Mapping HashMap value HashSet to BTreeMap value BTreeSet

help
1

I would like to write a function to convert from unordered to ordered collections with the types as follows:

fn hash_to_btree(hash: HashMap<i32, HashSet<i32>>) -> BTreeMap<i32, BTreeSet<i32>> {
  // ?
}

What is an idiomatic way to code this function?

2 
fn hash_to_btree(hash: HashMap<i32, HashSet<i32>>) -> BTreeMap<i32, BTreeSet<i32>> {
    hash.into_iter().map(|(k, v)| (k, v.into_iter().collect())).collect()
}
3

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