Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:38:46 2012 Optimize a model with 664 rows, 156 columns and 1328 nonzeros Presolve removed 139 rows and 0 columns Presolve time: 0.00s Presolved: 525 rows, 156 columns, 1152 nonzeros Variable types: 0 continuous, 156 integer (156 binary) Found heuristic solution: objective 43.0000000 Root relaxation: objective 6.400000e+01, 308 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 64.00000 0 122 43.00000 64.00000 48.8% - 0s H 0 0 44.0000000 64.00000 45.5% - 0s H 0 0 45.0000000 64.00000 42.2% - 0s 0 0 62.62791 0 147 45.00000 62.62791 39.2% - 0s 0 0 61.84035 0 154 45.00000 61.84035 37.4% - 0s H 0 0 48.0000000 61.84035 28.8% - 0s 0 0 61.17314 0 152 48.00000 61.17314 27.4% - 0s 0 0 60.76052 0 153 48.00000 60.76052 26.6% - 0s H 0 0 49.0000000 60.76052 24.0% - 0s 0 0 60.39053 0 155 49.00000 60.39053 23.2% - 0s 0 0 60.14074 0 155 49.00000 60.14074 22.7% - 0s 0 0 60.01125 0 156 49.00000 60.01125 22.5% - 0s H 0 0 50.0000000 60.01125 20.0% - 0s 0 0 59.95528 0 156 50.00000 59.95528 19.9% - 0s 0 0 59.82553 0 156 50.00000 59.82553 19.7% - 0s 0 0 59.77886 0 155 50.00000 59.77886 19.6% - 0s 0 0 59.67569 0 156 50.00000 59.67569 19.4% - 0s 0 0 59.64896 0 155 50.00000 59.64896 19.3% - 0s 0 0 59.63377 0 155 50.00000 59.63377 19.3% - 0s 0 0 59.63377 0 155 50.00000 59.63377 19.3% - 0s 0 2 59.63197 0 155 50.00000 59.63197 19.3% - 0s * 73 40 23 51.0000000 59.20253 16.1% 42.2 0s * 872 314 33 52.0000000 56.78112 9.19% 44.4 4s 1144 317 cutoff 30 52.00000 56.75000 9.13% 41.5 5s Cutting planes: Gomory: 4 Zero half: 62 Explored 3728 nodes (108607 simplex iterations) in 7.95 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.200000000000e+01, best bound 5.200000000000e+01, gap 0.0%