Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:50 2012 Optimize a model with 300 rows, 81 columns and 600 nonzeros Presolve removed 79 rows and 0 columns Presolve time: 0.00s Presolved: 221 rows, 81 columns, 501 nonzeros Variable types: 0 continuous, 81 integer (81 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 3.250000e+01, 148 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 32.50000 0 74 26.00000 32.50000 25.0% - 0s H 0 0 28.0000000 32.50000 16.1% - 0s 0 0 31.88889 0 78 28.00000 31.88889 13.9% - 0s H 0 0 29.0000000 31.88889 10.0% - 0s 0 0 31.68852 0 77 29.00000 31.68852 9.27% - 0s 0 0 31.34783 0 75 29.00000 31.34783 8.10% - 0s 0 0 31.26116 0 75 29.00000 31.26116 7.80% - 0s 0 0 31.03846 0 78 29.00000 31.03846 7.03% - 0s 0 0 30.79798 0 77 29.00000 30.79798 6.20% - 0s 0 0 30.71429 0 75 29.00000 30.71429 5.91% - 0s 0 0 30.67347 0 78 29.00000 30.67347 5.77% - 0s 0 0 30.66667 0 77 29.00000 30.66667 5.75% - 0s 0 0 30.63158 0 79 29.00000 30.63158 5.63% - 0s 0 0 30.61702 0 77 29.00000 30.61702 5.58% - 0s 0 0 30.58772 0 79 29.00000 30.58772 5.47% - 0s 0 0 30.56467 0 80 29.00000 30.56467 5.40% - 0s 0 0 30.55860 0 80 29.00000 30.55860 5.37% - 0s 0 0 30.55860 0 80 29.00000 30.55860 5.37% - 0s 0 2 30.55860 0 80 29.00000 30.55860 5.37% - 0s Cutting planes: Zero half: 30 Explored 13 nodes (774 simplex iterations) in 0.06 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.900000000000e+01, best bound 2.900000000000e+01, gap 0.0%