diff --git a/lesson_4/exercise_1.cpp b/lesson_4/exercise_1.cpp
new file mode 100644
index 0000000..12ac4e7
--- /dev/null
+++ b/lesson_4/exercise_1.cpp
@@ -0,0 +1,79 @@
+/*
+ * exercise_1.cpp
+ *
+ *  Created on: 2 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#include <iostream>
+#include <vector>
+#include <random>
+#include <algorithm>
+#include <iterator>
+#include <list>
+
+#include "exercise_1.hpp"
+
+using namespace std;
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void generatorInt(TContainer<TItem, TIterator> &c, const unsigned int &i)
+{
+    random_device rd;
+    mt19937 mersenne(rd());
+    uniform_int_distribution<TItem> uid(-static_cast<TItem>(i), i);
+    generate(c.begin(), c.end(), [&]()
+    {
+        return uid(mersenne);
+    });
+}
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void generatorFloat(TContainer<TItem, TIterator> &c, const unsigned int &f)
+{
+    random_device rd;
+    mt19937 mersenne(rd());
+    uniform_real_distribution<TItem> urd(-static_cast<TItem>(f), static_cast<TItem>(f));
+    generate(c.begin(), c.end(), [&]()
+    {
+        return urd(mersenne);
+    });
+}
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void print(const TContainer<TItem, TIterator> &c)
+{
+    copy(c.begin(), c.end(), ostream_iterator<TItem> { cout, " " });
+    cout << endl;
+}
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void insert_sorted(TContainer<TItem, TIterator> &c, const TItem &i)
+{
+    typename TContainer<TItem, TIterator>::iterator it = find_if(c.begin(), c.end(), [&](const TItem &current)
+    {
+        return current >= i;
+    });
+    c.insert(it, i);
+}
+
+void exercise_1()
+{
+    const unsigned int size = 10;
+    int newIntValue = -3;
+    double newDoubleValue = 2.2;
+
+    vector<int> v(size);
+    generatorInt(v, size);
+    sort(v.begin(), v.end());
+    print(v);                             // -9 -9 -4 3 3 4 6 8 9 10
+    insert_sorted(v, newIntValue);
+    print(v);                             // -9 -9 -4 -3 3 3 4 6 8 9 10
+
+    list<double> l(size);
+    generatorFloat(l, size);
+    l.sort();
+    print(l);                             // -9.31992 -6.76971 -5.98545 -2.1297 -1.9722 -0.292701 0.715274 3.43089 4.35249 9.45377
+    insert_sorted(l, newDoubleValue);
+    print(l);                             // -9.31992 -6.76971 -5.98545 -2.1297 -1.9722 -0.292701 0.715274 2.2 3.43089 4.35249 9.45377
+}
diff --git a/lesson_4/exercise_1.hpp b/lesson_4/exercise_1.hpp
new file mode 100644
index 0000000..bde2d44
--- /dev/null
+++ b/lesson_4/exercise_1.hpp
@@ -0,0 +1,22 @@
+/*
+ * exercise_1.hpp
+ *
+ *  Created on: 2 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#pragma once
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void generatorInt(TContainer<TItem, TIterator> &c, const unsigned int &i);
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void generatorFloat(TContainer<TItem, TIterator> &c, const unsigned int &i);
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void print(const TContainer<TItem, TIterator> &c);
+
+template<template<typename, typename> class TContainer, typename TItem, typename TIterator>
+void insert_sorted(TContainer<TItem, TIterator> &c, const TItem &i);
+
+void exercise_1();
diff --git a/lesson_4/exercise_2.cpp b/lesson_4/exercise_2.cpp
new file mode 100644
index 0000000..d62614f
--- /dev/null
+++ b/lesson_4/exercise_2.cpp
@@ -0,0 +1,10 @@
+/*
+ * exercise_2.cpp
+ *
+ *  Created on: 2 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#include "exercise_2.hpp"
+
+
diff --git a/lesson_4/exercise_2.hpp b/lesson_4/exercise_2.hpp
new file mode 100644
index 0000000..b023320
--- /dev/null
+++ b/lesson_4/exercise_2.hpp
@@ -0,0 +1,8 @@
+/*
+ * exercise_2.hpp
+ *
+ *  Created on: 2 окт. 2021 г.
+ *      Author: alexander
+ */
+
+#pragma once
diff --git a/lesson_4/main.cpp b/lesson_4/main.cpp
index a4a0cf0..f0377c4 100644
--- a/lesson_4/main.cpp
+++ b/lesson_4/main.cpp
@@ -5,6 +5,12 @@
  *      Author: alexander
  */
 
+#include "exercise_1.hpp"
+#include "exercise_2.hpp"
 
+int main()
+{
+    exercise_1();
 
-
+    return 0;
+}