JDOJ 2939: Suffix Automaton 广义后缀自动机_统计子串

Code:

#include <cstdio>
#include <algorithm>
#include <cstring>
#define setIO(s) freopen(s".in","r",stdin)
#define maxn 600000
#define N 30
#define ll long long
using namespace std;
char str[maxn];
int last=1,tot=1,n,m;
int ch[maxn][N],cnt[maxn][2],f[maxn][7],dis[maxn],rk[maxn];
long long C[maxn],ans;
void ins(int c,int id){
    int np=++tot,p=last; last=np;
    if(ch[p][c]){
        int q=ch[p][c];
        if(dis[q]==dis[p]+1) last=q;
        else {
            int nq=++tot; last=nq;
            f[nq][id]=f[q][id],dis[nq]=dis[p]+1;
            memcpy(ch[nq],ch[q],sizeof(ch[q]));
            f[q][id]=nq;
            while(p&&ch[p][c]==q) ch[p][c]=nq,p=f[p][id];
        }
    }
    else{
        dis[np]=dis[p]+1;
        while(p&&!ch[p][c]) {  ch[p][c]=np,p=f[p][id]; }
        if(!p) f[np][id]=1;
        else{
            int q=ch[p][c],nq;
            if(dis[q]==dis[p]+1) f[np][id]=q;
            else{
                nq=++tot;
                dis[nq]=dis[p]+1;
                memcpy(ch[nq],ch[q],sizeof(ch[q]));
                f[nq][id]=f[q][id],f[q][id]=f[np][id]=nq;
                while(p&&ch[p][c]==q) ch[p][c]=nq,p=f[p][id];
            }
        }
        ans+=(dis[np]-dis[f[np][id]]);
    }
}
int main(){
    //setIO("input");
    int t; scanf("%d",&t);
    while(t--)
    {
        scanf("%s",str),n=strlen(str);
        for(int i=0;i<n;++i) ins(str[i]-‘a‘,0),printf("%lld\n",ans);
        last = 1;
    }
    return 0; 

}

原文地址：https://www.cnblogs.com/guangheli/p/10304367.html