I'm currently live discussing the problems. I will add problemwise timestamp after the discussion stream, and also format the blog properly.
You can join in if something in this blog is unclear or you have more questions.
Idea
My submission — 285842091
2025B - Binomial Coefficients, Kind Of
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Hint 3
My submission — 285848201
Solution 1: Hint
Solution 2: Hint
My submission — 285852480
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Hint 6
My submission — 285868260
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Bonus
My submission — 285892958
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Hint 7
My submission — 285887128
thanks for editorial... :)
Great blog!
Problem E indeed can be solved in $$$m\log{m}\log{n}$$$ using convolution with binary exponentiation. code
So cool ! FFT... Nice.
Nice hints for D.