#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let mut v = [-5i32, 4, 1, -3, 2];
    let (lesser, median, greater) = v.select_nth_unstable_by_key(2, |a| a.abs());
    assert!(lesser == [1, 2] || lesser == [2, 1]);
    assert_eq!(median, & mut - 3);
    assert!(greater == [4, - 5] || greater == [- 5, 4]);
    assert!(
        v == [1, 2, - 3, 4, - 5] || v == [1, 2, - 3, - 5, 4] || v == [2, 1, - 3, 4, - 5]
        || v == [2, 1, - 3, - 5, 4]
    );
}