Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:49:37 2012 Optimize a model with 712 rows, 164 columns and 1424 nonzeros Presolve removed 163 rows and 0 columns Presolve time: 0.00s Presolved: 549 rows, 164 columns, 1210 nonzeros Variable types: 0 continuous, 164 integer (164 binary) Found heuristic solution: objective 49.0000000 Root relaxation: objective 6.657143e+01, 339 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 66.57143 0 155 49.00000 66.57143 35.9% - 0s H 0 0 51.0000000 66.57143 30.5% - 0s 0 0 64.97479 0 163 51.00000 64.97479 27.4% - 0s 0 0 64.16667 0 163 51.00000 64.16667 25.8% - 0s 0 0 63.99623 0 164 51.00000 63.99623 25.5% - 0s 0 0 63.66846 0 162 51.00000 63.66846 24.8% - 0s H 0 0 52.0000000 63.66846 22.4% - 0s 0 0 63.33759 0 163 52.00000 63.33759 21.8% - 0s 0 0 63.08873 0 162 52.00000 63.08873 21.3% - 0s 0 0 62.91862 0 161 52.00000 62.91862 21.0% - 0s 0 0 62.88089 0 161 52.00000 62.88089 20.9% - 0s 0 0 62.82841 0 161 52.00000 62.82841 20.8% - 0s 0 0 62.76268 0 163 52.00000 62.76268 20.7% - 0s 0 0 62.64225 0 164 52.00000 62.64225 20.5% - 0s 0 0 62.51472 0 164 52.00000 62.51472 20.2% - 0s 0 0 62.47210 0 164 52.00000 62.47210 20.1% - 0s 0 0 62.47210 0 164 52.00000 62.47210 20.1% - 0s 0 2 62.46878 0 164 52.00000 62.46878 20.1% - 0s H 27 23 53.0000000 62.40942 17.8% 41.5 0s H 94 48 54.0000000 61.74383 14.3% 52.5 0s 611 231 58.04026 7 164 54.00000 59.84508 10.8% 40.2 5s 678 277 56.05128 40 129 54.00000 59.84508 10.8% 47.1 10s H 1931 460 55.0000000 58.73585 6.79% 41.4 13s 2911 480 56.08108 24 122 55.00000 57.66667 4.85% 39.0 15s Cutting planes: Gomory: 1 Zero half: 172 Explored 3888 nodes (141839 simplex iterations) in 16.43 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.500000000000e+01, best bound 5.500000000000e+01, gap 0.0%