In Codeforces Round 791 (Div. 2):
In Codeforces Round 792 (Div. 1 + Div. 2):
In Educational Codeforces Round 129 (Rated for Div. 2):
In CodeCraft-22 and Codeforces Round 795 (Div. 2):
In Codeforces Round 796 (Div. 2):
I've been in poor status recently, and it may continue...