//matrix multiple

#include <iostream>
#include <vector>

int main()
{
    std::cout << "Enter rows amount of matrix 1: ";
    int row_matr_1;
    std::cin >> row_matr_1;
    std::cout << std::endl;

    std::cout << "Enter columns amount of matrix 1: ";
    int col_matr_1;
    std::cin >> col_matr_1;
    std::cout << std::endl;

    std::cout << "Row amount of matrix 2 is equal column amount for matrix 1: " << col_matr_1;
    int row_matr_2 = col_matr_1;
    std::cout << std::endl << std::endl;

    std::cout << "Enter column amount of matrix 2: ";
    int col_matr_2;
    std::cin >> col_matr_2;
    std::cout << std::endl;

    int first[row_matr_1][col_matr_1];
    int second[row_matr_2][col_matr_2];
    int result[row_matr_1][col_matr_2];

    std::cout << "Let's fill the matrix 1:" << std::endl;
    for (int i=0; i<row_matr_1; i++)
        for (int j=0; j<col_matr_1; j++)
        {
            std::cout << "Enter " << j << " item in " << i << " row: ";
            std::cin >> first[i][j];
        };

    std::cout << std::endl;

    std::cout << "Let's fill the matrix 2:" << std::endl;
    for (int i=0; i<row_matr_2; i++)
        for (int j=0; j<col_matr_2; j++)
        {
            std::cout << "Enter " << j << " item in " << i << " row: ";
            std::cin >> second[i][j];
        };

    std::cout << std::endl;

    for (int i=0; i<row_matr_1; i++)
        for (int j=0; j<col_matr_2; j++){
            result[i][j] = 0;
            for (int k=0; k<col_matr_1; k++)
                result[i][j] += first[i][k]*second[k][j];
        };

    std::cout << "The multiple result is:" << std::endl;

    for (int i=0; i<col_matr_1; i++){
        for (int j=0; j<col_matr_2; j++)
            std::cout << result[i][j] << " ";
        std::cout << std::endl;
    };
}