Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:52:35 2012 Optimize a model with 692 rows, 166 columns and 1384 nonzeros Presolve removed 119 rows and 0 columns Presolve time: 0.00s Presolved: 573 rows, 166 columns, 1224 nonzeros Variable types: 0 continuous, 166 integer (166 binary) Found heuristic solution: objective 47.0000000 Root relaxation: objective 6.900000e+01, 310 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69.00000 0 138 47.00000 69.00000 46.8% - 0s 0 0 67.88043 0 162 47.00000 67.88043 44.4% - 0s H 0 0 48.0000000 67.88043 41.4% - 0s 0 0 66.38376 0 162 48.00000 66.38376 38.3% - 0s 0 0 65.57036 0 164 48.00000 65.57036 36.6% - 0s H 0 0 52.0000000 65.57036 26.1% - 0s 0 0 65.12677 0 164 52.00000 65.12677 25.2% - 0s 0 0 64.82027 0 164 52.00000 64.82027 24.7% - 0s 0 0 64.57378 0 166 52.00000 64.57378 24.2% - 0s 0 0 64.23195 0 164 52.00000 64.23195 23.5% - 0s 0 0 64.08749 0 163 52.00000 64.08749 23.2% - 0s 0 0 63.78781 0 162 52.00000 63.78781 22.7% - 0s 0 0 63.70197 0 164 52.00000 63.70197 22.5% - 0s 0 0 63.60490 0 164 52.00000 63.60490 22.3% - 0s 0 0 63.55364 0 165 52.00000 63.55364 22.2% - 0s 0 0 63.55364 0 164 52.00000 63.55364 22.2% - 0s 0 2 63.55262 0 164 52.00000 63.55262 22.2% - 0s H 54 37 53.0000000 63.17227 19.2% 48.2 0s H 66 41 54.0000000 63.16603 17.0% 50.2 0s * 69 31 13 56.0000000 63.16603 12.8% 49.8 0s 614 159 60.25794 16 162 56.00000 60.62025 8.25% 47.5 5s 625 166 57.84211 22 163 56.00000 60.62025 8.25% 46.7 10s 641 179 60.62025 15 165 56.00000 60.62025 8.25% 51.7 15s 1871 301 cutoff 28 56.00000 58.91454 5.20% 52.8 20s Cutting planes: Clique: 1 Zero half: 249 Explored 2923 nodes (137933 simplex iterations) in 22.73 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.600000000000e+01, best bound 5.600000000000e+01, gap 0.0%