标签:++ val for include pre ble else ace acm
题面
https://www.luogu.org/problem/P3808
题解
#include<bits/stdc++.h> #define N 500010 using namespace std; queue<int> q; struct acmato{ int c[N][26],val[N],fail[N],cnt; void insert(char *s) { int len=strlen(s); int now=0; for (int i=0;i<len;i++) { int v=s[i]-‘a‘; if (!c[now][v]) c[now][v]=++cnt; now=c[now][v]; } val[now]++; } void build() { for (int i=0;i<26;i++) if (c[0][i]) fail[c[0][i]]=0,q.push(c[0][i]); while (!q.empty()) { int u=q.front(); q.pop(); for (int i=0;i<26;i++) if (c[u][i]) fail[c[u][i]]=c[fail[u]][i],q.push(c[u][i]); else c[u][i]=c[fail[u]][i]; } } int query(char *s){ int len=strlen(s); int now=0,ans=0; for (int i=0;i<len;i++) { now=c[now][s[i]-‘a‘]; for (int t=now;t&&val[t]>0;t=fail[t]) ans+=val[t],val[t]=-1; } return ans; } } AC; int n; char p[1000005]; int main(){ scanf("%d",&n); for (int i=1;i<=n;i++) scanf("%s",p),AC.insert(p); AC.build(); scanf("%s",p); int ans=AC.query(p); cout<<ans<<endl; return 0; }
标签:++ val for include pre ble else ace acm
原文地址:https://www.cnblogs.com/shxnb666/p/11427270.html