- PhD student working with Patrick Prosser and David Manlove in the Formal Analysis, Theory and Algorithms and Parallelism groups in the School of Computing Science at the University of Glasgow.
- Email: c.mccreesh.1 at research.gla.ac.uk
- Office: G161 Lilybank Gardens (enter through the Sir Alwyn Williams building, through the glass double doors, up half a flight of stairs, and along the twisty corridor; if you reach a few steps going downwards you've gone too far).

- Solving (NP) hard problems in practice, particularly combinatorial optimisation and graph theory problems.
- Symmetries in hard problems.
- Parallel search for branch and bound algorithms, and parallelism for intelligent backtracking search (such as conflict-directed backjumping).

Here's a scientific poster, and a three minute video of my thesis for a non-technical audience:

- Workshop on Teaching Constraint Programming at CP 2015.

- Ruth Hoffmann, Ciaran McCreesh and Craig Reilly:
**Between Subgraph Isomorphism and Maximum Common Subgraph**

To appear at AAAI 17

[Author-final PDF, Source code] - Ciaran McCreesh, Samba Ndojh Ndiaye, Patrick Prosser and Christine Solnon:
**Clique and Constraint Models for Maximum Common (Connected) Subgraph Problems**

CP 2016: 350-368.

[DOI, author-final PDF, Source code] - Ciaran McCreesh, Patrick Prosser and James Trimble:
**Morphing between Stable Matching Problems**

CP 2016: 832-840

[author-final PDF] - Ciaran McCreesh, Patrick Prosser and James Trimble:
**Heuristics and Really Hard Instances for Subgraph Isomorphism Problems.**

IJCAI 2016: 631-638.

[abstract and PDF, author-final PDF, Conference Talk (10 minutes), A0 Poster, Source code] - Ciaran McCreesh and Patrick Prosser:
**Finding Maximum k-Cliques Faster Using Lazy Global Domination.**

SoCS 2016: 72-80.

[abstract and PDF, author-final PDF, Older preprint on arXiv, Conference Talk, Source code] - Jose Cano Reyes, David White, Alejandro Bordallo, Ciaran McCreesh, Patrick Prosser, Jeremy Singer and
Vijay Nagarajan:
**Task Variant Allocation in Distributed Robotics.**

Robotics Science and Systems 2016.

[PDF, author-final PDF] - Lars Kotthoff, Ciaran McCreesh and Christine Solnon:
**Portfolios of Subgraph Isomorphism Algorithms.**

To appear at LION 2016.

[author-final PDF] - Ciaran McCreesh, Patrick Prosser:
**A Parallel, Backjumping Subgraph Isomorphism Algorithm using Supplemental Graphs.**

CP 2015: 295-312.

[DOI, author-final PDF, code, datasets, experimental scripts, VM for recomputation, conference presentation] - Craig Macdonald, Ciaran McCreesh, Alice Miller and Patrick Prosser:
**Constructing Sailing Match Race Schedules: Round-Robin Pairing Lists.**

CP 2015: 671-686

[DOI, author-final PDF, industry poster] - Ciaran McCreesh, Patrick Prosser:
**The Shape of the Search Tree for the Maximum Clique Problem, and the Implications for Parallel Branch and Bound.**

ACM Transactions on Parallel Computing Volume 2 Issue 1 (2015).

[DOI, ACM Author-izer PDF (if this link doesn't get you the paper for free, try prepending`www.`

to this page's URL, or email me), Older preprint on arXiv]. - Ciaran McCreesh, Patrick Prosser:
**A Parallel Branch and Bound Algorithm for the Maximum Labelled Clique Problem.**

Optimization Letters (2014)

[DOI (open access)]. - Ciaran McCreesh, Patrick Prosser:
**Reducing the Branching in a Branch and Bound Algorithm for the Maximum Clique Problem.**

CP 2014: 549-563

[DOI, author-final PDF] - Ciaran McCreesh, Patrick Prosser:
**An Exact Branch and Bound Algorithm with Symmetry Breaking for the Maximum Balanced Induced Biclique Problem.**

CPAIOR 2014: 226-234

[DOI, author-final PDF] - Ciaran McCreesh, Patrick Prosser:
**Multi-Threading a State-of-the-Art Maximum Clique Algorithm.**

Algorithms 6(4): 618-635 (2013)

[DOI (open access)]

- Solving Hard Graph Problems in Parallel, a general overview [source]
- Three minute talk from the CP 2015 doctoral program
- Ten minute talk from the Scottish Combinatorics Meeting on finding cliques in practice

- Solving Hard Subgraph Problems in Parallel, SICSA PhD Conference 2016. [source]
- Scheduling Match Races for Sailing, CP 2015 Industrial Day [source]
- Solving Hard Graph Problems in Parallel, SICSA PhD Conference 2015 (1st prize).
- Solving Hard Graph Problems in Parallel, second place at CP 2014. [source]
- Solving Hard Problems by Counting and Colouring Things In, for an industry event with a less-technical audience. [source]