Function convolution_and

pub fn convolution_and<T>(f: Vec<T>, g: Vec<T>) -> Vec<T>
where
    T: Copy + Add<Output = T> + Sub<Output = T> + Mul<Output = T>,

$\mathtt{a_{i \land j}} = \sum \mathtt{f_{i}} * \mathtt{g_{j}}$を満たすaを求める。