Re: [Help-glpk] ILP problem , unexpected solution

[Andrew Makhorin]

I run your code with a call to glp_write_lp added.
Below here is your instance passed to glp_simplex in cplex format:

\* Problem: sample *\

Maximize
 obj: 0 x1

Subject To
 p: + x4 + x3 + x2 + x1 <= 5
 q: - x2 + 10 x1 <= 5
 r: - 2 x3 + x2 <= 5
 o: - 0.5 x4 + 2 x3 = 1

Bounds
 0 <= x1 <= 1
 0 <= x2 <= 1
 0 <= x3 <= 1
 0 <= x4 <= 1

Generals
 x1
 x2
 x3
 x4

End