Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:35:25 2012 Optimize a model with 554 rows, 149 columns and 1108 nonzeros Presolve removed 110 rows and 2 columns Presolve time: 0.00s Presolved: 444 rows, 147 columns, 947 nonzeros Variable types: 0 continuous, 147 integer (147 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.150000e+01, 222 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 61.50000 0 113 47.00000 61.50000 30.9% - 0s 0 0 60.50000 0 126 47.00000 60.50000 28.7% - 0s 0 0 60.22472 0 142 47.00000 60.22472 28.1% - 0s 0 0 59.63038 0 145 47.00000 59.63038 26.9% - 0s 0 0 59.07692 0 143 47.00000 59.07692 25.7% - 0s H 0 0 49.0000000 59.07692 20.6% - 0s 0 0 58.88053 0 144 49.00000 58.88053 20.2% - 0s 0 0 58.55983 0 144 49.00000 58.55983 19.5% - 0s 0 0 58.39271 0 144 49.00000 58.39271 19.2% - 0s H 0 0 50.0000000 58.39271 16.8% - 0s 0 0 58.28541 0 145 50.00000 58.28541 16.6% - 0s 0 0 58.20118 0 144 50.00000 58.20118 16.4% - 0s 0 0 58.04236 0 145 50.00000 58.04236 16.1% - 0s 0 0 57.96025 0 146 50.00000 57.96025 15.9% - 0s 0 0 57.80132 0 146 50.00000 57.80132 15.6% - 0s 0 0 57.77559 0 146 50.00000 57.77559 15.6% - 0s 0 0 57.77559 0 145 50.00000 57.77559 15.6% - 0s 0 2 57.77559 0 145 50.00000 57.77559 15.6% - 0s * 15 15 11 52.0000000 57.77559 11.1% 37.3 0s H 55 17 53.0000000 57.29727 8.11% 37.1 0s Cutting planes: Clique: 1 Zero half: 155 Explored 344 nodes (14694 simplex iterations) in 0.63 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%