I'm announcing a new series called: Lets Upsolve! In this series I will choose some codeforces round and upsolve problems A-D, then explain my solutions. I reccomend that everyone tries the problems on their own at first, then if you get stuck, you can view my video. If you're reading this blog this is a great opportunity to upsolve some problems instead of making excuses;)

Lets Upsolve! — Episode 1: Codeforces Educational Round 125 A-D