ampl - presolved in MILP -

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presolve: rows , columns removed iteration objective primal inf. dual inf. time 0 9.9086144e-01 0.000000e+00 0.000000e+00 0s 16 9.9086144e-01 0.000000e+00 0.000000e+00 0s

solved in 16 iterations , 0.00 seconds optimal objective 9.908614362e-01 gurobi 5.5.0: optimal solution; objective 0.9908614362 16 simplex iterations

whats problem , cannt find 2 weeks. can test model right under small network data file. when test under larger network more nodes, occurs kind of problems shown above.


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