Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:24:53 2012 Optimize a model with 788 rows, 178 columns and 1576 nonzeros Presolve removed 156 rows and 0 columns Presolve time: 0.00s Presolved: 632 rows, 178 columns, 1369 nonzeros Variable types: 0 continuous, 178 integer (178 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 7.125000e+01, 302 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 71.25000 0 149 47.00000 71.25000 51.6% - 0s 0 0 70.40260 0 172 47.00000 70.40260 49.8% - 0s H 0 0 51.0000000 70.40260 38.0% - 0s 0 0 69.32096 0 175 51.00000 69.32096 35.9% - 0s 0 0 68.39745 0 175 51.00000 68.39745 34.1% - 0s 0 0 67.89054 0 175 51.00000 67.89054 33.1% - 0s 0 0 67.59598 0 174 51.00000 67.59598 32.5% - 0s 0 0 67.12749 0 174 51.00000 67.12749 31.6% - 0s 0 0 66.96048 0 175 51.00000 66.96048 31.3% - 0s 0 0 66.89921 0 177 51.00000 66.89921 31.2% - 0s 0 0 66.73431 0 177 51.00000 66.73431 30.9% - 0s H 0 0 52.0000000 66.73431 28.3% - 0s 0 0 66.63506 0 175 52.00000 66.63506 28.1% - 0s H 0 0 54.0000000 66.63506 23.4% - 0s 0 0 66.49008 0 175 54.00000 66.49008 23.1% - 0s 0 0 66.42318 0 177 54.00000 66.42318 23.0% - 0s 0 0 66.36989 0 176 54.00000 66.36989 22.9% - 0s 0 0 66.35476 0 177 54.00000 66.35476 22.9% - 0s 0 0 66.35476 0 176 54.00000 66.35476 22.9% - 0s H 0 0 55.0000000 66.35476 20.6% - 0s 0 2 66.35158 0 176 55.00000 66.35158 20.6% - 0s * 100 56 20 56.0000000 65.64035 17.2% 48.4 0s 610 321 59.00000 16 175 56.00000 63.59274 13.6% 47.3 5s 635 340 63.59274 21 165 56.00000 63.59274 13.6% 52.5 10s H 1500 474 57.0000000 62.95000 10.4% 51.7 12s 2260 740 59.48837 35 144 57.00000 62.00787 8.79% 49.0 15s 4317 1216 58.27273 38 127 57.00000 60.86207 6.78% 43.4 20s * 5146 930 34 58.0000000 60.57143 4.43% 41.9 22s Cutting planes: Gomory: 4 Zero half: 235 Explored 6825 nodes (264988 simplex iterations) in 24.97 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%