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#![allow(unused)] | |
fn reorder<T: Clone>(values: Vec<T>, indices: Vec<usize>) -> Vec<Option<(usize, T)>> { | |
let mut pairs: Vec<_> = indices.iter().zip(values).collect(); | |
pairs.sort_by_key(|v| v.0); | |
let mut iter = pairs.iter().peekable(); | |
(0..*pairs.last().unwrap().0 + 1) | |
.map(|i| match iter.peek() { | |
Some((j, _)) => { | |
if i == **j { | |
Some((i, iter.next().unwrap().1.clone())) | |
} else { | |
None | |
} | |
} | |
None => None, | |
}) | |
.collect() | |
} | |
#[test] | |
fn reorder_all_indices() { | |
let values = vec!["C", "D", "E", "F", "G", "H"]; | |
let indices = vec![3, 0, 4, 1, 2, 5]; | |
let mut reordered = reorder(values, indices); | |
assert_eq!(Some((0, "D")), reordered[0]); | |
assert_eq!(Some((1, "F")), reordered[1]); | |
assert_eq!(Some((2, "G")), reordered[2]); | |
assert_eq!(Some((3, "C")), reordered[3]); | |
assert_eq!(Some((4, "E")), reordered[4]); | |
assert_eq!(Some((5, "H")), reordered[5]); | |
} | |
#[test] | |
fn reorder_missing_indices() { | |
let values = vec!["C", "D", "E", "F"]; | |
let indices = vec![4, 0, 1, 5]; | |
let mut reordered = reorder(values, indices); | |
println!("{:?}", reordered); | |
assert_eq!(Some((0, "D")), reordered[0]); | |
assert_eq!(Some((1, "E")), reordered[1]); | |
assert_eq!(None, reordered[2]); | |
assert_eq!(None, reordered[3]); | |
assert_eq!(Some((4, "C")), reordered[4]); | |
assert_eq!(Some((5, "F")), reordered[5]); | |
} |
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