The function list_ramps_b(m, n) is correct except when
m is zero. The simplest way to fix it is just to check whether
m is zero at the beginning, and return [[]]
in that case.
The function list_ramps_c(m, n) is also almost correct,
but it generates the list of ramps where the last entry is strictly
less than n, and we are supposed to allow for the last
entry to be equal to n. This can be fixed by changing
range(max([0]+L[i]), n) to
range(max([0]+L[i]), n+1).
The function list_ramps_d(m, n) generates the correct
set of ramps, but they do not come out listed in lexicographic
order. One could just use the function sorted() to
put them in the right order, but sorting is a moderately expensive
operation, so it is better to use a different algorithm that
produces the right order automatically.
Task 3: Cloning a repository
There are no solutions as such for this, but I am happy to answer
questions if you had trouble with it.