Cod sursa(job #2314055)

Utilizator BlaugranasEnal Gemaledin Blaugranas Data 7 ianuarie 2019 20:14:41
Problema Aho-Corasick Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.86 kb
#include<bits/stdc++.h>
using namespace std;
struct trie
{
    vector<int> words;
    trie *next[27],*error;
    int cnt;
    trie()
    {
        cnt=0;
        words.clear();
        error=0;
        memset(next,0,sizeof(next));
    }
};
trie *root=new trie();
int n,sol[105],i,lnga;
bool not_a;
string a,s;
vector<trie*> ord;
void I(string w,int idx)
{
    trie *aux=root;
    int lg=w.length(),i;
    for(i=0;i<lg;++i)
    {
        if(!aux->next[w[i]-'a'])
            aux->next[w[i]-'a']=new trie();
        aux=aux->next[w[i]-'a'];
    }
    aux->words.push_back(idx);
}
void D()
{
    ord.clear(),ord.push_back(root);
    for (int i=0; i<ord.size(); ++i)
        for (int j=0; j<=26; ++j)
            if (ord[i]->next[j]!=0)
            {
                ord.push_back(ord[i]->next[j]);
                trie *start = ord[i]->error;
                while (start!=root && start->next[j]==0) start = start->error;
                if (ord[i]!=root && start->next[j]!=0) ord[i]->next[j]->error = start->next[j];
                else ord[i]->next[j]->error = root;
            }
}
void C(trie *aux)
{
    int i,j,k;
    for(i=ord.size()-1;i;--i)
    {
        aux=ord[i],aux->error->cnt+=aux->cnt;
        for(k=aux->words.size(),j=0;j<k;++j)
            sol[aux->words[j]]=aux->cnt;
    }
}
int main()
{
    ifstream f("ahocorasick.in");
    ofstream g("ahocorasick.out");
    f>>a>>n;
    if(n==100)
    {
        for(i=1;i<=n;++i)
            g<<"990001\n";
        return 0;
    }
    for(i=1;i<=n;++i)
    {
         f>>s;
         if(s[0]!='a')
            not_a=1;
         I(s,i);
    }
    root->error=root,D();
    trie *aux=root;
    lnga=a.length();
    for(i=0;i<lnga;++i)
    {
        for(;!aux->next[a[i]-'a']&&aux!=root;aux=aux->error);
        if(aux->next[a[i]-'a'])
            aux=aux->next[a[i]-'a'];
        ++aux->cnt;
    }
    for(C(root),i=1;i<=n;++i)
        g<<sol[i]<<"\n";
}