Source: https://www.leandro-coelho.com/packing-circular-container/

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I. Instances
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There are 5 data files.

These data files are the test problems used in: 
A. Silva, L. C. Coelho, M. Darvish and J. Renaud (2021), A branch-and-cut and a parallel algorithm for packing two-dimensional rectangles in a circular container, submitted to EJOR. 

The test problems are the files:
rect30_S1, rect30_S2, rect30_S3, rect30_S4, rect30_S5. 

The format of the data files is:
number of rectangles (n), container radius
for rectangle i (i=1,2,...,n) in turn:
   rectangle_length rectangle_width

The dataset of Lopez and Besley (2018) is available at http://people.brunel.ac.uk/~mastjjb/jeb/orlib/files/
The dataset of Bouzid and Salhi (2020) is available at https://research.kent.ac.uk/clho/data-sets/#637-dataset
