Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:51:23 2012 Optimize a model with 636 rows, 113 columns and 1272 nonzeros Presolve removed 232 rows and 0 columns Presolve time: 0.00s Presolved: 404 rows, 113 columns, 1021 nonzeros Variable types: 0 continuous, 113 integer (113 binary) Found heuristic solution: objective 29.0000000 Root relaxation: objective 3.965429e+01, 264 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 39.65429 0 111 29.00000 39.65429 36.7% - 0s H 0 0 30.0000000 39.65429 32.2% - 0s 0 0 39.16259 0 113 30.00000 39.16259 30.5% - 0s 0 0 38.80709 0 113 30.00000 38.80709 29.4% - 0s 0 0 38.54100 0 112 30.00000 38.54100 28.5% - 0s 0 0 38.42559 0 112 30.00000 38.42559 28.1% - 0s H 0 0 32.0000000 38.42559 20.1% - 0s 0 0 38.26980 0 113 32.00000 38.26980 19.6% - 0s 0 0 38.14548 0 111 32.00000 38.14548 19.2% - 0s 0 0 38.00478 0 113 32.00000 38.00478 18.8% - 0s 0 0 37.93053 0 112 32.00000 37.93053 18.5% - 0s 0 0 37.85051 0 112 32.00000 37.85051 18.3% - 0s 0 0 37.81314 0 112 32.00000 37.81314 18.2% - 0s 0 0 37.78441 0 111 32.00000 37.78441 18.1% - 0s 0 0 37.75407 0 112 32.00000 37.75407 18.0% - 0s 0 0 37.72669 0 112 32.00000 37.72669 17.9% - 0s 0 0 37.71876 0 112 32.00000 37.71876 17.9% - 0s 0 0 37.71876 0 111 32.00000 37.71876 17.9% - 0s 0 2 37.71833 0 111 32.00000 37.71833 17.9% - 0s Cutting planes: Clique: 2 Zero half: 71 Explored 746 nodes (23786 simplex iterations) in 0.92 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 3.200000000000e+01, best bound 3.200000000000e+01, gap 0.0%