Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:28 2012 Optimize a model with 389 rows, 124 columns and 778 nonzeros Presolve removed 59 rows and 2 columns Presolve time: 0.00s Presolved: 330 rows, 122 columns, 689 nonzeros Variable types: 0 continuous, 122 integer (122 binary) Found heuristic solution: objective 42.0000000 Root relaxation: objective 5.512500e+01, 161 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 55.12500 0 107 42.00000 55.12500 31.2% - 0s 0 0 53.16667 0 117 42.00000 53.16667 26.6% - 0s 0 0 52.35937 0 120 42.00000 52.35937 24.7% - 0s H 0 0 44.0000000 52.35937 19.0% - 0s 0 0 51.87500 0 113 44.00000 51.87500 17.9% - 0s 0 0 51.58511 0 118 44.00000 51.58511 17.2% - 0s 0 0 51.21429 0 111 44.00000 51.21429 16.4% - 0s 0 0 51.00000 0 113 44.00000 51.00000 15.9% - 0s 0 0 50.86857 0 115 44.00000 50.86857 15.6% - 0s H 0 0 45.0000000 50.86857 13.0% - 0s 0 0 50.64639 0 116 45.00000 50.64639 12.5% - 0s 0 0 50.37500 0 114 45.00000 50.37500 11.9% - 0s 0 0 50.24302 0 115 45.00000 50.24302 11.7% - 0s 0 0 50.18310 0 115 45.00000 50.18310 11.5% - 0s 0 0 50.18310 0 114 45.00000 50.18310 11.5% - 0s H 0 0 46.0000000 50.18310 9.09% - 0s 0 2 50.18202 0 114 46.00000 50.18202 9.09% - 0s * 92 12 12 47.0000000 49.19298 4.67% 28.9 0s Cutting planes: Zero half: 128 Explored 142 nodes (5021 simplex iterations) in 0.21 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.700000000000e+01, best bound 4.700000000000e+01, gap 0.0%