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use crate::shell_sort_gap_sequences::CIURA_2001 as gaps;
pub fn shell_sort<T: Ord>(mut a: Vec<T>) -> Vec<T> {
let n = a.len();
for &g in gaps.iter().rev() {
for i in g..n {
let mut j = i;
while j >= g {
if a[j - g] <= a[j] {
break;
}
a.swap(j - g, j);
j -= g;
}
}
}
a
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let cases = vec![
(vec![5, 2, 4, 6, 1, 3], vec![1, 2, 3, 4, 5, 6]),
(vec![1, 2, 3], vec![1, 2, 3]),
];
for (a, ans) in cases {
assert_eq!(shell_sort(a), ans);
}
}
}