Looking through some of these URLs through Google cache, a lot of these contain verbatim copies of the problem text. Fair enough, legally speaking, if you are the copyright holder.
However, in the DMCA itself HackerRank asks for the removal of entire repositories, claiming "the whole repository is infringing copyright as it contains the solution". This is a blatant lie, HackerRank is not an automatic copyright holder of any solutions to a problem they published.
However, in the DMCA itself HackerRank asks for the removal of entire repositories, claiming "the whole repository is infringing copyright as it contains the solution". This is a blatant lie, HackerRank is not an automatic copyright holder of any solutions to a problem they published.