Codeforces

• 2020/12/17 Codeforces Round #690 (Div. 3)
• 2020/10/20 Codeforces Round #676 (Div. 2)
• 2020/10/18 Codeforces Raif Round 1 [Div.1 + Div.2]
• 2020/09/15 Counting with hashmaps