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ModBinomial

math

Struct ModBinomial 

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pub struct ModBinomial { /* private fields */ }
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Binomial-coefficient table modulo a prime modulo.

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impl ModBinomial

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pub fn new(max_n: usize, modulo: i64) -> Self

Build the table for all n in 0..=max_n. modulo must be prime (the common choice is 1_000_000_007 or 998_244_353).

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pub fn ncr(&self, n: usize, r: usize) -> i64

Compute nCr mod modulo. Returns 0 when r > n.

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