(Qmazon)

"(C++)"C++QtPCQQ

http://www2.informatik.uni-freiburg.de/~cziegler/BX/

csv

build

[email protected] Wechat:r7ma_1

CLIGUIVSDev-CppCLIQt Creator

base.h(book)(user)base.hMain.cpp

1

ifstreamBooknewbooknewbook

books.insert(map<string, Book>::value_type(IS, newbook));

bookmapISnewbookISBN

getline(file, value, ';');
IS = string(value, 1, value.length() - 2);

ISvalue c++file.close();

2

3

ifstream

getline(file, value, ';');
string(value, 1, value.length() - 2);

ISIDmapbookuser

users[ID].booksRead.insert(map<string, int>::value_type(IS, rank));
books[IS].usersRead.insert(map<string, int>::value_type(ID, rank));

file.close();bookuserbook

map<string, Book>::iterator iter = books.begin();
	for (; iter != books.end(); iter++)
	{
		iter->second.aveRank = iter->second.sum / iter->second.cnt;
	}

4

#####book ofstream

file << "\"ISBN\";\"Book-Title\";\"Book-Author\";\"Year-Of-Publication\";\"Publisher\""<< ";\"Image-URL-S\";\"Image-URL-M\";\"Image-URL-L\"" << endl;

\

file.close();

#####user ofstream

file2 << "\"User-ID\";\"Location\";\"Age\"" << endl;

\

file.close();

#####rankofstream

file3 << "\"User-ID\";\"ISBN\";\"Book-Rating\"" << endl;

\

file.close();

NN recommendsystem1.cpp

User:: getrecommendation()

ABABpsumup,sumdown1,sumdown2ABA

map<string, double>Sims

idString 27w+

PPPmap<string, double> RankPrestringISBNdouble mapVector

void sortMapByValue(map<string, double>& tMap, vector<pair<string, double> >& tVector)

RankpreRvectorRvector SimsSimssortMapByValueSvector 10isequal1

Qt

QtC++Main.cppQt

void menu_admin::on_pushButton_3_clicked()
{
    bool ok;
    // 
    QString qid = QInputDialog::getText(this,tr("input"),
              tr("input the id:"),QLineEdit::Normal,tr("admin"),&ok);
    string id=qid.toStdString();
    if(books.find(id)!=books.end()){
        books[id].deletebook();
    }
    else{
        QMessageBox::information(this,tr("tip"),
                         tr("cannot find so you cannot delete!"),QMessageBox::Ok);
    }
}

uiuiQtuiQtuiqssqsscss

1

mapC++mapkeyO(logn)map O(logn)O(nlogn)O(logn)

O(n)O(n)

O(1)

O(n)200O(1)20020

O(n),O(n)

O(n)

2

N*M O(n*m)mapO(n)O(m)O(n*m)

csv118MB