Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:47 2012 Optimize a model with 292 rows, 76 columns and 584 nonzeros Presolve removed 98 rows and 2 columns Presolve time: 0.00s Presolved: 194 rows, 74 columns, 462 nonzeros Variable types: 0 continuous, 74 integer (74 binary) Found heuristic solution: objective 23.0000000 Root relaxation: objective 2.942857e+01, 119 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 29.42857 0 70 23.00000 29.42857 28.0% - 0s H 0 0 24.0000000 29.42857 22.6% - 0s 0 0 29.13953 0 72 24.00000 29.13953 21.4% - 0s H 0 0 25.0000000 29.13953 16.6% - 0s 0 0 28.86101 0 73 25.00000 28.86101 15.4% - 0s H 0 0 27.0000000 28.86101 6.89% - 0s 0 0 28.75000 0 73 27.00000 28.75000 6.48% - 0s 0 0 28.70083 0 72 27.00000 28.70083 6.30% - 0s 0 0 28.60345 0 73 27.00000 28.60345 5.94% - 0s 0 0 28.48387 0 73 27.00000 28.48387 5.50% - 0s 0 0 28.46914 0 73 27.00000 28.46914 5.44% - 0s 0 0 28.43131 0 73 27.00000 28.43131 5.30% - 0s 0 0 28.39359 0 72 27.00000 28.39359 5.16% - 0s 0 0 28.33686 0 73 27.00000 28.33686 4.95% - 0s 0 0 28.31240 0 73 27.00000 28.31240 4.86% - 0s 0 0 28.30854 0 73 27.00000 28.30854 4.85% - 0s 0 0 28.30854 0 73 27.00000 28.30854 4.85% - 0s 0 2 28.30243 0 73 27.00000 28.30243 4.82% - 0s Cutting planes: Clique: 2 Zero half: 28 Explored 7 nodes (589 simplex iterations) in 0.05 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.700000000000e+01, best bound 2.700000000000e+01, gap 0.0%