AtCoder Regular Contest 223

Screencast of ARC 223. I solved A, B, C. For D I tried coming up with some stuff, but didn't manage to get anything full. Also sorry about having to mess with compile commands at beginning. My Debug template explanation:    • Explaining My Debug Template   Timestamps: 0:00 Start 2:04 Contest Start, Problem A 15:33 Problem B 36:15 Break after solving B 45:17 Problem C 1:17:22 Problem D (unsolved) 1:58:09 Ending Ramblings