Hello, I've made a video-editorial for problem F from yesterday's contest, but if the constraints were much higher. As I use Diophantine equations there, I've decided to make a separate short video about them. So here they are both:

https://www.youtube.com/watch?v=Yn5GAoGHTsM

https://www.youtube.com/watch?v=IDmDg6PoVug

Thanks the developers for a cool contest!