Gurobi 5.0.1 (linux64) logging started Fri Nov 16 11:37:22 2012 Optimize a model with 17639 rows, 4970 columns and 57538 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.59s Presolved: 17707 rows, 4968 columns, 61934 nonzeros Variable types: 0 continuous, 4968 integer (4968 binary) Found heuristic solution: objective 70.0000000 Root relaxation: objective 2.000000e+00, 3571 iterations, 0.15 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 140 70.00000 2.00000 97.1% - 1s H 0 0 69.0000000 2.00000 97.1% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 3.00000 0 1283 5.00000 3.00000 40.0% - 12s 0 0 3.00000 0 1377 5.00000 3.00000 40.0% - 13s 0 0 3.00000 0 2745 5.00000 3.00000 40.0% - 24s 0 0 3.00000 0 2731 5.00000 3.00000 40.0% - 32s H 0 0 4.0000000 3.00000 25.0% - 33s 0 0 infeasible 0 4.00000 3.00001 25.0% - 34s Cutting planes: Clique: 74 Zero half: 9 Explored 0 nodes (89747 simplex iterations) in 34.57 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 4.000000000000e+00, best bound 4.000000000000e+00, gap 0.0%