Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:21 2012 Optimize a model with 323 rows, 118 columns and 646 nonzeros Presolve removed 61 rows and 4 columns Presolve time: 0.00s Presolved: 262 rows, 114 columns, 549 nonzeros Variable types: 0 continuous, 114 integer (114 binary) Found heuristic solution: objective 40.0000000 Root relaxation: objective 5.300000e+01, 138 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 53.00000 0 90 40.00000 53.00000 32.5% - 0s 0 0 51.50000 0 98 40.00000 51.50000 28.7% - 0s H 0 0 42.0000000 51.50000 22.6% - 0s 0 0 51.00000 0 108 42.00000 51.00000 21.4% - 0s 0 0 50.54545 0 113 42.00000 50.54545 20.3% - 0s 0 0 50.42308 0 110 42.00000 50.42308 20.1% - 0s H 0 0 43.0000000 50.42308 17.3% - 0s H 0 0 44.0000000 50.42308 14.6% - 0s 0 0 50.05263 0 108 44.00000 50.05263 13.8% - 0s 0 0 49.60465 0 111 44.00000 49.60465 12.7% - 0s 0 0 49.41573 0 114 44.00000 49.41573 12.3% - 0s 0 0 49.23529 0 112 44.00000 49.23529 11.9% - 0s 0 0 49.23404 0 114 44.00000 49.23404 11.9% - 0s 0 0 49.23404 0 113 44.00000 49.23404 11.9% - 0s H 0 0 46.0000000 49.23404 7.03% - 0s 0 2 49.23404 0 113 46.00000 49.23404 7.03% - 0s * 7 5 5 47.0000000 49.23404 4.75% 21.9 0s * 17 1 3 48.0000000 49.10000 2.29% 16.8 0s Cutting planes: Gomory: 1 Zero half: 44 Explored 21 nodes (1054 simplex iterations) in 0.06 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.800000000000e+01, best bound 4.800000000000e+01, gap 0.0%