function show_the_solution(result)
    imshow(1-result,'InitialMagnification','fit')
    hold on
    u=[0 9];
    for i=0.5:1:8.5
        v=[i i];
        line(u,v,'color','k')
    end
    v=[0 9];
    for i=0.5:1:8.5
        u=[i i];
        line(u,v,'color','k')
    end
end