Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:08:39 2012 Optimize a model with 743 rows, 173 columns and 1486 nonzeros Presolve removed 165 rows and 2 columns Presolve time: 0.00s Presolved: 578 rows, 171 columns, 1248 nonzeros Variable types: 0 continuous, 171 integer (171 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 7.000000e+01, 393 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 70.00000 0 158 52.00000 70.00000 34.6% - 0s H 0 0 54.0000000 70.00000 29.6% - 0s 0 0 69.06250 0 169 54.00000 69.06250 27.9% - 0s 0 0 68.30200 0 168 54.00000 68.30200 26.5% - 0s 0 0 67.91950 0 167 54.00000 67.91950 25.8% - 0s 0 0 67.17126 0 168 54.00000 67.17126 24.4% - 0s H 0 0 55.0000000 67.17126 22.1% - 0s 0 0 66.94029 0 168 55.00000 66.94029 21.7% - 0s 0 0 66.73841 0 171 55.00000 66.73841 21.3% - 0s 0 0 66.49068 0 171 55.00000 66.49068 20.9% - 0s 0 0 66.34968 0 169 55.00000 66.34968 20.6% - 0s 0 0 66.16888 0 169 55.00000 66.16888 20.3% - 0s 0 0 66.06057 0 170 55.00000 66.06057 20.1% - 0s 0 0 65.91843 0 171 55.00000 65.91843 19.9% - 0s 0 0 65.87431 0 170 55.00000 65.87431 19.8% - 0s 0 0 65.75365 0 168 55.00000 65.75365 19.6% - 0s H 0 0 56.0000000 65.75365 17.4% - 0s 0 0 65.70169 0 170 56.00000 65.70169 17.3% - 0s 0 0 65.66305 0 170 56.00000 65.66305 17.3% - 0s 0 0 65.66305 0 170 56.00000 65.66305 17.3% - 0s 0 2 65.66154 0 170 56.00000 65.66154 17.3% - 0s H 354 147 57.0000000 63.86333 12.0% 45.8 0s 610 237 61.16667 8 170 57.00000 63.06572 10.6% 44.9 5s 1340 394 59.84615 24 131 57.00000 62.73878 10.1% 47.1 10s 4783 1121 58.88000 22 114 57.00000 60.39157 5.95% 33.5 15s Cutting planes: Gomory: 2 Zero half: 76 Explored 9924 nodes (277278 simplex iterations) in 19.52 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%