Codeforces Round 672 (Div2) Solutions to A-E

Solutions available at the end of the video. I compete in CF Round 672, which is available here: https://codeforces.com/contest/1420/standings/friends/true. Timestamps: 0:00 Good morning! 0:15 Problem A 2:44 Problem B 7:00 Problem C 13:53 Problem C2 20:00 Problem D 35:38 Thinking about Problem E 1:27:57 Problem A Solution 1:30:12 Problem B Solution 1:32:57 Problem C1 and C2 Solution 1:37:46 Problem D Solution 1:42:16 Problem E n^5 idea