AtCoder Beginner Contest #320 - ABCDE solutions with explanations!

Incredibly educational problems on AtCoder, especially problem G that we didn't solve, but read the editorial on after the contest ended. Timestamps: 0:00 Intro 1:04 Problem A 1:54 Problem B 8:09 Problem C 18:08 Problem D 27:45 Problem E 36:15 Problem F&G 1:28:08 Explanations