KMP C++

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KMP C++實現

int * ComputeNext(string P){    int *lsp{ new int[P.length()] };    lsp[0] = 0;  // Base case    int j = 0;    for (int i = 1; i < P.length(); i++)    {//        int j = lsp[i - 1];        while (j > 0 && P.at(i) != P.at(j))            j = lsp[j];        if (P.at(i) == P.at(j))            j++;        lsp[i] = j;    }    return lsp;}int search(string P, string T){    int *lsp= ComputeNext(P);    for (int var = 0; var < P.length(); var++)    {        cout << *(lsp+var) << " ";    }    cout<<endl;    int j = 0;                                    for (int i = 0; i < T.length(); i++)    {        while (j > 0 && T.at(i)!= P.at(j))        {                                                j = *(lsp+j);                                cout<<"-i:"<<j<<endl;        }        cout<<i<<" "<<T.at(i)<<","<<j<<" "<<P.at(j)<<"|| ";        if (T.at(i) == P.at(j))        {            j++;            if (j == P.length())                return (i -P.length()+1) ;            cout<<T.at(i)<<","<<P.at(j)<<":";        }        cout<<i<<"-"<<j<<endl;    }    delete []lsp;    return -1;        }

 

KMP C++