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enum difficult{EASY, MEDIUM, HARD};
using  tab = QPair<difficult, QPair<QString,int>>;
std::multiset<tab, std::function<bool(tab,tab)>>* table;
HighScores::HighScores(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::HighScores)
{
    ui->setupUi(this);
    auto comp = [](tab a, tab b){ return a.first < b.first ? true : a.first == b.first ? a.second.second < b. second.second : false;};
    table = new std::multiset<tab, std::function<bool(tab,tab)>>(comp);
    std::string str, name;
    int time,di;
    file = new QFile("records.txt");
    if (file->exists()){
        file->open(QIODevice::ReadOnly);
        while(!file->atEnd()){
            str = file->readLine().toStdString();
            std::istringstream a(str);
            a >> name;
            a >> time;
            a >> di;
            table->insert(tab(static_cast<difficult>(di), QPair<QString,int>(QString(name.c_str()), time) ));
        }
        file->resize(0);
        file->close();
    }
}
 
HighScores::~HighScores()
{
    delete ui;
}
 
void HighScores::callAddIf(difficult diff){
    emit gettime();
    int h = 0;
 
    for(auto& i : *table)
        if(i.first==diff)
            h++;
    auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
    for(auto& i : *table)
        if(i.first == diff)
            temp = i;
    if(h < 10 || temp.second.second > time){
        QString name = QInputDialog::getText(this,"New Record", "Your name");
        if(name.size()>0)
            table->insert(tab(diff,QPair<QString,int>(name, time)));
        if(h == 10){
 
            table->erase(table->find(temp));
        }
    }
    file->open(QIODevice::WriteOnly);
    for(auto& i : *table)
        file->write(i.second.first.toUtf8()+ " " + QString::number(i.second.second).toUtf8() + " " + QString::number(i.first).toUtf8() + "\n");
    file->close();
 
}

prog.cpp:2:14: error: ‘QPair’ does not name a type
 using  tab = QPair<difficult, QPair<QString,int>>;
              ^~~~~
prog.cpp:3:6: error: ‘multiset’ in namespace ‘std’ does not name a template type
 std::multiset<tab, std::function<bool(tab,tab)>>* table;
      ^~~~~~~~
prog.cpp:3:1: note: ‘std::multiset’ is defined in header ‘<set>’; did you forget to ‘#include <set>’?
prog.cpp:1:1:
+#include <set>
 enum difficult{EASY, MEDIUM, HARD};
prog.cpp:3:1:
 std::multiset<tab, std::function<bool(tab,tab)>>* table;
 ^~~
prog.cpp:4:1: error: ‘HighScores’ does not name a type
 HighScores::HighScores(QWidget *parent) :
 ^~~~~~~~~~
prog.cpp:29:1: error: ‘HighScores’ does not name a type
 HighScores::~HighScores()
 ^~~~~~~~~~
prog.cpp:34:6: error: ‘HighScores’ has not been declared
 void HighScores::callAddIf(difficult diff){
      ^~~~~~~~~~
prog.cpp: In function ‘void callAddIf(difficult)’:
prog.cpp:35:5: error: ‘emit’ was not declared in this scope
     emit gettime();
     ^~~~
prog.cpp:38:20: error: ‘table’ was not declared in this scope
     for(auto& i : *table)
                    ^~~~~
prog.cpp:38:20: note: suggested alternative: ‘mutable’
     for(auto& i : *table)
                    ^~~~~
                    mutable
prog.cpp:41:18: error: ‘table’ was not declared in this scope
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                  ^~~~~
prog.cpp:41:18: note: suggested alternative: ‘mutable’
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                  ^~~~~
                  mutable
prog.cpp:41:46: error: ‘QPair’ was not declared in this scope
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                                              ^~~~~
prog.cpp:41:52: error: ‘QString’ was not declared in this scope
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                                                    ^~~~~~~
prog.cpp:41:60: error: expected primary-expression before ‘int’
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                                                            ^~~
prog.cpp:41:37: error: ‘tab’ was not declared in this scope
     auto temp = *table->lower_bound(tab(diff,QPair<QString,int>("",0)));
                                     ^~~
prog.cpp:45:39: error: ‘time’ was not declared in this scope
     if(h < 10 || temp.second.second > time){
                                       ^~~~
prog.cpp:46:16: error: expected ‘;’ before ‘name’
         QString name = QInputDialog::getText(this,"New Record", "Your name");
                ^~~~~
                ;
prog.cpp:47:12: error: ‘name’ was not declared in this scope
         if(name.size()>0)
            ^~~~
prog.cpp:48:50: error: expected primary-expression before ‘int’
             table->insert(tab(diff,QPair<QString,int>(name, time)));
                                                  ^~~
prog.cpp:54:5: error: ‘file’ was not declared in this scope
     file->open(QIODevice::WriteOnly);
     ^~~~
prog.cpp:54:16: error: ‘QIODevice’ has not been declared
     file->open(QIODevice::WriteOnly);
                ^~~~~~~~~
prog.cpp:56:52: error: ‘QString’ is not a class, namespace, or enumeration
         file->write(i.second.first.toUtf8()+ " " + QString::number(i.second.second).toUtf8() + " " + QString::number(i.first).toUtf8() + "\n");
                                                    ^~~~~~~
prog.cpp:56:102: error: ‘QString’ is not a class, namespace, or enumeration
         file->write(i.second.first.toUtf8()+ " " + QString::number(i.second.second).toUtf8() + " " + QString::number(i.first).toUtf8() + "\n");
                                                                                                      ^~~~~~~

Standard output is empty