Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:36:27 2012 Optimize a model with 857 rows, 181 columns and 1714 nonzeros Presolve removed 176 rows and 0 columns Presolve time: 0.01s Presolved: 681 rows, 181 columns, 1481 nonzeros Variable types: 0 continuous, 181 integer (181 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 7.166667e+01, 320 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 71.66667 0 156 51.00000 71.66667 40.5% - 0s 0 0 70.68750 0 162 51.00000 70.68750 38.6% - 0s 0 0 70.18818 0 179 51.00000 70.18818 37.6% - 0s 0 0 69.03994 0 180 51.00000 69.03994 35.4% - 0s 0 0 68.68672 0 179 51.00000 68.68672 34.7% - 0s H 0 0 52.0000000 68.68672 32.1% - 0s 0 0 68.37322 0 179 52.00000 68.37322 31.5% - 0s 0 0 67.91870 0 177 52.00000 67.91870 30.6% - 0s 0 0 67.65779 0 176 52.00000 67.65779 30.1% - 0s 0 0 67.49890 0 177 52.00000 67.49890 29.8% - 0s 0 0 67.37464 0 179 52.00000 67.37464 29.6% - 0s H 0 0 54.0000000 67.37464 24.8% - 0s 0 0 67.23467 0 178 54.00000 67.23467 24.5% - 0s H 0 0 55.0000000 67.23467 22.2% - 0s 0 0 67.17444 0 179 55.00000 67.17444 22.1% - 0s 0 0 67.08210 0 177 55.00000 67.08210 22.0% - 0s 0 0 66.97707 0 180 55.00000 66.97707 21.8% - 0s 0 0 66.90789 0 180 55.00000 66.90789 21.7% - 0s 0 0 66.76906 0 177 55.00000 66.76906 21.4% - 0s 0 0 66.69495 0 177 55.00000 66.69495 21.3% - 0s 0 0 66.68590 0 178 55.00000 66.68590 21.2% - 0s 0 0 66.68590 0 177 55.00000 66.68590 21.2% - 0s 0 2 66.68032 0 176 55.00000 66.68032 21.2% - 0s H 27 17 56.0000000 66.40123 18.6% 77.4 0s H 303 141 57.0000000 64.76450 13.6% 52.8 0s 718 355 cutoff 27 57.00000 64.14621 12.5% 59.9 5s 2979 1238 58.96591 33 131 57.00000 62.48227 9.62% 43.1 10s H 3492 1151 58.0000000 62.16667 7.18% 41.1 10s 6153 1249 59.92308 29 127 58.00000 60.87500 4.96% 37.1 15s Cutting planes: Gomory: 8 Zero half: 83 Explored 8647 nodes (295484 simplex iterations) in 18.27 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.800000000000e+01, best bound 5.800000000000e+01, gap 0.0%