# RSPR version history

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## 1.2.1

- Bugfix release
- fixed crash bug that affected some systems/configurations

## 1.2.0

- Significant new speed improvements that do improve the complexity to O(2^k n).
- See
*Supertrees based on the subtree prune-and-regraft distance*and*Computing the SPR Distance of Binary Rooted Trees in O(2^k n) Time*for more details

## 1.1.1

- Bugfix release
- Fixed a coding error that rarely reported one more than the SPR distance

## 1.1.0

- Significant speed improvements that we believe improve the complexity to O(2^k n).
- The second tree can now be multifurcating.
- Added -simple_unrooted option that can be used with -total to quickly compute a good rooting of the second tree based on a bipartition balanced accuracy measure.

## 1.03

- Bugfix release
- The approximate distance is now output when the cluster reduction is enabled.
- The correct approximate distance is output.
- The -fpt option (without the -cluster_test cluster reduction option) now correctly outputs "exact drSPR=X" instead of "exact BB drSPR=x".

## 1.02

- Includes a cluster reduction step that greatly improves performance in many cases.
- Provides an option to find the total rooted SPR distance between the first input tree and each of the remaining input trees.
- Stand-alone version of the calculations used in
*"Subtree Prune-and-Regraft Supertrees."*

## 1.01

- Optimized branching cases, improving the complexity to O(2.42^k n), where k is the rooted SPR distance and n is the number of leaves.
- Version used in
*"Fast FPT Algorithms for Computing Rooted Agreement Forests: Theory and Experiments."*

## 1.00

- initial program version.
- Computes a 3-approximation of the rooted SPR distance between each pair of input trees.
- Computes the exact rooted SPR distance with complexity O(3^k n), where k is the rooted SPR distance and n is the number of leaves.
- Option to compute the smallest rooted SPR distance between the first input tree and each of the remaining input trees, to approximate the unrooted SPR distance.
- Version used in
*"A Unifying View on Approximation and FPT of Agreement Forests."*