Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:44 2012 Optimize a model with 253 rows, 72 columns and 506 nonzeros Presolve removed 62 rows and 0 columns Presolve time: 0.00s Presolved: 191 rows, 72 columns, 431 nonzeros Variable types: 0 continuous, 72 integer (72 binary) Found heuristic solution: objective 21.0000000 Root relaxation: objective 2.900000e+01, 92 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 29.00000 0 54 21.00000 29.00000 38.1% - 0s H 0 0 25.0000000 29.00000 16.0% - 0s 0 0 28.44444 0 65 25.00000 28.44444 13.8% - 0s H 0 0 26.0000000 28.44444 9.40% - 0s 0 0 27.75000 0 49 26.00000 27.75000 6.73% - 0s 0 0 27.73077 0 66 26.00000 27.73077 6.66% - 0s 0 0 27.66667 0 58 26.00000 27.66667 6.41% - 0s 0 0 27.61163 0 71 26.00000 27.61163 6.20% - 0s 0 0 27.48148 0 71 26.00000 27.48148 5.70% - 0s 0 0 27.45161 0 67 26.00000 27.45161 5.58% - 0s 0 0 27.36364 0 65 26.00000 27.36364 5.24% - 0s 0 0 27.33333 0 60 26.00000 27.33333 5.13% - 0s 0 0 27.27108 0 67 26.00000 27.27108 4.89% - 0s 0 0 27.16234 0 66 26.00000 27.16234 4.47% - 0s 0 0 27.11111 0 68 26.00000 27.11111 4.27% - 0s 0 0 27.08621 0 64 26.00000 27.08621 4.18% - 0s 0 0 cutoff 0 26.00000 26.99997 3.85% - 0s Cutting planes: Clique: 1 Zero half: 38 Explored 0 nodes (435 simplex iterations) in 0.03 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0%