From d0badc2cebb87401fa876d79f16ec8be0277f3f0 Mon Sep 17 00:00:00 2001
From: Ermakov Alexei <lioshaermakov32@gmail.com>
Date: Sun, 12 Apr 2026 15:48:42 +0300
Subject: [PATCH 1/3] fix tests

---
 .../tests/functional/main.cpp                      | 14 +++++++++++++-
 .../tests/performance/main.cpp                     | 12 ++++++++----
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/tasks/ermakov_a_spar_mat_mult/tests/functional/main.cpp b/tasks/ermakov_a_spar_mat_mult/tests/functional/main.cpp
index 75d82d66d..d073e0fb0 100644
--- a/tasks/ermakov_a_spar_mat_mult/tests/functional/main.cpp
+++ b/tasks/ermakov_a_spar_mat_mult/tests/functional/main.cpp
@@ -4,6 +4,7 @@
 #include <cmath>
 #include <complex>
 #include <cstddef>
+#include <cstdint>
 #include <random>
 #include <string>
 #include <tuple>
@@ -101,6 +102,17 @@ void FillRandom(DenseMatrix &a, DenseMatrix &b, int n, double density, std::mt19
   }
 }
 
+std::uint32_t MakeSeed(int n, const std::string &desc) {
+  std::uint32_t seed = 2166136261U;
+  for (unsigned char ch : desc) {
+    seed ^= ch;
+    seed *= 16777619U;
+  }
+  seed ^= static_cast<std::uint32_t>(n);
+  seed *= 16777619U;
+  return seed;
+}
+
 MatrixCRS DenseToCRS(const DenseMatrix &m, double eps = 1e-12) {
   MatrixCRS r;
 
@@ -179,7 +191,7 @@ class ErmakovARunFuncTestSparMatMult : public ppc::util::BaseRunFuncTests<InType
       }
       FillFixed(a, b);
     } else {
-      std::mt19937 gen(std::random_device{}());
+      std::mt19937 gen(MakeSeed(n, desc));
       const double density = ResolveDensity(desc);
       FillRandom(a, b, n, density, gen);
     }
diff --git a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
index 19610b0f4..c174312c2 100644
--- a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
+++ b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
@@ -3,6 +3,7 @@
 #include <cmath>
 #include <complex>
 #include <cstddef>
+#include <cstdint>
 #include <random>
 #include <vector>
 
@@ -19,10 +20,13 @@ namespace {
 
 using DenseMatrix = std::vector<std::vector<std::complex<double>>>;
 
-DenseMatrix MakeRandomDense(int n, double density) {
+constexpr std::uint32_t kPerfSeedA = 0x13579BDFU;
+constexpr std::uint32_t kPerfSeedB = 0x2468ACE0U;
+
+DenseMatrix MakeRandomDense(int n, double density, std::uint32_t seed) {
   DenseMatrix m(n, std::vector<std::complex<double>>(n, {0.0, 0.0}));
 
-  std::mt19937 gen(std::random_device{}());
+  std::mt19937 gen(seed);
   std::uniform_real_distribution<double> dis_val(-5.0, 5.0);
   std::uniform_real_distribution<double> dis_prob(0.0, 1.0);
 
@@ -71,8 +75,8 @@ class ErmakovARunPerfTestSparMatMult : public ppc::util::BaseRunPerfTests<InType
   void SetUp() override {
     const double density = 0.001;
 
-    auto a_dense = MakeRandomDense(k_count, density);
-    auto b_dense = MakeRandomDense(k_count, density);
+    auto a_dense = MakeRandomDense(k_count, density, kPerfSeedA);
+    auto b_dense = MakeRandomDense(k_count, density, kPerfSeedB);
 
     input_data.A = DenseToCRS(a_dense);
     input_data.B = DenseToCRS(b_dense);

From 08b870b35fb4a19fc9dd3495d463af4ad866f97e Mon Sep 17 00:00:00 2001
From: Ermakov Alexei <lioshaermakov32@gmail.com>
Date: Wed, 15 Apr 2026 23:37:15 +0300
Subject: [PATCH 2/3] fix performance/main.cpp

---
 .../tests/performance/main.cpp                | 49 +++++--------------
 1 file changed, 11 insertions(+), 38 deletions(-)

diff --git a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
index c174312c2..3e032d0a4 100644
--- a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
+++ b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
@@ -1,6 +1,5 @@
 #include <gtest/gtest.h>
 
-#include <cmath>
 #include <complex>
 #include <cstddef>
 #include <cstdint>
@@ -18,14 +17,14 @@ namespace ermakov_a_spar_mat_mult {
 
 namespace {
 
-using DenseMatrix = std::vector<std::vector<std::complex<double>>>;
-
 constexpr std::uint32_t kPerfSeedA = 0x13579BDFU;
 constexpr std::uint32_t kPerfSeedB = 0x2468ACE0U;
 
-DenseMatrix MakeRandomDense(int n, double density, std::uint32_t seed) {
-  DenseMatrix m(n, std::vector<std::complex<double>>(n, {0.0, 0.0}));
-
+MatrixCRS MakeRandomCRS(int n, double density, std::uint32_t seed) {
+  MatrixCRS matrix;
+  matrix.rows = n;
+  matrix.cols = n;
+  matrix.row_ptr.resize(static_cast<std::size_t>(n) + 1ULL, 0);
   std::mt19937 gen(seed);
   std::uniform_real_distribution<double> dis_val(-5.0, 5.0);
   std::uniform_real_distribution<double> dis_prob(0.0, 1.0);
@@ -33,36 +32,13 @@ DenseMatrix MakeRandomDense(int n, double density, std::uint32_t seed) {
   for (int i = 0; i < n; ++i) {
     for (int j = 0; j < n; ++j) {
       if (dis_prob(gen) < density) {
-        m[i][j] = {dis_val(gen), dis_val(gen)};
-      }
-    }
-  }
-  return m;
-}
-
-MatrixCRS DenseToCRS(const DenseMatrix &m, double eps = 1e-12) {
-  MatrixCRS r;
-
-  const int rows = static_cast<int>(m.size());
-  const int cols = (rows != 0) ? static_cast<int>(m[0].size()) : 0;
-
-  r.rows = rows;
-  r.cols = cols;
-  r.row_ptr.resize(rows + 1);
-  r.row_ptr[0] = 0;
-
-  for (int i = 0; i < rows; ++i) {
-    for (int j = 0; j < cols; ++j) {
-      const auto v = m[i][j];
-      if (std::abs(v.real()) > eps || std::abs(v.imag()) > eps) {
-        r.values.push_back(v);
-        r.col_index.push_back(j);
+        matrix.values.emplace_back(dis_val(gen), dis_val(gen));
+        matrix.col_index.push_back(j);
       }
     }
-    r.row_ptr[i + 1] = static_cast<int>(r.values.size());
+    matrix.row_ptr[static_cast<std::size_t>(i) + 1ULL] = static_cast<int>(matrix.values.size());
   }
-
-  return r;
+  return matrix;
 }
 
 }  // namespace
@@ -75,11 +51,8 @@ class ErmakovARunPerfTestSparMatMult : public ppc::util::BaseRunPerfTests<InType
   void SetUp() override {
     const double density = 0.001;
 
-    auto a_dense = MakeRandomDense(k_count, density, kPerfSeedA);
-    auto b_dense = MakeRandomDense(k_count, density, kPerfSeedB);
-
-    input_data.A = DenseToCRS(a_dense);
-    input_data.B = DenseToCRS(b_dense);
+    input_data.A = MakeRandomCRS(k_count, density, kPerfSeedA);
+    input_data.B = MakeRandomCRS(k_count, density, kPerfSeedB);
   }
 
   bool CheckTestOutputData(OutType &output_data) final {

From 35bd015e5839c3cf9ad8002556aae1b55abb8ef1 Mon Sep 17 00:00:00 2001
From: Ermakov Alexei <lioshaermakov32@gmail.com>
Date: Sun, 19 Apr 2026 19:16:21 +0300
Subject: [PATCH 3/3] fix clang-tidy

---
 tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
index 3e032d0a4..30d01a8ae 100644
--- a/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
+++ b/tasks/ermakov_a_spar_mat_mult/tests/performance/main.cpp
@@ -1,6 +1,5 @@
 #include <gtest/gtest.h>
 
-#include <complex>
 #include <cstddef>
 #include <cstdint>
 #include <random>