Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:42 2012 Optimize a model with 221 rows, 66 columns and 442 nonzeros Presolve removed 61 rows and 2 columns Presolve time: 0.00s Presolved: 160 rows, 64 columns, 363 nonzeros Variable types: 0 continuous, 64 integer (64 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.687500e+01, 111 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 26.87500 0 49 21.00000 26.87500 28.0% - 0s H 0 0 22.0000000 26.87500 22.2% - 0s 0 0 26.00000 0 59 22.00000 26.00000 18.2% - 0s H 0 0 23.0000000 26.00000 13.0% - 0s H 0 0 24.0000000 26.00000 8.33% - 0s 0 0 26.00000 0 54 24.00000 26.00000 8.33% - 0s 0 0 25.87931 0 63 24.00000 25.87931 7.83% - 0s 0 0 25.66667 0 50 24.00000 25.66667 6.94% - 0s 0 0 25.55738 0 64 24.00000 25.55738 6.49% - 0s 0 0 25.50400 0 64 24.00000 25.50400 6.27% - 0s 0 0 25.44667 0 62 24.00000 25.44667 6.03% - 0s 0 0 25.42092 0 64 24.00000 25.42092 5.92% - 0s 0 0 25.39394 0 61 24.00000 25.39394 5.81% - 0s 0 0 25.36607 0 64 24.00000 25.36607 5.69% - 0s 0 0 25.36508 0 61 24.00000 25.36508 5.69% - 0s 0 0 25.36451 0 63 24.00000 25.36451 5.69% - 0s 0 0 25.36451 0 62 24.00000 25.36451 5.69% - 0s 0 2 25.36190 0 62 24.00000 25.36190 5.67% - 0s Cutting planes: Zero half: 31 Explored 13 nodes (587 simplex iterations) in 0.04 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.400000000000e+01, best bound 2.400000000000e+01, gap 0.0%