How is self-isolation treating you? I recently found this channel with a guy solving Sudoku-like puzzles. Had a lot of fun trying to solve puzzles for myself, and then watching the pro do it ten times faster while explaining everything. That reminded me I didn't upload to my Youtube for a while, and gave a good impression of how things look from the other side.

So here's me solving an old AtCoder Regular Contest for practice. From my experience I can recommend trying to solve problems yourself before watching me do it. Wasn't in particular hurry this time, trying to explain my thoughts as good as I can. Let me know what you think, and enjoy!