Function ceil_mul

poly-commit/src/utils.rs:37–39

(a: usize, b: (usize, usize))

/// ceil of a * b, where a is integer and b is a rational number
#[inline]
pub(crate) fn ceil_mul(a: usize, b: (usize, usize)) -> usize {
    (a * b.0 + b.1 - 1) / b.1
}

/// Return ceil(x / y).
pub(crate) fn ceil_div(x: usize, y: usize) -> usize {