Gurobi 5.0.1 (linux64) logging started Tue Nov 20 12:58:38 2012 Optimize a model with 709 rows, 169 columns and 1418 nonzeros Presolve removed 146 rows and 0 columns Presolve time: 0.00s Presolved: 563 rows, 169 columns, 1219 nonzeros Variable types: 0 continuous, 169 integer (169 binary) Found heuristic solution: objective 52.0000000 Root relaxation: objective 6.933333e+01, 328 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 69.33333 0 143 52.00000 69.33333 33.3% - 0s 0 0 68.12500 0 153 52.00000 68.12500 31.0% - 0s 0 0 67.33333 0 160 52.00000 67.33333 29.5% - 0s 0 0 66.13581 0 165 52.00000 66.13581 27.2% - 0s 0 0 65.33846 0 166 52.00000 65.33846 25.7% - 0s 0 0 64.87651 0 165 52.00000 64.87651 24.8% - 0s 0 0 64.62914 0 168 52.00000 64.62914 24.3% - 0s 0 0 64.44988 0 167 52.00000 64.44988 23.9% - 0s 0 0 64.26384 0 168 52.00000 64.26384 23.6% - 0s 0 0 64.13158 0 167 52.00000 64.13158 23.3% - 0s 0 0 63.99871 0 169 52.00000 63.99871 23.1% - 0s 0 0 63.92044 0 169 52.00000 63.92044 22.9% - 0s 0 0 63.83440 0 169 52.00000 63.83440 22.8% - 0s 0 0 63.81477 0 168 52.00000 63.81477 22.7% - 0s 0 0 63.74642 0 168 52.00000 63.74642 22.6% - 0s 0 0 63.65879 0 169 52.00000 63.65879 22.4% - 0s 0 0 63.64458 0 168 52.00000 63.64458 22.4% - 0s 0 0 63.61349 0 168 52.00000 63.61349 22.3% - 0s 0 0 63.61349 0 167 52.00000 63.61349 22.3% - 0s H 0 0 54.0000000 63.61349 17.8% - 0s 0 2 63.61341 0 167 54.00000 63.61341 17.8% - 0s * 28 22 23 55.0000000 63.61138 15.7% 37.0 0s * 146 66 11 56.0000000 62.71805 12.0% 48.2 0s H 308 81 57.0000000 61.85874 8.52% 44.3 0s 616 154 59.00000 20 167 57.00000 61.16812 7.31% 42.5 5s 630 165 61.16812 13 166 57.00000 61.16812 7.31% 46.8 10s Cutting planes: Clique: 1 Zero half: 234 Explored 2001 nodes (89656 simplex iterations) in 13.64 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.700000000000e+01, best bound 5.700000000000e+01, gap 0.0%