diff --git a/task_01/first b/task_01/first
new file mode 100755
index 0000000..cf7b234
Binary files /dev/null and b/task_01/first differ
diff --git a/task_01/first.cpp b/task_01/first.cpp
new file mode 100644
index 0000000..3c851e9
--- /dev/null
+++ b/task_01/first.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+pair<int, int> func(int sum, const vector<int> &vec)
+{
+    int l = 0;
+    int r = vec.size() - 1;
+    while ((vec[r] + vec[l]) != sum and l < r)
+    {
+        if (vec[r] + vec[l] > sum)
+            r -= 1;
+        else
+            l += 1;
+    }
+    return make_pair(vec[l], vec[r]);
+}
+
+int main()
+{
+    vector<int> vec = {1, 2, 4, 5, 7};
+    pair<int, int> result = func(9, vec);
+    cout << result.first << " " << result.second;
+}
\ No newline at end of file
diff --git a/task_01/src/main.cpp b/task_01/src/main.cpp
index 0e4393b..e7bf54c 100644
--- a/task_01/src/main.cpp
+++ b/task_01/src/main.cpp
@@ -1,3 +1,12 @@
 #include <iostream>
+#include <vector>
+#include "util.hpp";
+using namespace std;
 
-int main() { return 0; }
+
+int main()
+{
+    vector<int> vec = {1, 2, 4, 5, 7};
+    pair<int, int> result = func(9, vec);
+    cout << result.first << " " << result.second;
+}
diff --git a/task_01/src/test.cpp b/task_01/src/test.cpp
index 87cef73..15bbf0f 100644
--- a/task_01/src/test.cpp
+++ b/task_01/src/test.cpp
@@ -1,5 +1,45 @@
 #include <gtest/gtest.h>
+#include <cmath>
+#include <util.hpp>
+
+
+TEST(Test1_Simple_Test, Simple) {
+    std::vector<int> v = {1, 2, 3, 4, 5, 6};
+    
+    auto result = func(7, v);
+    EXPECT_EQ(result.first, 1);
+    EXPECT_EQ(result.second, 6);
+}
+
+TEST(Test2, Empty) {
+    std::vector<int> v = {};
+    
+    auto result = func(7, v);
+    EXPECT_EQ(result.first, 0);
+    EXPECT_EQ(result.second, 0);
+}
+
+TEST(Test3, Small) {
+    std::vector<int> v = {5};
+    
+    auto result = func(7, v);
+    EXPECT_EQ(result.first, 0);
+    EXPECT_EQ(result.second, 0);
+}
+
+TEST(Test4, No_Pair) {
+    std::vector<int> v = {1, 3, 5, 7};
+    
+    auto result = func(40, v);
+    EXPECT_EQ(result.first, -1);
+    EXPECT_EQ(result.second, -1);
+}
+ 
+TEST(Test5, With_Negative) {
+    std::vector<int> v = {-1, 3, -4, 8};   
+    auto result = func(-5, v);
+    EXPECT_EQ(result.first, -1);
+    EXPECT_EQ(result.second, -4);
+}
+
 
-TEST(Test, Simple) {
-  ASSERT_EQ(1, 1);  // Stack []
-}
\ No newline at end of file
diff --git a/task_01/src/util.hpp b/task_01/src/util.hpp
new file mode 100644
index 0000000..3edea03
--- /dev/null
+++ b/task_01/src/util.hpp
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <iostream>
+#include <vector>
+using namespace std;
+
+pair<int, int> func(int sum, const vector<int> &vec)
+{
+    if (vec.size() < 2)
+        return make_pair(0, 0);
+    int l = 0;
+    int r = vec.size() - 1;
+    while (l < r)
+    {
+        if (vec[r] + vec[l] == sum)
+            return make_pair(vec[l], vec[r]);
+        if (vec[r] + vec[l] > sum)
+            r -= 1;
+        else
+            l += 1;
+    }
+    return make_pair(-1, -1);
+}
+
diff --git a/task_03/src/util.hpp b/task_03/src/util.hpp
new file mode 100644
index 0000000..6655cac
--- /dev/null
+++ b/task_03/src/util.hpp
@@ -0,0 +1,31 @@
+#include<map>
+#include<vector>
+#include<string>
+using namespace std;
+
+vector<string> get_komb_letters(const string& num)
+map<int, char> button;
+button[1] = {};
+button[2] = {'a', 'b', 'c'};
+button[3] = {'d', 'e', 'f'};
+button[4] = {'g', 'h', 'i'};
+button[5] = {'j', 'k', 'l'};
+button[6] = {'m', 'n', 'o'};
+button[7] = {'p', 'q', 'r', 's'};
+button[8] = {'t', 'u', 'v'};
+button[9] = {'w', 'x', 'y', 'z'};
+button[0] = {'+'}
+
+vector<string> res;
+
+for(int i = 0; i < len(button[num[0]]); i++){
+    for (int j = 0; j < len(button[num[1]]); j++){
+        s = button[num[0]][i] + button[num[1]][j];
+        res
+
+    }
+   
+}
+
+
+