Gurobi 5.0.1 (linux64) logging started Tue Nov 20 13:20:46 2012 Optimize a model with 776 rows, 177 columns and 1552 nonzeros Presolve removed 160 rows and 2 columns Presolve time: 0.00s Presolved: 616 rows, 175 columns, 1334 nonzeros Variable types: 0 continuous, 175 integer (175 binary) Found heuristic solution: objective 51.0000000 Root relaxation: objective 7.150000e+01, 335 iterations, 0.01 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 71.50000 0 137 51.00000 71.50000 40.2% - 0s 0 0 70.54878 0 170 51.00000 70.54878 38.3% - 0s H 0 0 55.0000000 70.54878 28.3% - 0s 0 0 69.38606 0 171 55.00000 69.38606 26.2% - 0s 0 0 68.54784 0 173 55.00000 68.54784 24.6% - 0s 0 0 67.79947 0 172 55.00000 67.79947 23.3% - 0s H 0 0 56.0000000 67.79947 21.1% - 0s 0 0 67.51859 0 175 56.00000 67.51859 20.6% - 0s 0 0 67.36949 0 174 56.00000 67.36949 20.3% - 0s 0 0 67.17508 0 174 56.00000 67.17508 20.0% - 0s 0 0 67.03627 0 172 56.00000 67.03627 19.7% - 0s 0 0 67.00705 0 174 56.00000 67.00705 19.7% - 0s 0 0 67.00705 0 174 56.00000 67.00705 19.7% - 0s 0 2 67.00597 0 174 56.00000 67.00597 19.7% - 0s H 98 66 57.0000000 66.65487 16.9% 55.4 0s 617 327 64.37953 11 171 57.00000 64.37953 12.9% 48.4 5s H 804 382 58.0000000 64.37953 11.0% 55.1 5s 2815 1087 59.00000 27 111 58.00000 63.13793 8.86% 41.6 10s H 3687 1109 59.0000000 62.68627 6.25% 38.9 11s 6057 1160 60.16667 29 132 59.00000 61.69231 4.56% 36.1 15s Cutting planes: Gomory: 5 Zero half: 74 Explored 8751 nodes (287218 simplex iterations) in 17.94 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%