homework_01

homework/Savchenko/01/Timer.hpp

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+
+#ifndef sum_by_rows_hpp
+#define sum_by_rows_hpp
+
+#include <chrono>
+#include <iostream>
+
+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 << " us" << std::endl;
+    }
+
+private:
+    const clock_t::time_point start_;
+};
+
+#endif /* sum_by_rows_hpp */

homework/Savchenko/01/sum_by_col.cpp

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+#include "Timer.hpp"
+#include <iostream>
+
+#define N 998
+
+int sum_by_col()
+{
+    int arr[N][N];
+    for (int i = 0; i < N; i++)
+        for (int j = 0; j < N; j++)
+            arr[i][j] = (i + j) % 100;
+
+    Timer timer;
+
+    int sum = 0;
+    for (int i = 0; i < N; i++)
+        for (int j = 0; j < N; j++)
+            sum += arr[j][i];
+
+    return sum;
+
+}
+
+int main()
+{
+    std::cout << sum_by_col() << std::endl;
+}

homework/Savchenko/01/sum_by_rows.cpp

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+#include "Timer.hpp"
+#include <iostream>
+
+#define N 998
+
+int sum_by_rows()
+{
+    int arr[N][N];
+    for (int i = 0; i < N; i++)
+        for (int j = 0; j < N; j++)
+            arr[i][j] = (i + j) % 100;
+
+    Timer timer;
+
+    int sum = 0;
+    for (int i = 0; i < N; i++)
+        for (int j = 0; j < N; j++)
+            sum += arr[i][j];
+
+    return sum;
+
+}
+
+int main()
+{
+    std::cout << sum_by_rows() << std::endl;
+}