My screencast of https://atcoder.jp/contests/m-solutio...
Solutions are available at the end.
Timestamps, because they have been heavily suggested:
0:00 - Contest start
0:33 - Problem A
2:24 - Problem B
4:30 - Problem C
10:30 - Problem D
16:55 - Problem E
1:39:22 - Solution to Problem A
1:41:10 - Solution to Problem B
1:42:05 - Solution to Problem C
1:43:53 - Solution to Problem D
1:46:00 - Solution to Problem E + Frustrations at getting java'd