The GLPK package is intended for solving linear
programming (LP) and mixed integer linear
programming (MIP) problems. It is a set of
routines organized in the form of a library and
written in the ANSI C programming language.
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The LP presolver is now used by default in the stand-alone program, and glpsol is provided to the lpx_simplex routine. The GLPK/L language now implements declarations of interval sets. There is also now a GLPK JNI Java interface.