I guess the title says it all, here it the YT link. Of course, there was a post-contest stream by Neal Wu with the discussion of the solutions, but maybe you will find my explanations useful as well.
Educational Round 101 Livesolve [A-D]
I guess the title says it all, here it the YT link. Of course, there was a post-contest stream by Neal Wu with the discussion of the solutions, but maybe you will find my explanations useful as well.