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Update Immutable Vector #362

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17 changes: 9 additions & 8 deletions immutable_vec/README.md
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# Immutable Vector

Based on Clojure's [persistent vector](https://hypirion.com/musings/understanding-persistent-vector-pt-1).

Currently, only `push`, `set` and `get` are implemented, alongside with some iteration functions.

## TODO

- Add `insert` and `delete`.
- Support tail optimization.
Based on *RRB Vector: A Practical General Purpose Immutable Sequence, ICFP'15*.

It supports normal vector operations ($m$ is the branching factor and $n$ is the number of elements):
- Indexing in $O(\log_2{m} \cdot \log_m{n})$
- Updating in $O(m \cdot \log_m{n})$
- Removal in $O(m^2 \cdot \log_m{n})$
- Appending in $O(m \cdot \log_m{n})$
- Splitting in $O(m \cdot \log_m{n})$
- Concatenation in $O(m^2 \cdot \log_m{n})$