Spheniscine's blog

By Spheniscine, history, 2 months ago, In English

A – Vanishing Pitch

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B – Remove It

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C – Digital Graffiti

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D – Circle Lattice Points

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E – Come Back Quickly

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F – GCD or MIN

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2 months ago, # |
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Spheniscine For problem F -> how is the rough bound O(M^(1/3)) ? I don't understand the maximum bound of D can someone explain ?

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    2 months ago, # ^ |
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    It's just a rough "rule of thumb", the exact values can be found on this page.

    The divisor function is hard to describe usefully in terms of big $$$O$$$, but it can be proven to always be $$$< 3.528 M ^ {1/3}$$$, which can be considered $$$O(M ^ {1/3})$$$

    In theoretical terms it's actually $$$O(M^\varepsilon)$$$ for all $$$\varepsilon > 0$$$, but it converges really slowly.

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2 months ago, # |
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Spheniscine can you explain why this submission has failed for problem D https://atcoder.jp/contests/abc191/submissions/20025093

I followed the editorial but it is still failing on test cases handmade_marginal_00.txt