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Important information regarding the instances.

An interesting paper regarding this problem can be found in :
Respen, J. and Zufferey, N. (2013). A Renault truck loading problem: form benchmarking to improvements. Proceedings of the 14th EU/ME Workshop, Hamburg, Germany. February 28 to March 1., pages 79–84.

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The first line of each file is of the following form:
camionW;X;Y;Z
where W is the truck ID, X the number of items, Y the length of the corresponding truck (in mm) and Z the corresponding width (in mm).

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Then, each item is caracterized by a line of the following form:
W;X;Y;Z
where W is the item number, X the class identifier, Y the length, and Z the width (in mm).
I.e.: 14;2;1200;1000 corresponds to item number 14, belonging to class 2, and having a size of 1200x1000

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I.e. camion1 is provided as an example:
camion1;23;13400;2440
0;0;1206;1010
1;0;1206;1010
2;0;1460;1060
3;0;1460;1060
4;0;1460;1060
5;0;1460;1060
6;0;1206;1010
7;0;1206;1010
8;0;1206;1010
9;0;1206;1010
10;0;1206;1010
11;0;1206;1010
12;0;1600;1200
13;0;1200;1000
14;0;1200;1000
15;0;1200;1000
16;0;1200;1000
17;0;1200;1000
18;0;1200;1000
19;0;1206;1010
20;0;1206;1010
21;0;1206;1010
22;0;1170;1000
Where the "camion1" instance contains 23 items, and the truck has a length of 13400 and a width of 2440, whereas item 0 belongs to class 0, and has a size of 1206x1010.
