Erofeev V. HW1

homework/Erofeev/01/sum_by_columns.cpp

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+#include <chrono>
+#include <iostream>
+
+using ll = long long;
+
+const int SIZE = 10000;
+int matrix[SIZE][SIZE];
+volatile ll sum = 0;
+
+class Timer
+{
+    using clock_t = std::chrono::high_resolution_clock;
+    using microseconds = std::chrono::microseconds;
+public:
+    Timer()
+        : start_(clock_t::now())
+    {
+    }
+
+    ~Timer()
+    {
+        const auto finish = clock_t::now();
+        const auto us = 
+            std::chrono::duration_cast<microseconds>
+                (finish - start_).count();
+        std::cout << us << std::endl;
+    }
+
+private:
+    const clock_t::time_point start_;
+};
+
+int main() {
+    for (int i = 0; i < SIZE; i++) 
+        for (int j = 0; j < SIZE; j++) 
+            matrix[j][i] = i + j;
+
+    Timer t;
+    sum = 0;
+    for (int i = 0; i < SIZE; i++)
+        for (int j = 0; j < SIZE; j++)
+            sum += matrix[j][i];    
+}

homework/Erofeev/01/sum_by_columns.out

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homework/Erofeev/01/sum_by_rows.cpp

@@ -0,0 +1,44 @@
+#include <chrono>
+#include <iostream>
+
+using ll = long long;
+
+const int SIZE = 10000;
+int matrix[SIZE][SIZE];
+ll sum = 0;
+
+
+class Timer
+{
+    using clock_t = std::chrono::high_resolution_clock;
+    using microseconds = std::chrono::microseconds;
+public:
+    Timer()
+        : start_(clock_t::now())
+    {
+    }
+
+    ~Timer()
+    {
+        const auto finish = clock_t::now();
+        const auto us = 
+            std::chrono::duration_cast<microseconds>
+                (finish - start_).count();
+        std::cout << us << std::endl;
+    }
+
+private:
+    const clock_t::time_point start_;
+};
+
+int main() {
+    for (int i = 0; i < SIZE; i++) 
+        for (int j = 0; j < SIZE; j++) 
+            matrix[i][j] = i + j;
+
+    Timer t;
+    sum = 0;
+    for (int i = 0; i < SIZE; i++)
+        for (int j = 0; j < SIZE; j++)
+            sum += matrix[i][j];           
+}

homework/Erofeev/01/sum_by_rows.out

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