Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:37:19 2013 Optimize a model with 54093 rows, 53363 columns and 213233 nonzeros Presolve removed 3017 rows and 0 columns Presolve time: 0.33s Presolved: 51076 rows, 53363 columns, 207199 nonzeros Variable types: 53290 continuous, 73 integer (73 binary) Root relaxation: objective 7.825918e+04, 11309 iterations, 2.14 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 78259.1823 0 6 - 78259.1823 - - 2s H 0 0 79582.000000 78259.1823 1.66% - 2s H 0 0 78489.000000 78259.1823 0.29% - 3s 0 0 78260.8325 0 8 78489.0000 78260.8325 0.29% - 3s 0 0 78260.8325 0 6 78489.0000 78260.8325 0.29% - 5s 0 0 78260.8361 0 8 78489.0000 78260.8361 0.29% - 5s 0 0 78261.2913 0 8 78489.0000 78261.2913 0.29% - 5s 0 0 78261.2913 0 8 78489.0000 78261.2913 0.29% - 5s 0 0 78298.4364 0 6 78489.0000 78298.4364 0.24% - 6s 0 2 78298.9773 0 6 78489.0000 78298.9773 0.24% - 6s * 7 5 7 78451.000000 78337.4988 0.14% 58.6 6s Cutting planes: Flow cover: 9 Explored 14 nodes (17211 simplex iterations) in 6.99 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 7.845100000000e+04, best bound 7.845100000000e+04, gap 0.0%