Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:32:43 2012 Optimize a model with 407 rows, 132 columns and 814 nonzeros Presolve removed 68 rows and 4 columns Presolve time: 0.00s Presolved: 339 rows, 128 columns, 711 nonzeros Variable types: 0 continuous, 128 integer (128 binary) Found heuristic solution: objective 48.0000000 Root relaxation: objective 5.900000e+01, 186 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 59.00000 0 94 48.00000 59.00000 22.9% - 0s 0 0 57.37500 0 103 48.00000 57.37500 19.5% - 0s H 0 0 49.0000000 57.37500 17.1% - 0s 0 0 56.66667 0 112 49.00000 56.66667 15.6% - 0s H 0 0 51.0000000 56.66667 11.1% - 0s 0 0 55.89189 0 120 51.00000 55.89189 9.59% - 0s 0 0 55.42647 0 122 51.00000 55.42647 8.68% - 0s 0 0 55.28090 0 124 51.00000 55.28090 8.39% - 0s 0 0 55.11679 0 117 51.00000 55.11679 8.07% - 0s 0 0 55.02083 0 116 51.00000 55.02083 7.88% - 0s 0 0 54.88189 0 124 51.00000 54.88189 7.61% - 0s 0 0 54.81667 0 121 51.00000 54.81667 7.48% - 0s H 0 0 52.0000000 54.81667 5.42% - 0s H 0 0 53.0000000 54.81667 3.43% - 0s 0 0 54.77575 0 125 53.00000 54.77575 3.35% - 0s 0 0 54.77575 0 109 53.00000 54.77575 3.35% - 0s 0 2 54.77575 0 108 53.00000 54.77575 3.35% - 0s Cutting planes: Gomory: 2 Zero half: 63 Explored 29 nodes (1531 simplex iterations) in 0.09 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.300000000000e+01, best bound 5.300000000000e+01, gap 0.0%