cppArr2DBigSmallSum

#include <iostream>
#include <chrono>

int main()
{
    srand(time(0));
    const int arrSizeY{ 5 };
    const int arrSizeXBig{ 10 };
    const int arrSizeXSmall{ arrSizeXBig / 2 };

    int arrBig[arrSizeY][arrSizeXBig]{ {1,2,3,4,5,6,7,8,9,10},{1,2,3,4,5,6,7,8,9,10},{1,2,3,4,5,6,7,8,9,10},{1,2,3,4,5,6,7,8,9,10},{1,2,3,4,5,6,7,8,9,10} };
    int arrSmall[arrSizeY][arrSizeXSmall]{ 0 };

    for (int y{ 0 }; y < arrSizeY; ++y)
    {
        for (int x{ 0 }; x < arrSizeXBig; ++x)
        {
            arrBig[y][x] = rand() % 10;
            std::cout << arrBig[y][x] << '\t';

        }
        std::cout << '\n';
    }
    std::cout << '\n';

    for (int y{ 0 }; y < arrSizeY; ++y)
    {
        for (int x{ 0 }; x < arrSizeXSmall; ++x)
        {
            arrSmall[y][x] = (arrBig[y][x * 2] + arrBig[y][x * 2 + 1]);
            std::cout << arrSmall[y][x] << '\t';
        }
        std::cout << '\n';
    }

    return 0;
}