haar_lib::math::combinatorics::stirling_first_small_p

Struct StirlingFirstSmallP

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pub struct StirlingFirstSmallP { /* private fields */ }
Expand description

符号付き第一種スターリング数$s(n, k)$を計算する。

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impl StirlingFirstSmallP

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pub fn new(p: u64) -> Self

$\mod p$ ($p$は素数)で前計算をする。

Time complexity $O(p^2)$

Space complexity $O(p^2)$

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pub fn calc(&self, n: u64, k: u64) -> u64

$s(n, k)$を計算する。

Time complexity $O(1)$

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