Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:37:09 2013 Optimize a model with 671 rows, 37271 columns and 74481 nonzeros Presolve time: 0.05s Presolved: 671 rows, 37271 columns, 74481 nonzeros Variable types: 37210 continuous, 61 integer (61 binary) Root relaxation: objective 7.331281e+04, 1793 iterations, 0.05 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 73312.8148 0 6 - 73312.8148 - - 0s H 0 0 75458.000000 73312.8148 2.84% - 0s H 0 0 75301.000000 73312.8148 2.64% - 0s H 0 0 73833.000000 73312.8148 0.70% - 0s 0 0 73640.2951 0 4 73833.0000 73640.2951 0.26% - 0s 0 0 73653.1641 0 3 73833.0000 73653.1641 0.24% - 0s 0 0 73657.4115 0 4 73833.0000 73657.4115 0.24% - 0s 0 0 73657.4344 0 3 73833.0000 73657.4344 0.24% - 0s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 6 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 4 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 0s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 1s 0 0 73657.4633 0 3 73833.0000 73657.4633 0.24% - 1s 0 2 73669.6939 0 3 73833.0000 73669.6939 0.22% - 1s * 9 4 8 73797.000000 73745.0971 0.07% 33.0 1s Cutting planes: Implied bound: 74 Flow cover: 8 Explored 13 nodes (4071 simplex iterations) in 1.38 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.379700000000e+04, best bound 7.379564229832e+04, gap 0.0018%