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Added a few more videos to my playlist:
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
My first programming video, showing solutions I made in this round.
It's possible one or two of them are not completely optimized but I think these approaches are intuitive.
The description contains a text document which I used to guide this video. The document also contains my CF submissions for the problems.
