Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:50:51 2012 Optimize a model with 608 rows, 111 columns and 1216 nonzeros Presolve removed 225 rows and 0 columns Presolve time: 0.00s Presolved: 383 rows, 111 columns, 966 nonzeros Variable types: 0 continuous, 111 integer (111 binary) Found heuristic solution: objective 28.0000000 Root relaxation: objective 3.912500e+01, 257 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.12500 0 105 28.00000 39.12500 39.7% - 0s H 0 0 31.0000000 39.12500 26.2% - 0s 0 0 38.79210 0 106 31.00000 38.79210 25.1% - 0s 0 0 38.66919 0 105 31.00000 38.66919 24.7% - 0s 0 0 38.50328 0 109 31.00000 38.50328 24.2% - 0s 0 0 38.41261 0 108 31.00000 38.41261 23.9% - 0s 0 0 38.34299 0 109 31.00000 38.34299 23.7% - 0s 0 0 38.31019 0 108 31.00000 38.31019 23.6% - 0s 0 0 38.26306 0 110 31.00000 38.26306 23.4% - 0s 0 0 38.22154 0 110 31.00000 38.22154 23.3% - 0s 0 0 38.16258 0 107 31.00000 38.16258 23.1% - 0s 0 0 38.04008 0 110 31.00000 38.04008 22.7% - 0s 0 0 38.01055 0 109 31.00000 38.01055 22.6% - 0s 0 0 37.94108 0 111 31.00000 37.94108 22.4% - 0s H 0 0 32.0000000 37.94108 18.6% - 0s 0 0 37.91023 0 111 32.00000 37.91023 18.5% - 0s 0 0 37.88863 0 111 32.00000 37.88863 18.4% - 0s 0 0 37.83540 0 110 32.00000 37.83540 18.2% - 0s 0 0 37.75682 0 111 32.00000 37.75682 18.0% - 0s 0 0 37.74285 0 111 32.00000 37.74285 17.9% - 0s 0 0 37.74285 0 109 32.00000 37.74285 17.9% - 0s 0 2 37.74102 0 109 32.00000 37.74102 17.9% - 0s H 35 11 34.0000000 37.03922 8.94% 37.8 0s Cutting planes: Clique: 2 Zero half: 49 Explored 115 nodes (4675 simplex iterations) in 0.28 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.400000000000e+01, best bound 3.400000000000e+01, gap 0.0%