задача про шахматную доску(функции и ссылки)

#include <iostream>
#include <cmath>
 
/**
 * Counts numbers of fields of a rectangular chessboard of given height and width in cells,
 * assuming that it is colored in two uniformly changing colors.
 * <p/>
 * Result contains two values, first value is a count of cells colored as first cell,
 * second value is count of cells colored in other color.
 *
 * @param height height of board in cells
 * @param width width of board in cells
 * @return a pair of unsigned integers, representing two counts of colors
 */
std::pair<unsigned, unsigned> countFieldsOnBlackboard(unsigned height, unsigned width) {
    double half = (width * height) / 2.;
    return { std::ceil(half), std::floor(half)};
}
 
int main() {
    int height = 3;
    int width = 4;
 
    auto count = countFieldsOnBlackboard(height, width);
 
    std::cout << "On chessboard of size " << height << "x" << width << ": "
        << "black fields count is " << count.first << ", "
        << "white fields count is " << count.second << std::endl;
    return 0;
}

std::pair<unsigned, unsigned> countFieldsOnBlackboard(unsigned height, unsigned width) {
    unsigned total = width * height;
    unsigned half = total / 2;
    return { total - half, half };
}

#include <iostream>
 
struct A {
uint a,b;
A(uint n)
{
    uint i(n*n>>1),j(n*n>>1);
    if (n%2) ++i;
    a=i,b=j;
}};
 
int main()
{
    A C(8);
    std::cout << C.a<<" "<< C.b<<"\n";
    return 0;
}