Function problem_27

examples/99_problems.cpp:211–214

P27 (**) Group the elements of a set into disjoint subsets.

// P27 (**) Group the elements of a set into disjoint subsets.
void problem_27()
{
    // todo ;)
}

// P28 (**) Sorting a list of lists according to length of sublists
void problem_28()