Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:43:02 2012 Optimize a model with 628 rows, 160 columns and 1256 nonzeros Presolve removed 107 rows and 0 columns Presolve time: 0.00s Presolved: 521 rows, 160 columns, 1105 nonzeros Variable types: 0 continuous, 160 integer (160 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 6.675000e+01, 295 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.75000 0 138 48.00000 66.75000 39.1% - 0s H 0 0 49.0000000 66.75000 36.2% - 0s 0 0 65.46939 0 157 49.00000 65.46939 33.6% - 0s H 0 0 51.0000000 65.46939 28.4% - 0s 0 0 64.67714 0 157 51.00000 64.67714 26.8% - 0s 0 0 63.91555 0 157 51.00000 63.91555 25.3% - 0s H 0 0 52.0000000 63.91555 22.9% - 0s 0 0 63.49512 0 158 52.00000 63.49512 22.1% - 0s 0 0 63.20557 0 159 52.00000 63.20557 21.5% - 0s 0 0 62.93900 0 158 52.00000 62.93900 21.0% - 0s 0 0 62.39193 0 158 52.00000 62.39193 20.0% - 0s 0 0 62.26501 0 159 52.00000 62.26501 19.7% - 0s 0 0 62.16275 0 157 52.00000 62.16275 19.5% - 0s 0 0 62.05168 0 159 52.00000 62.05168 19.3% - 0s 0 0 61.95683 0 158 52.00000 61.95683 19.1% - 0s 0 0 61.84136 0 157 52.00000 61.84136 18.9% - 0s 0 0 61.74634 0 159 52.00000 61.74634 18.7% - 0s 0 0 61.72617 0 159 52.00000 61.72617 18.7% - 0s 0 0 61.72617 0 159 52.00000 61.72617 18.7% - 0s 0 2 61.72266 0 159 52.00000 61.72266 18.7% - 0s H 14 14 53.0000000 61.70788 16.4% 56.4 0s H 33 24 54.0000000 61.45917 13.8% 50.0 0s H 111 45 55.0000000 60.70363 10.4% 44.8 0s H 197 58 56.0000000 60.28285 7.65% 46.6 0s Cutting planes: Gomory: 1 Zero half: 197 Explored 730 nodes (33709 simplex iterations) in 1.49 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%