Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:43:54 2013 Optimize a model with 420 rows, 4260 columns and 8800 nonzeros Presolve removed 40 rows and 40 columns Presolve time: 0.02s Presolved: 380 rows, 4220 columns, 8660 nonzeros Variable types: 4140 continuous, 80 integer (80 binary) Root relaxation: objective 3.860476e+04, 474 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 38604.7615 0 3 - 38604.7615 - - 0s 0 0 38670.9691 0 3 - 38670.9691 - - 0s 0 0 38689.1181 0 3 - 38689.1181 - - 0s 0 0 38690.7671 0 3 - 38690.7671 - - 0s 0 0 38693.9328 0 3 - 38693.9328 - - 0s 0 0 38697.2398 0 3 - 38697.2398 - - 0s 0 0 38697.4857 0 3 - 38697.4857 - - 0s 0 0 38706.3055 0 3 - 38706.3055 - - 0s 0 0 38710.1177 0 3 - 38710.1177 - - 0s 0 0 38710.1646 0 3 - 38710.1646 - - 0s 0 0 38711.1672 0 3 - 38711.1672 - - 0s 0 0 38711.5215 0 3 - 38711.5215 - - 0s 0 0 38711.6757 0 3 - 38711.6757 - - 0s 0 0 38711.6757 0 3 - 38711.6757 - - 0s H 0 0 39080.807514 38711.6757 0.94% - 0s 0 2 38720.1380 0 3 39080.8075 38720.1380 0.92% - 0s * 7 4 5 38858.752096 38851.1992 0.02% 21.7 0s Cutting planes: Flow cover: 14 Explored 11 nodes (907 simplex iterations) in 0.23 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.885875209612e+04, best bound 3.885565987722e+04, gap 0.0080%