diff --git a/.clang-tidy b/.clang-tidy
index 4f16b6456..6a0bbde4b 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -13,7 +13,6 @@ Checks: >
   readability-*,
   -bugprone-casting-through-void,
   -bugprone-easily-swappable-parameters,
-  -bugprone-implicit-widening-of-multiplication-result,
   -cppcoreguidelines-avoid-magic-numbers,
   -cppcoreguidelines-non-private-member-variables-in-classes,
   -cppcoreguidelines-owning-memory,
diff --git a/tasks/all/example/func_tests/main.cpp b/tasks/all/example/func_tests/main.cpp
index b506003ab..cc74607f0 100644
--- a/tasks/all/example/func_tests/main.cpp
+++ b/tasks/all/example/func_tests/main.cpp
@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include <cstddef>
 #include <cstdint>
 #include <stb_library.hpp>
 #include <string>
@@ -15,7 +16,7 @@ class NesterovATestTaskAll : public ::testing::TestWithParam<int> {
     std::string abs_path = ppc::util::GetAbsolutePath("all/example/data/pic_all.jpg");
     data = stbi_load(abs_path.c_str(), &width, &height, &channels, 0);
     ASSERT_TRUE(data != nullptr) << "Failed to load image: " << stbi_failure_reason();
-    img = std::vector<uint8_t>(data, data + (width * height * channels));
+    img = std::vector<uint8_t>(data, data + (static_cast<size_t>(width) * height * channels));
     stbi_image_free(data);
 
     ASSERT_EQ(width, height);
@@ -28,10 +29,10 @@ class NesterovATestTaskAll : public ::testing::TestWithParam<int> {
 
 TEST_P(NesterovATestTaskAll, MatmulFromPic) {
   int divider = GetParam();
-  const int k_count = (width + height) / divider;
+  const size_t k_count = (width + height) / divider;
 
   std::vector<int> in(k_count * k_count, 0);
-  for (int i = 0; i < k_count; i++) {
+  for (size_t i = 0; i < k_count; i++) {
     in[(i * k_count) + i] = 1;
   }
 
@@ -45,10 +46,10 @@ TEST_P(NesterovATestTaskAll, MatmulFromPic) {
 
 TEST_P(NesterovATestTaskAll, MatMulUtilFromPic) {
   int divider = GetParam();
-  const int k_count = (width + height) / divider;
+  const size_t k_count = (width + height) / divider;
 
   std::vector<int> in(k_count * k_count, 0);
-  for (int i = 0; i < k_count; i++) {
+  for (size_t i = 0; i < k_count; i++) {
     in[(i * k_count) + i] = 1;
   }
   std::vector<int> out(k_count * k_count, 0);
@@ -59,10 +60,10 @@ TEST_P(NesterovATestTaskAll, MatMulUtilFromPic) {
 
 TEST_P(NesterovATestTaskAll, MatMulTBBUtilFromPic) {
   int divider = GetParam();
-  const int k_count = (width + height) / divider;
+  const size_t k_count = (width + height) / divider;
 
   std::vector<int> in(k_count * k_count, 0);
-  for (int i = 0; i < k_count; i++) {
+  for (size_t i = 0; i < k_count; i++) {
     in[(i * k_count) + i] = 1;
   }
   std::vector<int> out(k_count * k_count, 0);
diff --git a/tasks/all/example/perf_tests/main.cpp b/tasks/all/example/perf_tests/main.cpp
index 8c84f284e..226b57fb8 100644
--- a/tasks/all/example/perf_tests/main.cpp
+++ b/tasks/all/example/perf_tests/main.cpp
@@ -2,6 +2,7 @@
 #include <mpi.h>
 
 #include <chrono>
+#include <cstddef>
 #include <memory>
 #include <vector>
 
@@ -11,12 +12,12 @@
 
 class NesterovAllRunTest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
-  static constexpr int kCount = 400;
+  static constexpr size_t kCount = 400;
   std::vector<int> input_data;
 
   void SetUp() override {
     input_data.assign(kCount * kCount, 0);
-    for (int i = 0; i < kCount; ++i) {
+    for (size_t i = 0; i < kCount; ++i) {
       input_data[(i * kCount) + i] = 1;
     }
   }
diff --git a/tasks/mpi/example/perf_tests/main.cpp b/tasks/mpi/example/perf_tests/main.cpp
index 336b661bf..ec70c79df 100644
--- a/tasks/mpi/example/perf_tests/main.cpp
+++ b/tasks/mpi/example/perf_tests/main.cpp
@@ -14,7 +14,7 @@
 class NesterovATaskMPITest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
   static void RunTest(ppc::core::PerfResults::TypeOfRunning mode) {
-    constexpr int kCount = 500;
+    constexpr size_t kCount = 500;
 
     // Create data
     std::vector<int> in(kCount * kCount, 0);
diff --git a/tasks/omp/example/perf_tests/main.cpp b/tasks/omp/example/perf_tests/main.cpp
index 6097e0c35..7b2db214e 100644
--- a/tasks/omp/example/perf_tests/main.cpp
+++ b/tasks/omp/example/perf_tests/main.cpp
@@ -13,7 +13,7 @@
 class NesterovTaskOMPTest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
   static void RunTest(ppc::core::PerfResults::TypeOfRunning mode) {
-    constexpr int kCount = 300;
+    constexpr size_t kCount = 300;
 
     // Create data
     std::vector<int> in(kCount * kCount, 0);
diff --git a/tasks/seq/example/perf_tests/main.cpp b/tasks/seq/example/perf_tests/main.cpp
index 58462f01a..cfc12fc06 100644
--- a/tasks/seq/example/perf_tests/main.cpp
+++ b/tasks/seq/example/perf_tests/main.cpp
@@ -13,7 +13,7 @@
 class NesterovTaskSeqTest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
   static void RunTest(ppc::core::PerfResults::TypeOfRunning mode) {
-    constexpr int kCount = 500;
+    constexpr size_t kCount = 500;
 
     // Create data
     std::vector<int> in(kCount * kCount, 0);
diff --git a/tasks/stl/example/perf_tests/main.cpp b/tasks/stl/example/perf_tests/main.cpp
index fd8197c08..176aa8fcf 100644
--- a/tasks/stl/example/perf_tests/main.cpp
+++ b/tasks/stl/example/perf_tests/main.cpp
@@ -13,7 +13,7 @@
 class NesterovTaskSTLTest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
   static void RunTest(ppc::core::PerfResults::TypeOfRunning mode) {
-    constexpr int kCount = 450;
+    constexpr size_t kCount = 450;
 
     // Create data
     std::vector<int> in(kCount * kCount, 0);
diff --git a/tasks/tbb/example/perf_tests/main.cpp b/tasks/tbb/example/perf_tests/main.cpp
index cf80fe29d..ea5c00b55 100644
--- a/tasks/tbb/example/perf_tests/main.cpp
+++ b/tasks/tbb/example/perf_tests/main.cpp
@@ -13,7 +13,7 @@
 class NesterovTaskTBBTest : public ::testing::TestWithParam<ppc::core::PerfResults::TypeOfRunning> {
  protected:
   static void RunTest(ppc::core::PerfResults::TypeOfRunning mode) {
-    constexpr int kCount = 450;
+    constexpr size_t kCount = 450;
 
     // Create data
     std::vector<int> in(kCount * kCount, 0);