commit b6337e60153d8eb2145aa375ae73c9d5c257717e
Author: Dmitry Rudakov <redshieldsoft@gmail.com>
Date:   Fri Jun 5 22:19:50 2026 +0500

    Upload to git

diff --git a/algo.h b/algo.h
new file mode 100644
index 0000000..a7c454a
--- /dev/null
+++ b/algo.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <deque>
+
+template<class T, class Comp>
+std::deque<T> Merge(const std::deque<T>& half1, const std::deque<T>& half2, const Comp& comparator) {
+    std::deque<T> result;
+    auto it1 = half1.begin();
+    auto it2 = half2.begin();
+
+    while (it1 != half1.end() && it2 != half2.end()) {
+        if (!comparator(*it2, *it1)) {
+            result.push_back(*it1);
+            ++it1;
+        } else {
+            result.push_back(*it2);
+            ++it2;
+        }
+    }
+
+    while (it1 != half1.end()) {
+        result.push_back(*it1);
+        ++it1;
+    }
+
+    while (it2 != half2.end()) {
+        result.push_back(*it2);
+        ++it2;
+    }
+
+    return result;
+}
+
+template<class T, class Comp>
+std::deque<T> MergeSort(const std::deque<T>& src, const Comp& comparator) {
+    if (src.size() <= 1) {
+        return src;
+    }
+
+    const size_t mid = src.size() / 2;
+    const auto mid_it = std::next(src.begin(), mid);
+
+    const auto left = MergeSort(
+        std::deque<T>(src.begin(), mid_it),
+        comparator
+    );
+    const auto right = MergeSort(
+        std::deque<T>(mid_it, src.end()),
+        comparator
+    );
+
+    return Merge(left, right, comparator);
+}
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..fd3e533
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,11 @@
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}
diff --git a/mainwindow.cpp b/mainwindow.cpp
new file mode 100644
index 0000000..2f71d94
--- /dev/null
+++ b/mainwindow.cpp
@@ -0,0 +1,345 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+#include "algo.h"
+
+#include <QMessageBox>
+#include <QSignalBlocker>
+
+#include <algorithm>
+
+bool CaseInsensitiveLess(const std::string& lhs, const std::string& rhs) {
+    return QString::compare(
+        QString::fromStdString(lhs),
+        QString::fromStdString(rhs),
+        Qt::CaseInsensitive
+    ) < 0;
+}
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+    , m_random_gen_(std::random_device{}()) {
+    ui->setupUi(this);
+
+    ApplyModel();
+}
+
+MainWindow::~MainWindow() {
+    delete ui;
+}
+
+void MainWindow::ApplyModel() {
+    const auto it_tmp = deque_model_.iterator;
+    const QSignalBlocker blocker(ui->list_widget);
+
+    ui->list_widget->clear();
+
+    for (size_t i = 0; i < deque_model_.items.size(); ++i) {
+        ui->list_widget->addItem(
+            QString::fromStdString(std::to_string(i) + ": " + deque_model_.items[i])
+        );
+    }
+
+    ui->list_widget->addItem("end");
+
+    deque_model_.iterator = it_tmp;
+
+    ui->txt_size->setText(QString::number(deque_model_.items.size()));
+
+    const bool is_empty = deque_model_.items.empty();
+    ui->btn_pop_back->setDisabled(is_empty);
+    ui->btn_pop_front->setDisabled(is_empty);
+    ui->btn_erase->setDisabled(is_empty);
+
+    ApplyIterator();
+}
+
+void MainWindow::ApplyIterator() {
+    const QSignalBlocker blocker(ui->list_widget);
+
+    if (deque_model_.items.empty()) {
+        ui->list_widget->setCurrentRow(0);
+        ui->txt_elem_content->clear();
+        ui->btn_edit->setDisabled(true);
+        ui->btn_erase->setDisabled(true);
+        ui->btn_inc_iterator->setDisabled(true);
+        ui->btn_dec_iterator->setDisabled(true);
+        return;
+    }
+
+    const auto distance = std::distance(deque_model_.items.begin(), deque_model_.iterator);
+    const bool is_end = deque_model_.iterator == deque_model_.items.end();
+    const bool is_begin = deque_model_.iterator == deque_model_.items.begin();
+
+    ui->list_widget->setCurrentRow(static_cast<int>(distance));
+    ui->btn_edit->setDisabled(is_end);
+    ui->btn_erase->setDisabled(is_end);
+    ui->btn_inc_iterator->setDisabled(is_end);
+    ui->btn_dec_iterator->setDisabled(is_begin);
+
+    if (is_end) {
+        ui->txt_elem_content->clear();
+    } else {
+        ui->txt_elem_content->setText(QString::fromStdString(*deque_model_.iterator));
+    }
+}
+
+void MainWindow::SetRandomGen(const std::mt19937& random_gen) {
+    m_random_gen_ = random_gen;
+}
+
+void MainWindow::on_btn_clear_clicked() {
+    deque_model_.items.clear();
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_push_front_clicked() {
+    deque_model_.items.push_front(ui->txt_elem_content->text().toStdString());
+
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_push_back_clicked() {
+    deque_model_.items.push_back(ui->txt_elem_content->text().toStdString());
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_pop_back_clicked() {
+    if (deque_model_.items.empty()) {
+        return;
+    }
+
+    deque_model_.items.pop_back();
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_pop_front_clicked() {
+    if (deque_model_.items.empty()) {
+        return;
+    }
+
+    deque_model_.items.pop_front();
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_insert_clicked() {
+    deque_model_.items.insert(
+        deque_model_.iterator,
+        ui->txt_elem_content->text().toStdString()
+    );
+
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_erase_clicked() {
+    if (deque_model_.iterator == deque_model_.items.end()) {
+        return;
+    }
+
+    deque_model_.items.erase(deque_model_.iterator);
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_begin_clicked() {
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_end_clicked() {
+    deque_model_.iterator = deque_model_.items.end();
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_dec_iterator_clicked() {
+    if (deque_model_.iterator != deque_model_.items.begin()) {
+        --deque_model_.iterator;
+    }
+
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_inc_iterator_clicked() {
+    if (deque_model_.iterator != deque_model_.items.end()) {
+        ++deque_model_.iterator;
+    }
+
+    ApplyIterator();
+}
+
+void MainWindow::on_list_widget_currentRowChanged(int currentRow) {
+    currentRow = std::clamp(currentRow, 0, static_cast<int>(deque_model_.items.size()));
+    deque_model_.iterator = deque_model_.items.begin() + currentRow;
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_tea_clicked() {
+    static std::deque<std::string> tea {
+        "Чай Лунцзин",
+        "Эрл Грей",
+        "Сенча",
+        "Пуэр",
+        "Дарджилинг",
+        "Ассам",
+        "Матча",
+        "Ганпаудер",
+        "Оолонг",
+        "Лапсанг Сушонг"
+    };
+
+    deque_model_.items = tea;
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_cakes_clicked() {
+    static std::deque<std::string> cakes {
+        "Красный бархат",
+        "Наполеон",
+        "Медовик",
+        "Тирамису",
+        "Прага",
+        "Чизкейк",
+        "Захер",
+        "Эстерхази",
+        "Морковный торт",
+        "Чёрный лес",
+    };
+    deque_model_.items = cakes;
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_edit_clicked() {
+    if (deque_model_.iterator == deque_model_.items.end()) {
+        return;
+    }
+
+    *deque_model_.iterator = ui->txt_elem_content->text().toStdString();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_resize_clicked() {
+    bool ok = false;
+    const int size = ui->txt_size->text().toInt(&ok);
+
+    if (!ok || size < 0 || size > 1000) {
+        QMessageBox::warning(this, "Error", "Incorrect size");
+        return;
+    }
+
+    deque_model_.items.resize(static_cast<size_t>(size));
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_find_clicked() {
+    deque_model_.iterator = std::find(
+        deque_model_.items.begin(),
+        deque_model_.items.end(),
+        ui->txt_elem_content->text().toStdString()
+    );
+
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_count_clicked() {
+    const int count = static_cast<int>(std::count(
+        deque_model_.items.begin(),
+        deque_model_.items.end(),
+        ui->le_count->text().toStdString()
+    ));
+
+    ui->lbl_count->setText(QString::number(count));
+}
+
+void MainWindow::on_btn_min_element_clicked() {
+    deque_model_.iterator = std::min_element(
+        deque_model_.items.begin(),
+        deque_model_.items.end()
+    );
+
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_max_element_clicked() {
+    deque_model_.iterator = std::max_element(
+        deque_model_.items.begin(),
+        deque_model_.items.end()
+    );
+
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_sort_clicked() {
+    deque_model_.items = MergeSort(
+        deque_model_.items,
+        [](const std::string& lhs, const std::string& rhs) {
+            return lhs < rhs;
+        }
+    );
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_sOrT_clicked() {
+    deque_model_.items = MergeSort(deque_model_.items, CaseInsensitiveLess);
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_shuffle_clicked() {
+    std::shuffle(deque_model_.items.begin(), deque_model_.items.end(), m_random_gen_);
+    ApplyModel();
+}
+
+void MainWindow::on_btn_unique_clicked() {
+    if (!std::is_sorted(deque_model_.items.begin(), deque_model_.items.end())) {
+        ApplyIterator();
+        return;
+    }
+
+    const auto new_end = std::unique(deque_model_.items.begin(), deque_model_.items.end());
+    deque_model_.items.erase(new_end, deque_model_.items.end());
+    deque_model_.iterator = deque_model_.items.begin();
+    ApplyModel();
+}
+
+void MainWindow::on_btn_reverse_clicked() {
+    std::reverse(deque_model_.items.begin(), deque_model_.items.end());
+    ApplyModel();
+}
+
+void MainWindow::on_btn_lower_bound_clicked() { if (!std::is_sorted(deque_model_.items.begin(), deque_model_.items.end())) {
+        return;
+    }
+
+    deque_model_.iterator = std::lower_bound(
+        deque_model_.items.begin(),
+        deque_model_.items.end(),
+        ui->txt_elem_content->text().toStdString()
+    );
+
+    ApplyIterator();
+}
+
+void MainWindow::on_btn_upper_bound_clicked() {
+    if (!std::is_sorted(deque_model_.items.begin(), deque_model_.items.end())) {
+        return;
+    }
+
+    deque_model_.iterator = std::upper_bound(
+        deque_model_.items.begin(),
+        deque_model_.items.end(),
+        ui->txt_elem_content->text().toStdString()
+    );
+
+    ApplyIterator();
+}
diff --git a/mainwindow.h b/mainwindow.h
new file mode 100644
index 0000000..ecd320a
--- /dev/null
+++ b/mainwindow.h
@@ -0,0 +1,87 @@
+#pragma once
+
+#include <QMainWindow>
+
+#include <random>
+
+#include "model.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+    void SetRandomGen(const std::mt19937& random_gen);
+
+private slots:
+    // Очистить список
+    void on_btn_clear_clicked();
+    // Добавить элеменит в начало списка
+    void on_btn_push_front_clicked();
+    // Добавить элемент в конец списка
+    void on_btn_push_back_clicked();
+    // Удалить элемент из начала списка
+    void on_btn_pop_front_clicked();
+    // Удалить элемент из конца списка
+    void on_btn_pop_back_clicked();
+    // Вставить элемент в список на определенную позицию
+    void on_btn_insert_clicked();
+    // Удалить выбранный элемент
+    void on_btn_erase_clicked();
+    // Перейти в начало списка
+    void on_btn_begin_clicked();
+    // Перейти в конец списка
+    void on_btn_end_clicked();
+    // Перейти на пердыдущий элемент
+    void on_btn_dec_iterator_clicked();
+    // Перейти на следующий элемент списка
+    void on_btn_inc_iterator_clicked();
+    // Событие обновляет список после изменения
+    void on_list_widget_currentRowChanged(int currentRow);
+    // Заполнение списка стандарными элементами (чай, торт)
+    void on_btn_tea_clicked();
+    void on_btn_cakes_clicked();
+
+    // Изменить элемент списка
+    void on_btn_edit_clicked();
+    // Изменить количество элементов в списке
+    void on_btn_resize_clicked();
+    // Найти элемент в списке
+    void on_btn_find_clicked();
+    // Отобразить количество элементов в спике
+    void on_btn_count_clicked();
+    // Перейти к минимальному элементу
+    void on_btn_min_element_clicked();
+    // Перейти к максимаьному элементу
+    void on_btn_max_element_clicked();
+    // Сортировать список
+    void on_btn_sort_clicked();
+    // Сортировать список
+    void on_btn_sOrT_clicked();
+    // Применить рандомный
+    void on_btn_shuffle_clicked();
+    // Удалить повторящиеся элементы
+    void on_btn_unique_clicked();
+    // Перевернуть массив
+    void on_btn_reverse_clicked();
+    // Поиск элементов меньше и больше заданного значения
+    void on_btn_lower_bound_clicked();
+    void on_btn_upper_bound_clicked();
+
+private:
+    // Выводит на экран элементы списка с 0, устанавливает размер списка
+    void ApplyModel();
+    // Выводит текущее полжение итератора, информацию об элементе
+    void ApplyIterator();
+
+private:
+    Model deque_model_;
+    Ui::MainWindow *ui;
+    std::mt19937 m_random_gen_;
+};
diff --git a/mainwindow.ui b/mainwindow.ui
new file mode 100644
index 0000000..1fb121d
--- /dev/null
+++ b/mainwindow.ui
@@ -0,0 +1,478 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>600</width>
+    <height>648</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>std::deque demo</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <widget class="QWidget" name="layoutWidget">
+    <property name="geometry">
+     <rect>
+      <x>10</x>
+      <y>10</y>
+      <width>581</width>
+      <height>631</height>
+     </rect>
+    </property>
+    <layout class="QHBoxLayout" name="horizontalLayout_3">
+     <item>
+      <widget class="QListWidget" name="list_widget"/>
+     </item>
+     <item>
+      <layout class="QVBoxLayout" name="verticalLayout">
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout">
+         <item>
+          <widget class="QLineEdit" name="txt_elem_content">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btn_edit">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>Edit</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btn_find">
+           <property name="text">
+            <string>find</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_5">
+         <item>
+          <widget class="QLineEdit" name="le_count"/>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btn_count">
+           <property name="text">
+            <string>count</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLabel" name="lbl_count">
+           <property name="text">
+            <string>0</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <layout class="QFormLayout" name="formLayout">
+         <item row="3" column="0">
+          <widget class="QPushButton" name="btn_pop_back">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>pop_back</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="1">
+          <widget class="QPushButton" name="btn_push_back">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>push_back</string>
+           </property>
+          </widget>
+         </item>
+         <item row="4" column="0">
+          <widget class="QPushButton" name="btn_erase">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>erase</string>
+           </property>
+          </widget>
+         </item>
+         <item row="4" column="1">
+          <widget class="QPushButton" name="btn_insert">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="layoutDirection">
+            <enum>Qt::LayoutDirection::LeftToRight</enum>
+           </property>
+           <property name="text">
+            <string>insert</string>
+           </property>
+          </widget>
+         </item>
+         <item row="13" column="0">
+          <widget class="QPushButton" name="btn_dec_iterator">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>--</string>
+           </property>
+          </widget>
+         </item>
+         <item row="13" column="1">
+          <widget class="QPushButton" name="btn_inc_iterator">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>++</string>
+           </property>
+          </widget>
+         </item>
+         <item row="14" column="0">
+          <widget class="QPushButton" name="btn_begin">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>begin</string>
+           </property>
+          </widget>
+         </item>
+         <item row="14" column="1">
+          <widget class="QPushButton" name="btn_end">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>end</string>
+           </property>
+          </widget>
+         </item>
+         <item row="16" column="0">
+          <widget class="QPushButton" name="btn_tea">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>= чай</string>
+           </property>
+          </widget>
+         </item>
+         <item row="16" column="1">
+          <widget class="QPushButton" name="btn_cakes">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>= торты</string>
+           </property>
+          </widget>
+         </item>
+         <item row="0" column="0" colspan="2">
+          <widget class="QLabel" name="label">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>Методы</string>
+           </property>
+          </widget>
+         </item>
+         <item row="12" column="0" colspan="2">
+          <widget class="QLabel" name="label_4">
+           <property name="text">
+            <string>Итератор</string>
+           </property>
+          </widget>
+         </item>
+         <item row="15" column="0" colspan="2">
+          <widget class="QLabel" name="label_2">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>Заготовки</string>
+           </property>
+          </widget>
+         </item>
+         <item row="5" column="0" colspan="2">
+          <widget class="QPushButton" name="btn_clear">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>clear</string>
+           </property>
+          </widget>
+         </item>
+         <item row="6" column="0">
+          <widget class="QLabel" name="label_6">
+           <property name="text">
+            <string>Алгоритмы</string>
+           </property>
+          </widget>
+         </item>
+         <item row="7" column="0">
+          <widget class="QPushButton" name="btn_min_element">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>min_element</string>
+           </property>
+          </widget>
+         </item>
+         <item row="7" column="1">
+          <widget class="QPushButton" name="btn_max_element">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>max_element</string>
+           </property>
+          </widget>
+         </item>
+         <item row="8" column="0">
+          <widget class="QPushButton" name="btn_sort">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>merge sort</string>
+           </property>
+          </widget>
+         </item>
+         <item row="8" column="1">
+          <widget class="QPushButton" name="btn_sOrT">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>merge sOrT</string>
+           </property>
+          </widget>
+         </item>
+         <item row="9" column="0">
+          <widget class="QPushButton" name="btn_shuffle">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>shuffle</string>
+           </property>
+          </widget>
+         </item>
+         <item row="9" column="1">
+          <widget class="QPushButton" name="btn_unique">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>unique</string>
+           </property>
+          </widget>
+         </item>
+         <item row="10" column="0">
+          <widget class="QPushButton" name="btn_reverse">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>reverse</string>
+           </property>
+          </widget>
+         </item>
+         <item row="2" column="0">
+          <widget class="QPushButton" name="btn_pop_front">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>pop_front</string>
+           </property>
+          </widget>
+         </item>
+         <item row="2" column="1">
+          <widget class="QPushButton" name="btn_push_front">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>push_front</string>
+           </property>
+          </widget>
+         </item>
+         <item row="11" column="0">
+          <widget class="QPushButton" name="btn_lower_bound">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>lower_bound</string>
+           </property>
+          </widget>
+         </item>
+         <item row="11" column="1">
+          <widget class="QPushButton" name="btn_upper_bound">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>upper_bound</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Orientation::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_4"/>
+       </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <item>
+          <widget class="QLabel" name="label_3">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+           <property name="text">
+            <string>size():</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLineEdit" name="txt_size">
+           <property name="sizePolicy">
+            <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+             <horstretch>0</horstretch>
+             <verstretch>0</verstretch>
+            </sizepolicy>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QPushButton" name="btn_resize">
+           <property name="text">
+            <string>resize</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </widget>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>
diff --git a/model.h b/model.h
new file mode 100644
index 0000000..941b04a
--- /dev/null
+++ b/model.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <vector>
+#include <string>
+#include <random>
+#include <deque>
+
+struct Model {
+    using Deque = std::deque<std::string>;
+    Deque items;
+    Deque::iterator iterator = items.begin();
+};
diff --git a/submission.pro b/submission.pro
new file mode 100644
index 0000000..b9c3804
--- /dev/null
+++ b/submission.pro
@@ -0,0 +1,24 @@
+########
+MOCK_LIB=../../../../mocks_library
+########
+
+QT += core gui widgets
+
+CONFIG += c++20
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    algo.h \
+    mainwindow.h \
+    model.h
+
+FORMS += \
+    mainwindow.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target