I participated in Codeforces Round 898 (Div. 4) and, surprisingly, solved all problems.
You can watch the solutions (please, not during the contest!):
Screencast & Editorial of Codeforces Round 898 (Div. 4)
I participated in Codeforces Round 898 (Div. 4) and, surprisingly, solved all problems.
You can watch the solutions (please, not during the contest!):