                 Changes in version 2.0.2 (2026-09-02)                  

  - Fix segfault in RSPRDist().

                 Changes in version 2.0.1 (2026-07-21)                  

  - Check for interrupts during calls to USPRDist() & RSPRDist().

                 Changes in version 2.0.0 (2026-03-30)                  

  - Add RSPRDist() for rooted Subtree Prune-and-Regraft (rSPR)
    distances, wrapping the exact FPT algorithm (with cluster
    decomposition) of Whidden, Beiko & Zeh (2013). Supports exact
    distances, a linear-time 3-approximation, and maximum agreement
    forest output.
  - Improve performance of USPRDist() by replacing string-based tree
    representation in the A* search with 256-bit integer tree numbers
    (Tromp encoding), giving O(1) equality and hash lookup.
  - Add exact SPR distance lookup tables for trees with 4–9 leaves,
    eliminating A* search for small trees and subtrees encountered
    during reduction.
  - Improve performance of USPRDist() A* search by replacing the
    multiset-based priority queue (pointer-chasing red-black tree) with
    a binary min-heap (priority_queue over a contiguous vector), giving
    better cache behaviour for queue operations.
  - Reduce heap allocations in normalize_order() by replacing per-node
    map<int,unode*> with a 3-element inline array sort.
  - Reduce heap allocations in TBR/replug branch-and-bound search by
    replacing list<unode*> neighbour storage with fixed-capacity inline
    arrays, replacing list/map book-keeping containers with
    vector/unordered_map, and allocating tree nodes from a block arena
    instead of individual new/delete.

                 Changes in version 1.0.3 (2025-11-28)                  

  - Match updated CRAN policy.

                 Changes in version 1.0.2 (2020-09-17)                  

  - Import RdMacros package 'Rdpack'.

                 Changes in version 1.0.1 (2020-07-07)                  

  - Address memory mismanagement in USPRDist().

                 Changes in version 1.0.0 (2020-07-01)                  

  - Initial implementation of distances on unrooted trees.
