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pardon110 的个人博客
/// Calculate the differences between elements of `values` offset by `offset`,
/// wrapping around from the end of `values` to the beginning.
///
/// Element `n` of the result is `values[(n+offset)%len] - values[n]`.
fn offset_differences<N>(offset: usize, values: Vec<N>) -> Vec<N>
where
N: Copy + std::ops::Sub<Output = N>,
{
// let len = values.len();
// values
// .iter()
// .enumerate()
// .map(|(idx, &v)| values[(offset + idx) % len] - v)
// .collect::<Vec<N>>()
let a = (&values).into_iter();
let b = (&values).into_iter().cycle().skip(offset);
a.zip(b).map(|(a, b)|
*b -*a
).take(values.len()).collect()
}本作品采用《CC 协议》，转载必须注明作者和本文链接
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