洛谷 P3796 AC自动机模板

题意：统计出现次数最多的字符串，按照输入顺序输出这些字符串

#include 
using namespace std;
typedef int LL;
const LL maxn = 500000 + 100;
LL re = -1,ma[maxn],ccnt[maxn];
void init(){
    memset( ccnt,0,sizeof( ccnt ) );
}
struct ac{
    LL ch[maxn][30],fail[maxn],last[maxn],val[maxn],tot;
    void init(){
        tot = 0;
        memset( ch,0,sizeof( ch ) );
        memset( val,0,sizeof( val ) );
    }
    void Insert( char * str,LL i ){
        LL p = 0;
        LL len = strlen( str );
        for( LL i = 0;i < len;i++ ){
            LL c = str[i] - 'a';
            if( !ch[p][c] ) ch[p][c] = ++tot;
            p = ch[p][c];
        }
        ma[i] = p;
        val[p] = 1;
    }
    queue que;
    void Build(){
        for( LL c = 0;c < 26;c++ ){
            LL x = ch[0][c];
            if( !x ) continue;
            fail[x] = 0;
            que.push( x );
            last[x] = 0;
        }
        while( que.size() ){
            LL x = que.front();
            que.pop();
            for( LL c = 0;c < 26;c++ ){
                LL y = ch[x][c];
                if( !y ){
                    LL p = fail[x];
                    while( p && ch[ p ][c] == 0 ) p = fail[p];
                    ch[x][c] = ch[p][c];
                    continue;
                }
                que.push( y );
                LL p = fail[x];
                while( p && ch[ p ][c] == 0 ) p = fail[p];
                fail[y] = ch[p][c];
                last[y] = val[ fail[y] ]  ? fail[y] : last[ fail[y] ];
            }
        }
    }
    void Find( char* str ){
        LL cnt = 0,p = 0;
        LL len = strlen( str );
        for( LL i = 0;i< len;i++ ){
            LL c = str[i] - 'a';
            p = ch[p][c];
            if( val[p] ) {
                ccnt[p]++;
                re = max( re,ccnt[p] );
            }
            LL t = fail[p];
            while( t && val[t] ){
                ccnt[t]++;
                re = max( re,ccnt[t] );
                t = last[t];
            }
        }
    }
}g;









int main()
{
    LL n;
    char str[200][100];
    char str2[1000010];
    while( 1 == scanf("%d",&n) && n){
        init();
        g.init();re = -1;
        for( LL i = 1;i <= n;i++ ){
            scanf("%s",str[i]);
            g.Insert( str[i],i );
        }
        g.Build();
        scanf("%s",str2);
        g.Find( str2 );
        printf("%d\n",re);
        for( LL i = 1;i <= n;i++ ){
            if( ccnt[ma[i]] == re ) printf("%s\n",str[i]);
        }
    }
    return 0;
}