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pub fn get_both_indices<T>(vector: &mut Vec<T>, i: usize, j: usize) -> (&mut T, &mut T) {
    debug_assert_ne!(i, j);
    debug_assert!(i < vector.len());
    debug_assert!(j < vector.len());
    if i < j {
        let (first, last) = vector.split_at_mut(j);
        return (&mut first[i], &mut last[0])
    }
    else {
        let (first, last) = vector.split_at_mut(i);
        return (&mut last[0], &mut first[j])
    }
}