最长后缀相等的前缀的节点

我的AC自动机写法以0为根，0为中止条件

代码

#include <cstdio>
#include <algorithm>
#include <cstring>
#include <queue>
using namespace std;
int Trie[12000][26],Nodecnt,root,fail[12000],isend[12000],cnt[12000],n,ans;
char s[1001000],t[12000][100];
void insert(char *s,int len,int inq){int o=root;for(int i=0;i<len;i++){if(!Trie[o][s[i]-'a'])Trie[o][s[i]-'a']=++Nodecnt;o=Trie[o][s[i]-'a'];}isend[o]=inq;
}
queue<int> q;
void build_AC(void){for(int i=0;i<26;i++)if(Trie[root][i]){fail[Trie[root][i]]=root;q.push(Trie[root][i]);}while(!q.empty()){int x=q.front();q.pop();for(int i=0;i<26;i++){if(Trie[x][i]){fail[Trie[x][i]]=Trie[fail[x]][i];q.push(Trie[x][i]);}elseTrie[x][i]=Trie[fail[x]][i];}}
}
void query(char *s,int len){int o=root;for(int i=0;i<len;i++){o=Trie[o][s[i]-'a'];int p=o;while(p){if(isend[p])cnt[isend[p]]++;p=fail[p];}}
}
void init(void){Nodecnt=0;root=0;memset(Trie,0,sizeof(Trie));memset(fail,0,sizeof(fail));memset(isend,0,sizeof(isend));memset(cnt,0,sizeof(cnt));ans=0;
}
int main(){while(scanf("%d",&n)==1&&n){init();for(int i=1;i<=n;i++){scanf("%s",t[i]);insert(t[i],strlen(t[i]),i);}build_AC();scanf("%s",s);query(s,strlen(s));for(int i=1;i<=n;i++)ans=max(ans,cnt[i]);printf("%d\n",ans);for(int i=1;i<=n;i++)if(cnt[i]==ans)printf("%s\n",t[i]); }return 0;
}

转载于:https://www.cnblogs.com/dreagonm/p/10692179.html

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UVA1449 Dominating Patterns

思路

代码

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