Added a few more videos to my playlist:
- Round 883 (Div. 3)
- Round 886 (Div. 4)
I think the solutions are quite intuitive (and hope they are well-explained), check them out. Also keep an eye out for more solution videos.
https://www.youtube.com/playlist?list=PLMSo_-spVQ_9YunnChdhx8uMUTEW4bkO3