In solution files, each line represents one operation, either a retrieval or a relocation.
If only one number s is provided on a line, then this represents a retrieval
from stack s.
If two numbers s1 and s2 are provided on a line, then this represents a
relocation from stack s1 to stack s2.

File names are formatted as follows:
instance-algorithm_X_maxHeight=Y-Z.txt

Most algorithm names are self explanatory, DFBB is depth-first
branch-and-bound. X represents algorithms parameters, such as lower bound (lb),
upper bound (ub), condensation procedure (cp) or heuristic subroutine for the
pilot method (hub). Z is either 'trace' for files showing the execution trace
of a run, or 'sol' for files containing a solution.