cp_library_rs::number_theory::factorize_query

Struct FactorTable

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pub struct FactorTable {
    pub n: usize,
    pub sieve: Vec<usize>,
}
Expand description

前計算ありの素因数分解

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§n: usize§sieve: Vec<usize>

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impl FactorTable

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pub fn new(n: usize) -> Self

前計算を行う

  • $O(N \log\log N)$ 時間で篩を作成
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pub fn factorize(&self, x: usize) -> Vec<usize>

素因数分解を行い，素因数のベクタを返す

戻り値

  • 素因数のリスト

  • 時間計算量: $O(\log x)$

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pub fn factorize_pairs(&self, x: usize) -> Vec<(usize, usize)>

素因数分解を行い，(素因数, 指数) のベクタを返す

戻り値

  • (素因数, 指数) のベクタ

  • 時間計算量: $O(\log x)$

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