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