Gurobi 5.0.1 (linux64) logging started Fri Nov 16 13:31:13 2012 Optimize a model with 21680 rows, 5402 columns and 70078 nonzeros Presolve removed 2 rows and 2 columns Presolve time: 0.68s Presolved: 21751 rows, 5400 columns, 74813 nonzeros Variable types: 0 continuous, 5400 integer (5400 binary) Found heuristic solution: objective 73.0000000 Root relaxation: objective 2.000000e+00, 3955 iterations, 0.17 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 2.00000 0 146 73.00000 2.00000 97.3% - 1s H 0 0 5.0000000 2.00000 60.0% - 1s 0 0 3.00000 0 796 5.00000 3.00000 40.0% - 11s 0 0 3.00000 0 1377 5.00000 3.00000 40.0% - 14s 0 0 3.00709 0 4316 5.00000 3.00709 39.9% - 29s 0 0 3.00709 0 4311 5.00000 3.00709 39.9% - 32s 0 0 3.00709 0 4310 5.00000 3.00709 39.9% - 33s 0 0 3.00709 0 4310 5.00000 3.00709 39.9% - 44s 0 2 3.33333 0 4310 5.00000 3.33333 33.3% - 83s 22 12 cutoff 1 5.00000 4.00000 20.0% 1821 88s H 82 0 4.0000000 4.00000 0.0% 562 91s Cutting planes: Clique: 103 Zero half: 1 Explored 82 nodes (139910 simplex iterations) in 91.58 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%