multiply.cpp

#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <chrono>
#include <iomanip>
#include <filesystem>
#include <iomanip>

using namespace std;
using namespace chrono;
namespace fs = std::filesystem;

using Matrix = vector<vector<int>>;

Matrix readCSVMatrix(const string& filename, int size) {
    ifstream file(filename);
    Matrix mat(size, vector<int>(size));
    string line;
    for (int i = 0; i < size && getline(file, line); ++i) {
        stringstream ss(line);
        string value;
        for (int j = 0; j < size && getline(ss, value, ','); ++j)
            mat[i][j] = stoi(value);
    }
    return mat;
}

void writeCSVMatrix(const string& filename, const Matrix& mat) {
    ofstream file(filename);
    for (const auto& row : mat) {
        for (size_t j = 0; j < row.size(); ++j) {
            file << row[j];
            if (j != row.size() - 1) file << ",";
        }
        file << "\n";
    }
}

Matrix multiply(const Matrix& A, const Matrix& B, int size) {
    Matrix C(size, vector<int>(size, 0));
    for (int i = 0; i < size; ++i)
        for (int j = 0; j < size; ++j)
            for (int k = 0; k < size; ++k)
                C[i][j] += A[i][k] * B[k][j];
    return C;
}

int main() {
    fs::create_directory("results");
    ofstream benchmark("results/benchmark.csv");
    benchmark << "Size,Time_ms\n";

    Matrix fullA = readCSVMatrix("matrices/matrix_A.csv", 1000);
    Matrix fullB = readCSVMatrix("matrices/matrix_B.csv", 1000);

    for (int size = 100; size <= 1000; size += 100) {
        Matrix A(size, vector<int>(size));
        Matrix B(size, vector<int>(size));
        for (int i = 0; i < size; ++i)
            for (int j = 0; j < size; ++j) {
                A[i][j] = fullA[i][j];
                B[i][j] = fullB[i][j];
            }

        auto start = high_resolution_clock::now();
        Matrix C = multiply(A, B, size);
        auto end = high_resolution_clock::now();

        double duration = duration_cast<microseconds>(end - start).count() / 1000.0;

        benchmark << size << "," << fixed << setprecision(3) << duration << "\n";

        string dir_name = "results/" + to_string(size) + "x" + to_string(size);
        fs::create_directory(dir_name);

        writeCSVMatrix(dir_name + "/result.csv", C);

        ofstream timefile(dir_name + "/time.txt");
        timefile << "Размер: " << size << "x" << size << "\n";
        timefile << "Объём задачи: " << size * size << " элементов\n";
        timefile << "Время выполнения: " << fixed << setprecision(3) << duration << " мс\n";
        timefile.close();

        cout << "📏 Размер: " << setw(9) << right << (to_string(size) + "x" + to_string(size))
             << " | ⏱ Время: " << setw(10) << fixed << setprecision(3) << duration << " мс"
             << endl;
    }

    benchmark.close();
    return 0;
}