Submitter Variables Constraints Density Status Group Objective MPS File
A. Caprara, M. Fischetti, P. Toth 15293 2539 4.57749e-03 easy core 689 core2536-691.mps.gz

Set covering instance coming from Italian railway models

Imported from MIPLIB2010.

Instance Statistics

Detailed explanation of the following tables can be found here.

Size Related Properties
Original Presolved
Variables 15293 15278
Constraints 2539 2505
Binaries 15284 15278
Integers 0 0
Continuous 9 0
Implicit Integers 0 0
Fixed Variables 0 0
Nonzero Density 0.00457749 0.00417727
Nonzeroes 177739 159870
Constraint Classification Properties
Original Presolved
Total 2539 2505
Empty 0 0
Free 0 0
Singleton 5 0
Aggregations 0 0
Precedence 0 0
Variable Bound 4 1
Set Partitioning 0 0
Set Packing 0 0
Set Covering 2527 2503
Cardinality 0 0
Invariant Knapsack 1 1
Equation Knapsack 0 0
Bin Packing 0 0
Knapsack 0 0
Integer Knapsack 0 0
Mixed Binary 2 0
General Linear 0 0
Indicator 0 0

Structure

Available nonzero structure and decomposition information. Further information can be found here.

value min median mean max
Components 0.301030
Constraint % 0.0399202 0.0399202 0.0399202 0.0399202
Variable % 0.0130864 0.0130864 0.0130864 0.0130864
Score 0.000399

Best Known Solution(s)

Find solutions below. Download the archive containing all solutions from the Download page.

ID Objective Exact Int. Viol Cons. Viol Obj. Viol Submitter Date Description
2 689 689 0 0 0 - 2018-10-29 Solution found during MIPLIB2017 problem selection.
1 689 689 0 0 0 - 2018-10-13 Solution imported from MIPLIB2010.

Similar instances in collection

The following instances are most similar to core2536-691 in the collection. This similarity analysis is based on 100 scaled instance features describing properties of the variables, objective function, bounds, constraints, and right hand sides.

Instance Variables Binaries Integers Continuous Constraints Nonz. Submitter Group Status Objective
core4284-1064 21714 21705 0 9 4287 245121 A. Caprara, M. Fischetti, P. Toth core open 1067*
core4872-1529 24656 24645 0 11 4875 218762 A. Caprara, M. Fischetti, P. Toth core open 1537*
core2586-950 13226 13215 0 11 2589 104678 A. Caprara, M. Fischetti, P. Toth core open 950*
rail507 63019 63009 0 10 509 468878 A. Caprara, M. Fischetti, P. Toth easy 174
fast0507 63009 63009 0 0 507 409349 MIPLIB submission pool easy 174

Reference

@article{CapraraFischettiToth1999,
 author = {A. Caprara and M. Fischetti and P. Toth},
 instance = {core4872-1529},
 journal = {Operations Research},
 language = {English},
 pages = {730--743},
 title = {A heuristic method for the set covering problem},
 volume = {47},
 year = {1999}
}

Last Update Nov 09, 2018 by Gregor Hendel
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