Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:47 2012 Optimize a model with 301 rows, 77 columns and 602 nonzeros Presolve removed 99 rows and 0 columns Presolve time: 0.00s Presolved: 202 rows, 77 columns, 490 nonzeros Variable types: 0 continuous, 77 integer (77 binary) Found heuristic solution: objective 26.0000000 Root relaxation: objective 2.978571e+01, 122 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 29.78571 0 71 26.00000 29.78571 14.6% - 0s H 0 0 27.0000000 29.78571 10.3% - 0s 0 0 29.00000 0 51 27.00000 29.00000 7.41% - 0s 0 0 29.00000 0 61 27.00000 29.00000 7.41% - 0s 0 0 29.00000 0 42 27.00000 29.00000 7.41% - 0s 0 0 28.95434 0 72 27.00000 28.95434 7.24% - 0s 0 0 28.86550 0 72 27.00000 28.86550 6.91% - 0s 0 0 28.72422 0 72 27.00000 28.72422 6.39% - 0s 0 0 28.68657 0 72 27.00000 28.68657 6.25% - 0s 0 0 28.63915 0 69 27.00000 28.63915 6.07% - 0s 0 0 28.58621 0 72 27.00000 28.58621 5.87% - 0s 0 0 28.54074 0 72 27.00000 28.54074 5.71% - 0s 0 0 28.50206 0 72 27.00000 28.50206 5.56% - 0s 0 0 28.47826 0 73 27.00000 28.47826 5.48% - 0s 0 0 28.44474 0 70 27.00000 28.44474 5.35% - 0s 0 0 28.43284 0 71 27.00000 28.43284 5.31% - 0s 0 0 28.43284 0 70 27.00000 28.43284 5.31% - 0s 0 2 28.43284 0 70 27.00000 28.43284 5.31% - 0s Cutting planes: Zero half: 22 Explored 9 nodes (721 simplex iterations) in 0.06 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%