Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:12:32 2013 Optimize a model with 561 rows, 26061 columns and 52071 nonzeros Presolve time: 0.04s Presolved: 561 rows, 26061 columns, 52071 nonzeros Variable types: 26010 continuous, 51 integer (51 binary) Root relaxation: objective 5.482757e+04, 1140 iterations, 0.03 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 54827.5703 0 4 - 54827.5703 - - 0s H 0 0 56323.000000 54827.5703 2.66% - 0s 0 0 54995.0940 0 2 56323.0000 54995.0940 2.36% - 0s 0 0 55010.5029 0 2 56323.0000 55010.5029 2.33% - 0s 0 0 55011.6328 0 2 56323.0000 55011.6328 2.33% - 0s 0 0 55019.3822 0 2 56323.0000 55019.3822 2.31% - 0s 0 0 55022.1934 0 2 56323.0000 55022.1934 2.31% - 0s 0 0 55022.1934 0 2 56323.0000 55022.1934 2.31% - 0s 0 0 55024.3925 0 2 56323.0000 55024.3925 2.31% - 0s 0 0 55026.6209 0 2 56323.0000 55026.6209 2.30% - 0s 0 0 55027.7693 0 2 56323.0000 55027.7693 2.30% - 0s 0 0 55027.7693 0 2 56323.0000 55027.7693 2.30% - 0s 0 2 55032.4407 0 2 56323.0000 55032.4407 2.29% - 0s H 1 1 56125.098361 55032.4407 1.95% 0.0 0s H 3 3 55347.000000 55105.0000 0.44% 52.3 0s * 4 3 4 55172.000000 55105.0000 0.12% 44.8 0s Cutting planes: Implied bound: 52 Flow cover: 3 Explored 8 nodes (1617 simplex iterations) in 0.70 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.517200000000e+04, best bound 5.517200000000e+04, gap 0.0%