Uploaded March 2020 | Updated September 2026, 2 days ago

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Ended up 21th by the end of the contest. Update: It changed to 20th
I solved C and D too slowly and I made several stupid mistakes in all problems. The slow servers on CF also made it a bit worse :(

Explanations video is here: youtube.com/watch?v=qSgbhBu7Ttw

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