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int GetPresolvedProblem(CPXENVptr env,
        string problemfilename,
        string solutionfilename,
        CPXLPptr &presolvedproblem,
        vector<double> &presolvedsolution,
        double &presolvetime)
{

    int status;
    vector<double> originalsolution;
    double originalobjective;
    double starttime;
    double endtime;
    CPXLPptr temppresolvedproblem;

    CPXLPptr tmpproblem = CPXcreateprob(env, &status, "TmpProblem");
    assert(!status);

    status = CPXreadcopyprob(env, tmpproblem, problemfilename.c_str(), NULL);
    assert(!status);

    status = ReadSolution(solutionfilename,
            originalsolution,
            originalobjective);
    assert(!status);

    assert(!CPXgettime(env, &starttime));
    status = CPXpresolve(env, tmpproblem, CPX_ALG_NONE);
    assert(!status);
    assert(!CPXgettime(env, &endtime));

    presolvetime = endtime - starttime;

    status = CPXgetredlp(env, tmpproblem, &tmppresolvedproblem);
    assert(!status);

    presolvedproblem = CPXcloneprob(env, tmppresolvedproblem, &status);
    assert(!status);

    presolvedsolution.resize(CPXgetnumcols(env, presolvedproblem));

    status = CPXcrushx(env, tmpproblem, &(originalsolution[0]), 
            &(presolvedsolution[0]));

    status = CPXfreeprob(env, tmpproblem);
    assert(!status);

    return 0;
}